Bundles Finance (BUND) - Updated Smart Contract Audit Report

Summary

Bundles Finance Bundles allows token holders to use their Crypto prediction skills to choose which cryptocurrencies will perform best over the following 6 days. Out of 10 popular cryptocurrencies, $BUND token holders can choose to stake their tokens on a single asset or a ‘Bundle’ of assets to achieve the highest returns during the staking period. Depending upon the performance of your $BUND tokens staked in relation to the other $BUND tokens staked over the 6 day period, you will either increase or decrease your token holdings.

Note: This is the second audit we have completed for the Bundles team. For this audit we confirmed our prior findings on Bundles' token contracts and analyzed the team's liquidty pool and updated staking contracts. This audit arose after the dev team introduced potentially malicious code into the prior staking contracts after our first audit was complete (details on what happened here). Users should unstake from the old pools and move their tokens to the new pools. At the time of writing this, ~1.5k USD of value remains in the vulnerable contracts, and no malicious actions have been taken or funds lost.

Verified Contracts:
  • BUND Token - 0x8d3e855f3f55109d473735ab76f753218400fe96
  • BUND + ETH LP Pool - 0x44ef4b1dc8f566350f3cCD5C83c21743151fb98D
  • Updated Low-Risk Pool Contract - 0xd1064084f27c1b2c5991f3acc13be8f9916b08cd
  • Updated High-Risk Pool Contract - 0x4424682d61bd5d489e202bf242d57f5de09a68b4

  • There are 3 differences between the high and low risk pools:
  • The high risk pool allows users to win/lose up to 40% as opposed to 4% on the low-risk pool. The team controls the system that determines winners; calculate your personal risk tolerance accordingly. The team is public and appears trustworthy.
  • The high risk pool's developer fee is 1% of BUND winnings as opposed to 10% in the low risk pool.
  • The high risk pool allows the team to create new bundles after 2 days, as opposed to 3..

  • Audit Findings:
    • Summary: No issues from outside attackers were identified.
    • Ensure trust in the project team. If the team acts maliciously the code restricts them from misappropriating more than 4% of user's staked funds in the low-risk pool and 40% in the high-risk pool.
    • Date: December 5th, 2020.

    • The BUND token contract is secure and cannot be minted after deployment.
    • Bundles' development team previously added a drain() function after our audit was complete without informing us. We alterted the community and subsequently helped the team to update their contracts to make them safe. Verify the contracts to be invested in are the same as those verified by our team above.

    • The logic that manages the ecosystem is run on an off-chain NodeJS server hosted on AWS. The owner-restricted functions of the contracts are called by this server using a privatekey stored on the server in order to determine prices and update user balances. If this AWS account of its owner were compromised, user funds would be at risk.
    • Mitigation measure: We pointed out this potential issue to the team and their innovative solution (to be deployed shortly) limits the risk of a compromised key to only 4% of user's funds (Now 40% in the high-risk pool). We have also briefly inspected the NodeJS code and the code appears to be legitimate and serve its intended purpose.
    • While there is risk associated with an owner private key having this control, the actions of the team and their willingness to mitigate this risk makes us believe the team is trustworthy. The team is also publicly known, which further reduces the probability of a malicious owner.

    • The prices fed to the Oracle contract are sent directly from the contract's owner via a single source (CoinGecko). The data sent to the oracle is not used by the Bundles contract; the team explains this oracle is so users can see the prices used to decide rewards on-chain. If CoinGecko were compromised, user funds would be at risk to an unfair/manipulated outcome.


    Date: December 5th, 2020
    Vulnerability Category Notes Result
    Arbitrary Storage Write N/A PASS
    Arbitrary Jump N/A PASS
    Delegate Call to Untrusted Contract N/A PASS
    Dependence on Predictable Variables Some functions rely on predictable environment variables. This is not best practice,
    but the probability of miners maliciously changing these variables is extremley low.
    Warning
    Deprecated Opcodes N/A PASS
    Ether/Token Thief The owner of the prediciton contract determines and sets the rewards for each user.
    If the owner key was compromised, a maximum of 4% of each user's staked
    funds would be at risk due to the implemented mitigation.
    Warning
    Exceptions N/A PASS
    External Calls N/A PASS
    Integer Over/Underflow N/A PASS
    Multiple Sends N/A PASS
    Oracle The project uses a single-source off-chain price feed from CoinGecko.
    It is highly unlikely, but possible, for this to be manipulated.
    Warning
    Suicide N/A PASS
    State Change External Calls N/A PASS
    Unchecked Retval N/A PASS
    User Supplied Assertion N/A PASS
    Critical Solidity Compiler N/A PASS
    Overall Contract Safety  -----> PASS

    Function Graph

    Smart Contract Graph

    Inheritence Chart

    Smart Contract Inheritance

    Functions Overview

    
    
     ($) = payable function
     # = non-constant function
     
     Int = Internal
     Ext = External
     Pub = Public
    
     + [Int] IERC20 
        - [Ext] totalSupply
        - [Ext] balanceOf
        - [Ext] transfer #
        - [Ext] allowance
        - [Ext] approve #
        - [Ext] transferFrom #
    
     + [Lib] SafeMath 
        - [Int] add
        - [Int] sub
        - [Int] mul
        - [Int] div
        - [Int] mod
    
     +  ERC20 (IERC20)
        - [Pub] totalSupply
        - [Pub] balanceOf
        - [Pub] transfer #
        - [Pub] allowance
        - [Pub] approve #
        - [Pub] transferFrom #
        - [Pub] increaseAllowance #
        - [Pub] decreaseAllowance #
        - [Int] _transfer #
        - [Int] _mint #
        - [Int] _burn #
        - [Int] _approve #
        - [Int] _burnFrom #
    
     +  TokenMintERC20Token (ERC20)
        - [Pub]  ($)
        - [Pub] burn #
        - [Pub] name
        - [Pub] symbol
        - [Pub] decimals
    
      
    							

    Source Code

    Click here to download the source code as a .sol file.

    
    
    /**
     *Submitted for verification at Etherscan.io on 2019-08-02
    */
    
    // File: contracts\open-zeppelin-contracts\token\ERC20\IERC20.sol
    
    pragma solidity ^0.5.0;
    
    /**
     * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
     * the optional functions; to access them see `ERC20Detailed`.
     */
    interface IERC20 {
        /**
         * @dev Returns the amount of tokens in existence.
         */
        function totalSupply() external view returns (uint256);
    
        /**
         * @dev Returns the amount of tokens owned by `account`.
         */
        function balanceOf(address account) external view returns (uint256);
    
        /**
         * @dev Moves `amount` tokens from the caller's account to `recipient`.
         *
         * Returns a boolean value indicating whether the operation succeeded.
         *
         * Emits a `Transfer` event.
         */
        function transfer(address recipient, uint256 amount) external returns (bool);
    
        /**
         * @dev Returns the remaining number of tokens that `spender` will be
         * allowed to spend on behalf of `owner` through `transferFrom`. This is
         * zero by default.
         *
         * This value changes when `approve` or `transferFrom` are called.
         */
        function allowance(address owner, address spender) external view returns (uint256);
    
        /**
         * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
         *
         * Returns a boolean value indicating whether the operation succeeded.
         *
         * > Beware that changing an allowance with this method brings the risk
         * that someone may use both the old and the new allowance by unfortunate
         * transaction ordering. One possible solution to mitigate this race
         * condition is to first reduce the spender's allowance to 0 and set the
         * desired value afterwards:
         * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
         *
         * Emits an `Approval` event.
         */
        function approve(address spender, uint256 amount) external returns (bool);
    
        /**
         * @dev Moves `amount` tokens from `sender` to `recipient` using the
         * allowance mechanism. `amount` is then deducted from the caller's
         * allowance.
         *
         * Returns a boolean value indicating whether the operation succeeded.
         *
         * Emits a `Transfer` event.
         */
        function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    
        /**
         * @dev Emitted when `value` tokens are moved from one account (`from`) to
         * another (`to`).
         *
         * Note that `value` may be zero.
         */
        event Transfer(address indexed from, address indexed to, uint256 value);
    
        /**
         * @dev Emitted when the allowance of a `spender` for an `owner` is set by
         * a call to `approve`. `value` is the new allowance.
         */
        event Approval(address indexed owner, address indexed spender, uint256 value);
    }
    
    // File: contracts\open-zeppelin-contracts\math\SafeMath.sol
    
    pragma solidity ^0.5.0;
    
    /**
     * @dev Wrappers over Solidity's arithmetic operations with added overflow
     * checks.
     *
     * Arithmetic operations in Solidity wrap on overflow. This can easily result
     * in bugs, because programmers usually assume that an overflow raises an
     * error, which is the standard behavior in high level programming languages.
     * `SafeMath` restores this intuition by reverting the transaction when an
     * operation overflows.
     *
     * Using this library instead of the unchecked operations eliminates an entire
     * class of bugs, so it's recommended to use it always.
     */
    library SafeMath {
        /**
         * @dev Returns the addition of two unsigned integers, reverting on
         * overflow.
         *
         * Counterpart to Solidity's `+` operator.
         *
         * Requirements:
         * - Addition cannot overflow.
         */
        function add(uint256 a, uint256 b) internal pure returns (uint256) {
            uint256 c = a + b;
            require(c >= a, "SafeMath: addition overflow");
    
            return c;
        }
    
        /**
         * @dev Returns the subtraction of two unsigned integers, reverting on
         * overflow (when the result is negative).
         *
         * Counterpart to Solidity's `-` operator.
         *
         * Requirements:
         * - Subtraction cannot overflow.
         */
        function sub(uint256 a, uint256 b) internal pure returns (uint256) {
            require(b <= a, "SafeMath: subtraction overflow");
            uint256 c = a - b;
    
            return c;
        }
    
        /**
         * @dev Returns the multiplication of two unsigned integers, reverting on
         * overflow.
         *
         * Counterpart to Solidity's `*` operator.
         *
         * Requirements:
         * - Multiplication cannot overflow.
         */
        function mul(uint256 a, uint256 b) internal pure returns (uint256) {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
            if (a == 0) {
                return 0;
            }
    
            uint256 c = a * b;
            require(c / a == b, "SafeMath: multiplication overflow");
    
            return c;
        }
    
        /**
         * @dev Returns the integer division of two unsigned integers. Reverts on
         * division by zero. The result is rounded towards zero.
         *
         * Counterpart to Solidity's `/` operator. Note: this function uses a
         * `revert` opcode (which leaves remaining gas untouched) while Solidity
         * uses an invalid opcode to revert (consuming all remaining gas).
         *
         * Requirements:
         * - The divisor cannot be zero.
         */
        function div(uint256 a, uint256 b) internal pure returns (uint256) {
            // Solidity only automatically asserts when dividing by 0
            require(b > 0, "SafeMath: division by zero");
            uint256 c = a / b;
            // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    
            return c;
        }
    
        /**
         * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
         * Reverts when dividing by zero.
         *
         * Counterpart to Solidity's `%` operator. This function uses a `revert`
         * opcode (which leaves remaining gas untouched) while Solidity uses an
         * invalid opcode to revert (consuming all remaining gas).
         *
         * Requirements:
         * - The divisor cannot be zero.
         */
        function mod(uint256 a, uint256 b) internal pure returns (uint256) {
            require(b != 0, "SafeMath: modulo by zero");
            return a % b;
        }
    }
    
    // File: contracts\open-zeppelin-contracts\token\ERC20\ERC20.sol
    
    pragma solidity ^0.5.0;
    
    
    
    /**
     * @dev Implementation of the `IERC20` interface.
     *
     * This implementation is agnostic to the way tokens are created. This means
     * that a supply mechanism has to be added in a derived contract using `_mint`.
     * For a generic mechanism see `ERC20Mintable`.
     *
     * *For a detailed writeup see our guide [How to implement supply
     * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
     *
     * We have followed general OpenZeppelin guidelines: functions revert instead
     * of returning `false` on failure. This behavior is nonetheless conventional
     * and does not conflict with the expectations of ERC20 applications.
     *
     * Additionally, an `Approval` event is emitted on calls to `transferFrom`.
     * This allows applications to reconstruct the allowance for all accounts just
     * by listening to said events. Other implementations of the EIP may not emit
     * these events, as it isn't required by the specification.
     *
     * Finally, the non-standard `decreaseAllowance` and `increaseAllowance`
     * functions have been added to mitigate the well-known issues around setting
     * allowances. See `IERC20.approve`.
     */
    contract ERC20 is IERC20 {
        using SafeMath for uint256;
    
        mapping (address => uint256) private _balances;
    
        mapping (address => mapping (address => uint256)) private _allowances;
    
        uint256 private _totalSupply;
    
        /**
         * @dev See `IERC20.totalSupply`.
         */
        function totalSupply() public view returns (uint256) {
            return _totalSupply;
        }
    
        /**
         * @dev See `IERC20.balanceOf`.
         */
        function balanceOf(address account) public view returns (uint256) {
            return _balances[account];
        }
    
        /**
         * @dev See `IERC20.transfer`.
         *
         * Requirements:
         *
         * - `recipient` cannot be the zero address.
         * - the caller must have a balance of at least `amount`.
         */
        function transfer(address recipient, uint256 amount) public returns (bool) {
            _transfer(msg.sender, recipient, amount);
            return true;
        }
    
        /**
         * @dev See `IERC20.allowance`.
         */
        function allowance(address owner, address spender) public view returns (uint256) {
            return _allowances[owner][spender];
        }
    
        /**
         * @dev See `IERC20.approve`.
         *
         * Requirements:
         *
         * - `spender` cannot be the zero address.
         */
        function approve(address spender, uint256 value) public returns (bool) {
            _approve(msg.sender, spender, value);
            return true;
        }
    
        /**
         * @dev See `IERC20.transferFrom`.
         *
         * Emits an `Approval` event indicating the updated allowance. This is not
         * required by the EIP. See the note at the beginning of `ERC20`;
         *
         * Requirements:
         * - `sender` and `recipient` cannot be the zero address.
         * - `sender` must have a balance of at least `value`.
         * - the caller must have allowance for `sender`'s tokens of at least
         * `amount`.
         */
        function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
            _transfer(sender, recipient, amount);
            _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
            return true;
        }
    
        /**
         * @dev Atomically increases the allowance granted to `spender` by the caller.
         *
         * This is an alternative to `approve` that can be used as a mitigation for
         * problems described in `IERC20.approve`.
         *
         * Emits an `Approval` event indicating the updated allowance.
         *
         * Requirements:
         *
         * - `spender` cannot be the zero address.
         */
        function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
            _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
            return true;
        }
    
        /**
         * @dev Atomically decreases the allowance granted to `spender` by the caller.
         *
         * This is an alternative to `approve` that can be used as a mitigation for
         * problems described in `IERC20.approve`.
         *
         * Emits an `Approval` event indicating the updated allowance.
         *
         * Requirements:
         *
         * - `spender` cannot be the zero address.
         * - `spender` must have allowance for the caller of at least
         * `subtractedValue`.
         */
        function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
            _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
            return true;
        }
    
        /**
         * @dev Moves tokens `amount` from `sender` to `recipient`.
         *
         * This is internal function is equivalent to `transfer`, and can be used to
         * e.g. implement automatic token fees, slashing mechanisms, etc.
         *
         * Emits a `Transfer` event.
         *
         * Requirements:
         *
         * - `sender` cannot be the zero address.
         * - `recipient` cannot be the zero address.
         * - `sender` must have a balance of at least `amount`.
         */
        function _transfer(address sender, address recipient, uint256 amount) internal {
            require(sender != address(0), "ERC20: transfer from the zero address");
            require(recipient != address(0), "ERC20: transfer to the zero address");
    
            _balances[sender] = _balances[sender].sub(amount);
            _balances[recipient] = _balances[recipient].add(amount);
            emit Transfer(sender, recipient, amount);
        }
    
        /** @dev Creates `amount` tokens and assigns them to `account`, increasing
         * the total supply.
         *
         * Emits a `Transfer` event with `from` set to the zero address.
         *
         * Requirements
         *
         * - `to` cannot be the zero address.
         */
        function _mint(address account, uint256 amount) internal {
            require(account != address(0), "ERC20: mint to the zero address");
    
            _totalSupply = _totalSupply.add(amount);
            _balances[account] = _balances[account].add(amount);
            emit Transfer(address(0), account, amount);
        }
    
         /**
         * @dev Destroys `amount` tokens from `account`, reducing the
         * total supply.
         *
         * Emits a `Transfer` event with `to` set to the zero address.
         *
         * Requirements
         *
         * - `account` cannot be the zero address.
         * - `account` must have at least `amount` tokens.
         */
        function _burn(address account, uint256 value) internal {
            require(account != address(0), "ERC20: burn from the zero address");
    
            _totalSupply = _totalSupply.sub(value);
            _balances[account] = _balances[account].sub(value);
            emit Transfer(account, address(0), value);
        }
    
        /**
         * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
         *
         * This is internal function is equivalent to `approve`, and can be used to
         * e.g. set automatic allowances for certain subsystems, etc.
         *
         * Emits an `Approval` event.
         *
         * Requirements:
         *
         * - `owner` cannot be the zero address.
         * - `spender` cannot be the zero address.
         */
        function _approve(address owner, address spender, uint256 value) internal {
            require(owner != address(0), "ERC20: approve from the zero address");
            require(spender != address(0), "ERC20: approve to the zero address");
    
            _allowances[owner][spender] = value;
            emit Approval(owner, spender, value);
        }
    
        /**
         * @dev Destoys `amount` tokens from `account`.`amount` is then deducted
         * from the caller's allowance.
         *
         * See `_burn` and `_approve`.
         */
        function _burnFrom(address account, uint256 amount) internal {
            _burn(account, amount);
            _approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));
        }
    }
    
    // File: contracts\ERC20\TokenMintERC20Token.sol
    
    pragma solidity ^0.5.0;
    
    
    /**
     * @title TokenMintERC20Token
     * @author TokenMint (visit https://tokenmint.io)
     *
     * @dev Standard ERC20 token with burning and optional functions implemented.
     * For full specification of ERC-20 standard see:
     * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
     */
    contract TokenMintERC20Token is ERC20 {
    
        string private _name;
        string private _symbol;
        uint8 private _decimals;
    
        /**
         * @dev Constructor.
         * @param name name of the token
         * @param symbol symbol of the token, 3-4 chars is recommended
         * @param decimals number of decimal places of one token unit, 18 is widely used
         * @param totalSupply total supply of tokens in lowest units (depending on decimals)
         * @param tokenOwnerAddress address that gets 100% of token supply
         */
        constructor(string memory name, string memory symbol, uint8 decimals, uint256 totalSupply, address payable feeReceiver, address tokenOwnerAddress) public payable {
          _name = name;
          _symbol = symbol;
          _decimals = decimals;
    
          // set tokenOwnerAddress as owner of all tokens
          _mint(tokenOwnerAddress, totalSupply);
    
          // pay the service fee for contract deployment
          feeReceiver.transfer(msg.value);
        }
    
        /**
         * @dev Burns a specific amount of tokens.
         * @param value The amount of lowest token units to be burned.
         */
        function burn(uint256 value) public {
          _burn(msg.sender, value);
        }
    
        // optional functions from ERC20 stardard
    
        /**
         * @return the name of the token.
         */
        function name() public view returns (string memory) {
          return _name;
        }
    
        /**
         * @return the symbol of the token.
         */
        function symbol() public view returns (string memory) {
          return _symbol;
        }
    
        /**
         * @return the number of decimals of the token.
         */
        function decimals() public view returns (uint8) {
          return _decimals;
        }
    }
    
    

    Function Graph

    Smart Contract Graph

    Inheritence Chart

    Smart Contract Inheritance

    Functions Overview

    
    
     +  ReentrancyGuard 
        - [Int]  #
    
     + [Int] IERC20 
        - [Ext] totalSupply
        - [Ext] balanceOf
        - [Ext] transfer #
        - [Ext] allowance
        - [Ext] approve #
        - [Ext] transferFrom #
    
     + [Lib] SafeMath 
        - [Int] add
        - [Int] sub
        - [Int] mul
        - [Int] div
        - [Int] mod
    
     +  ERC20 (IERC20)
        - [Pub] totalSupply
        - [Pub] balanceOf
        - [Pub] transfer #
        - [Pub] allowance
        - [Pub] approve #
        - [Pub] transferFrom #
        - [Pub] increaseAllowance #
        - [Pub] decreaseAllowance #
        - [Int] _transfer #
        - [Int] _mint #
        - [Int] _burn #
        - [Int] _approve #
        - [Int] _burnFrom #
    
     +  TokenMintERC20Token (ERC20)
        - [Pub]  ($)
        - [Pub] burn #
        - [Pub] name
        - [Pub] symbol
        - [Pub] decimals
    
     +  Bundles (ReentrancyGuard)
        - [Pub]  #
        - [Pub] Register #
        - [Pub] PlaceBet #
        - [Pub] updatebal #
        - [Int] updateFee #
        - [Pub] createBundle #
        - [Pub] updateowner #
        - [Pub] updatetime #
        - [Pub] withdraw #
           - modifiers: nonReentrant
        - [Pub] fetchUser
        - [Pub] fetchBundle
        - [Pub] fetchUserBets
        - [Pub] fetchUserInBundle
        - [Pub] collectdeveloperfee #
           - modifiers: nonReentrant
    
    							

    Source Code

    Click here to download the source code as a .sol file.

    
    // SPDX-License-Identifier: UNLICENSED
    
    pragma solidity <=0.7.5;
    
    
    // File: contracts\open-zeppelin-contracts\token\ERC20\IERC20.sol
    
    pragma solidity ^0.5.0;
    
    contract ReentrancyGuard {
        // Booleans are more expensive than uint256 or any type that takes up a full
        // word because each write operation emits an extra SLOAD to first read the
        // slot's contents, replace the bits taken up by the boolean, and then write
        // back. This is the compiler's defense against contract upgrades and
        // pointer aliasing, and it cannot be disabled.
    
        // The values being non-zero value makes deployment a bit more expensive,
        // but in exchange the refund on every call to nonReentrant will be lower in
        // amount. Since refunds are capped to a percentage of the total
        // transaction's gas, it is best to keep them low in cases like this one, to
        // increase the likelihood of the full refund coming into effect.
        uint256 private constant _NOT_ENTERED = 1;
        uint256 private constant _ENTERED = 2;
    
        uint256 private _status;
    
        constructor () internal {
            _status = _NOT_ENTERED;
        }
    
        /**
         * @dev Prevents a contract from calling itself, directly or indirectly.
         * Calling a `nonReentrant` function from another `nonReentrant`
         * function is not supported. It is possible to prevent this from happening
         * by making the `nonReentrant` function external, and make it call a
         * `private` function that does the actual work.
         */
        modifier nonReentrant() {
            // On the first call to nonReentrant, _notEntered will be true
            require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
    
            // Any calls to nonReentrant after this point will fail
            _status = _ENTERED;
    
            _;
    
            // By storing the original value once again, a refund is triggered (see
            // https://eips.ethereum.org/EIPS/eip-2200)
            _status = _NOT_ENTERED;
        }
    }
    
    /**
     * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
     * the optional functions; to access them see `ERC20Detailed`.
     */
    interface IERC20 {
        /**
         * @dev Returns the amount of tokens in existence.
         */
        function totalSupply() external view returns (uint256);
    
        /**
         * @dev Returns the amount of tokens owned by `account`.
         */
        function balanceOf(address account) external view returns (uint256);
    
        /**
         * @dev Moves `amount` tokens from the caller's account to `recipient`.
         *
         * Returns a boolean value indicating whether the operation succeeded.
         *
         * Emits a `Transfer` event.
         */
        function transfer(address recipient, uint256 amount) external returns (bool);
    
        /**
         * @dev Returns the remaining number of tokens that `spender` will be
         * allowed to spend on behalf of `owner` through `transferFrom`. This is
         * zero by default.
         *
         * This value changes when `approve` or `transferFrom` are called.
         */
        function allowance(address owner, address spender) external view returns (uint256);
    
        /**
         * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
         *
         * Returns a boolean value indicating whether the operation succeeded.
         *
         * > Beware that changing an allowance with this method brings the risk
         * that someone may use both the old and the new allowance by unfortunate
         * transaction ordering. One possible solution to mitigate this race
         * condition is to first reduce the spender's allowance to 0 and set the
         * desired value afterwards:
         * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
         *
         * Emits an `Approval` event.
         */
        function approve(address spender, uint256 amount) external returns (bool);
    
        /**
         * @dev Moves `amount` tokens from `sender` to `recipient` using the
         * allowance mechanism. `amount` is then deducted from the caller's
         * allowance.
         *
         * Returns a boolean value indicating whether the operation succeeded.
         *
         * Emits a `Transfer` event.
         */
        function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    
        /**
         * @dev Emitted when `value` tokens are moved from one account (`from`) to
         * another (`to`).
         *
         * Note that `value` may be zero.
         */
        event Transfer(address indexed from, address indexed to, uint256 value);
    
        /**
         * @dev Emitted when the allowance of a `spender` for an `owner` is set by
         * a call to `approve`. `value` is the new allowance.
         */
        event Approval(address indexed owner, address indexed spender, uint256 value);
    }
    
    // File: contracts\open-zeppelin-contracts\math\SafeMath.sol
    
    pragma solidity ^0.5.0;
    
    /**
     * @dev Wrappers over Solidity's arithmetic operations with added overflow
     * checks.
     *
     * Arithmetic operations in Solidity wrap on overflow. This can easily result
     * in bugs, because programmers usually assume that an overflow raises an
     * error, which is the standard behavior in high level programming languages.
     * `SafeMath` restores this intuition by reverting the transaction when an
     * operation overflows.
     *
     * Using this library instead of the unchecked operations eliminates an entire
     * class of bugs, so it's recommended to use it always.
     */
    library SafeMath {
        /**
         * @dev Returns the addition of two unsigned integers, reverting on
         * overflow.
         *
         * Counterpart to Solidity's `+` operator.
         *
         * Requirements:
         * - Addition cannot overflow.
         */
        function add(uint256 a, uint256 b) internal pure returns (uint256) {
            uint256 c = a + b;
            require(c >= a, "SafeMath: addition overflow");
    
            return c;
        }
    
        /**
         * @dev Returns the subtraction of two unsigned integers, reverting on
         * overflow (when the result is negative).
         *
         * Counterpart to Solidity's `-` operator.
         *
         * Requirements:
         * - Subtraction cannot overflow.
         */
        function sub(uint256 a, uint256 b) internal pure returns (uint256) {
            require(b <= a, "SafeMath: subtraction overflow");
            uint256 c = a - b;
    
            return c;
        }
    
        /**
         * @dev Returns the multiplication of two unsigned integers, reverting on
         * overflow.
         *
         * Counterpart to Solidity's `*` operator.
         *
         * Requirements:
         * - Multiplication cannot overflow.
         */
        function mul(uint256 a, uint256 b) internal pure returns (uint256) {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
            if (a == 0) {
                return 0;
            }
    
            uint256 c = a * b;
            require(c / a == b, "SafeMath: multiplication overflow");
    
            return c;
        }
    
        /**
         * @dev Returns the integer division of two unsigned integers. Reverts on
         * division by zero. The result is rounded towards zero.
         *
         * Counterpart to Solidity's `/` operator. Note: this function uses a
         * `revert` opcode (which leaves remaining gas untouched) while Solidity
         * uses an invalid opcode to revert (consuming all remaining gas).
         *
         * Requirements:
         * - The divisor cannot be zero.
         */
        function div(uint256 a, uint256 b) internal pure returns (uint256) {
            // Solidity only automatically asserts when dividing by 0
            require(b > 0, "SafeMath: division by zero");
            uint256 c = a / b;
            // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    
            return c;
        }
    
        /**
         * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
         * Reverts when dividing by zero.
         *
         * Counterpart to Solidity's `%` operator. This function uses a `revert`
         * opcode (which leaves remaining gas untouched) while Solidity uses an
         * invalid opcode to revert (consuming all remaining gas).
         *
         * Requirements:
         * - The divisor cannot be zero.
         */
        function mod(uint256 a, uint256 b) internal pure returns (uint256) {
            require(b != 0, "SafeMath: modulo by zero");
            return a % b;
        }
    }
    
    // File: contracts\open-zeppelin-contracts\token\ERC20\ERC20.sol
    
    pragma solidity ^0.5.0;
    
    
    
    /**
     * @dev Implementation of the `IERC20` interface.
     *
     * This implementation is agnostic to the way tokens are created. This means
     * that a supply mechanism has to be added in a derived contract using `_mint`.
     * For a generic mechanism see `ERC20Mintable`.
     *
     * *For a detailed writeup see our guide [How to implement supply
     * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
     *
     * We have followed general OpenZeppelin guidelines: functions revert instead
     * of returning `false` on failure. This behavior is nonetheless conventional
     * and does not conflict with the expectations of ERC20 applications.
     *
     * Additionally, an `Approval` event is emitted on calls to `transferFrom`.
     * This allows applications to reconstruct the allowance for all accounts just
     * by listening to said events. Other implementations of the EIP may not emit
     * these events, as it isn't required by the specification.
     *
     * Finally, the non-standard `decreaseAllowance` and `increaseAllowance`
     * functions have been added to mitigate the well-known issues around setting
     * allowances. See `IERC20.approve`.
     */
    contract ERC20 is IERC20 {
        using SafeMath for uint256;
    
        mapping (address => uint256) private _balances;
    
        mapping (address => mapping (address => uint256)) private _allowances;
    
        uint256 private _totalSupply;
    
        /**
         * @dev See `IERC20.totalSupply`.
         */
        function totalSupply() public view returns (uint256) {
            return _totalSupply;
        }
    
        /**
         * @dev See `IERC20.balanceOf`.
         */
        function balanceOf(address account) public view returns (uint256) {
            return _balances[account];
        }
    
        /**
         * @dev See `IERC20.transfer`.
         *
         * Requirements:
         *
         * - `recipient` cannot be the zero address.
         * - the caller must have a balance of at least `amount`.
         */
        function transfer(address recipient, uint256 amount) public returns (bool) {
            _transfer(msg.sender, recipient, amount);
            return true;
        }
    
        /**
         * @dev See `IERC20.allowance`.
         */
        function allowance(address owner, address spender) public view returns (uint256) {
            return _allowances[owner][spender];
        }
    
        /**
         * @dev See `IERC20.approve`.
         *
         * Requirements:
         *
         * - `spender` cannot be the zero address.
         */
        function approve(address spender, uint256 value) public returns (bool) {
            _approve(msg.sender, spender, value);
            return true;
        }
    
        /**
         * @dev See `IERC20.transferFrom`.
         *
         * Emits an `Approval` event indicating the updated allowance. This is not
         * required by the EIP. See the note at the beginning of `ERC20`;
         *
         * Requirements:
         * - `sender` and `recipient` cannot be the zero address.
         * - `sender` must have a balance of at least `value`.
         * - the caller must have allowance for `sender`'s tokens of at least
         * `amount`.
         */
        function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
            _transfer(sender, recipient, amount);
            _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
            return true;
        }
    
        /**
         * @dev Atomically increases the allowance granted to `spender` by the caller.
         *
         * This is an alternative to `approve` that can be used as a mitigation for
         * problems described in `IERC20.approve`.
         *
         * Emits an `Approval` event indicating the updated allowance.
         *
         * Requirements:
         *
         * - `spender` cannot be the zero address.
         */
        function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
            _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
            return true;
        }
    
        /**
         * @dev Atomically decreases the allowance granted to `spender` by the caller.
         *
         * This is an alternative to `approve` that can be used as a mitigation for
         * problems described in `IERC20.approve`.
         *
         * Emits an `Approval` event indicating the updated allowance.
         *
         * Requirements:
         *
         * - `spender` cannot be the zero address.
         * - `spender` must have allowance for the caller of at least
         * `subtractedValue`.
         */
        function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
            _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
            return true;
        }
    
        /**
         * @dev Moves tokens `amount` from `sender` to `recipient`.
         *
         * This is internal function is equivalent to `transfer`, and can be used to
         * e.g. implement automatic token fees, slashing mechanisms, etc.
         *
         * Emits a `Transfer` event.
         *
         * Requirements:
         *
         * - `sender` cannot be the zero address.
         * - `recipient` cannot be the zero address.
         * - `sender` must have a balance of at least `amount`.
         */
        function _transfer(address sender, address recipient, uint256 amount) internal {
            require(sender != address(0), "ERC20: transfer from the zero address");
            require(recipient != address(0), "ERC20: transfer to the zero address");
    
            _balances[sender] = _balances[sender].sub(amount);
            _balances[recipient] = _balances[recipient].add(amount);
            emit Transfer(sender, recipient, amount);
        }
    
        /** @dev Creates `amount` tokens and assigns them to `account`, increasing
         * the total supply.
         *
         * Emits a `Transfer` event with `from` set to the zero address.
         *
         * Requirements
         *
         * - `to` cannot be the zero address.
         */
        function _mint(address account, uint256 amount) internal {
            require(account != address(0), "ERC20: mint to the zero address");
    
            _totalSupply = _totalSupply.add(amount);
            _balances[account] = _balances[account].add(amount);
            emit Transfer(address(0), account, amount);
        }
    
         /**
         * @dev Destroys `amount` tokens from `account`, reducing the
         * total supply.
         *
         * Emits a `Transfer` event with `to` set to the zero address.
         *
         * Requirements
         *
         * - `account` cannot be the zero address.
         * - `account` must have at least `amount` tokens.
         */
        function _burn(address account, uint256 value) internal {
            require(account != address(0), "ERC20: burn from the zero address");
    
            _totalSupply = _totalSupply.sub(value);
            _balances[account] = _balances[account].sub(value);
            emit Transfer(account, address(0), value);
        }
    
        /**
         * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
         *
         * This is internal function is equivalent to `approve`, and can be used to
         * e.g. set automatic allowances for certain subsystems, etc.
         *
         * Emits an `Approval` event.
         *
         * Requirements:
         *
         * - `owner` cannot be the zero address.
         * - `spender` cannot be the zero address.
         */
        function _approve(address owner, address spender, uint256 value) internal {
            require(owner != address(0), "ERC20: approve from the zero address");
            require(spender != address(0), "ERC20: approve to the zero address");
    
            _allowances[owner][spender] = value;
            emit Approval(owner, spender, value);
        }
    
        /**
         * @dev Destoys `amount` tokens from `account`.`amount` is then deducted
         * from the caller's allowance.
         *
         * See `_burn` and `_approve`.
         */
        function _burnFrom(address account, uint256 amount) internal {
            _burn(account, amount);
            _approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));
        }
    }
    
    // File: contracts\ERC20\TokenMintERC20Token.sol
    
    pragma solidity ^0.5.0;
    
    
    /**
     * @title TokenMintERC20Token
     * @author TokenMint (visit https://tokenmint.io)
     *
     * @dev Standard ERC20 token with burning and optional functions implemented.
     * For full specification of ERC-20 standard see:
     * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
     */
    contract TokenMintERC20Token is ERC20 {
    
        string private _name;
        string private _symbol;
        uint8 private _decimals;
    
        /**
         * @dev Constructor.
         * @param name name of the token
         * @param symbol symbol of the token, 3-4 chars is recommended
         * @param decimals number of decimal places of one token unit, 18 is widely used
         * @param totalSupply total supply of tokens in lowest units (depending on decimals)
         * @param tokenOwnerAddress address that gets 100% of token supply
         */
        constructor(string memory name, string memory symbol, uint8 decimals, uint256 totalSupply, address payable feeReceiver, address tokenOwnerAddress) public payable {
          _name = name;
          _symbol = symbol;
          _decimals = decimals;
    
          // set tokenOwnerAddress as owner of all tokens
          _mint(tokenOwnerAddress, totalSupply);
    
          // pay the service fee for contract deployment
          feeReceiver.transfer(msg.value);
        }
    
        /**
         * @dev Burns a specific amount of tokens.
         * @param value The amount of lowest token units to be burned.
         */
        function burn(uint256 value) public {
          _burn(msg.sender, value);
        }
    
        // optional functions from ERC20 stardard
    
        /**
         * @return the name of the token.
         */
        function name() public view returns (string memory) {
          return _name;
        }
    
        /**
         * @return the symbol of the token.
         */
        function symbol() public view returns (string memory) {
          return _symbol;
        }
    
        /**
         * @return the number of decimals of the token.
         */
        function decimals() public view returns (uint8) {
          return _decimals;
        }
    }
    
    contract Bundles is ReentrancyGuard {
        
        uint256 public bundleId = 1;
        address public owner;
        
        /* Bundle Token Address */
        
        TokenMintERC20Token public bundle_address;
        
        /* Variable to store the fee collected */
        
        uint256 public fee_collected;       
        
        /* Last Created Informations*/
        
        uint256 public lastcreated;
        uint256 lastbundlecreated;
    
        struct UserBets{
            uint256[10] bundles;
            uint256[10] amounts;
            uint256[10] prices;
            bool betted;
            uint256 balance;
            uint256 totalbet;
            bool claimed;
        }
        
        struct User{
            uint256[] bundles;
            string username;
            uint256 balance;
            uint256 freebal;
            bool active;
        }
        
        struct Data{
            address[] user;
        }
        
        struct Bundle{
            uint256[10] prices;
            uint256 startime;
            uint256 stakingends;
            uint256 endtime;
        }
        
        mapping(address => mapping(uint256 => UserBets)) bets;
        mapping(uint256 => Bundle) bundle;
        mapping(address => User) user;
        mapping(uint256 => Data) data;
        
        constructor(address _bundle_address) public{
            owner = msg.sender;
            bundle_address = TokenMintERC20Token(_bundle_address);
            lastcreated = block.timestamp;
        }
        
        /*  Registering the username to the contract */
        
        function Register(string memory _username) public returns(bool){
            User storage us = user[msg.sender];
            require(us.active == false,'Existing User');
            us.active = true;
            us.username = _username;
            return true;
        }
        
        /* For placing a prediction in the bundle. */
        
        function PlaceBet(uint256 index,uint256 _prices,uint256 _percent,uint256 _bundleId,uint256 _amount) public returns(bool){
            require(_bundleId <= bundleId,'Invalid Bundle');
            require(bundle_address.allowance(msg.sender,address(this))>=_amount,'Approval failed');
            Bundle storage b = bundle[_bundleId];
            Data storage d = data[_bundleId];
            require(b.stakingends >= block.timestamp,'Ended');
            User storage us = user[msg.sender];
            require(us.active == true,'Register to participate');
            UserBets storage u = bets[msg.sender][_bundleId];
            require(u.bundles[index] == 0,'Already Betted');
            if(u.betted == false){
                u.balance = bundle_address.balanceOf(msg.sender);
                u.betted = true;
            }
            else{
                require(SafeMath.add(u.totalbet,_amount) <= u.balance,'Threshold Reached');
            }
            us.bundles.push(_bundleId);
            us.balance = SafeMath.add(us.balance,_amount);
            u.bundles[index] = _percent; 
            u.prices[index] = _prices; 
            u.amounts[index] = _amount;
            u.totalbet = u.totalbet + _amount;
            d.user.push(msg.sender);
            bundle_address.transferFrom(msg.sender,address(this),_amount);
            return true;
        }
        
        /* Update user balance. Max 4% can be changed */
        
        function updatebal(address _user,uint256 _bundleId,uint256 _reward,bool _isPositive) public returns(bool){
            require(msg.sender == owner,'Not Owner');
            require(_reward <= 4000000,'Invalid Reward Percent');
            User storage us = user[_user];
            require(us.active == true,'Invalid User');
            UserBets storage u = bets[_user][_bundleId];
            require(u.claimed == false,'Already Claimed');
            if(_isPositive == true){
                updateFee(_reward,u.totalbet);
                uint256 temp = SafeMath.mul(_reward,90);
                uint256 reward = SafeMath.div(temp,100);
                uint256 a = SafeMath.mul(u.totalbet,reward);
                uint256 b = SafeMath.div(a,10**8);
                uint256 c = SafeMath.add(u.totalbet,b);
                u.claimed = true;
                us.freebal = SafeMath.add(c,us.freebal);
                us.balance = SafeMath.sub(us.balance,u.totalbet);
            }
            else{
                uint256 a = SafeMath.mul(u.totalbet,_reward);
                uint256 b = SafeMath.div(a,10**8);
                uint256 c = SafeMath.sub(u.totalbet,b);
                u.claimed = true;
                us.freebal = SafeMath.add(c,us.freebal);
                us.balance = SafeMath.sub(us.balance,u.totalbet);
            }
            return true;
        }
        
        /* Update the fee incurred */
        
        function updateFee(uint256 r,uint256 amt) internal{
            uint256 temp = SafeMath.mul(r,10);
            uint256 reward = SafeMath.div(temp,100);
            uint256 a = SafeMath.mul(amt,reward);
            uint256 b = SafeMath.div(a,10**8);
            fee_collected = SafeMath.add(fee_collected,b);
        }
        
        /* Create a new bundle after 3 days */
        
        function createBundle(uint256[10] memory _prices) public returns(bool){
            require(msg.sender == owner,'Not Owner');
            require( block.timestamp > lastbundlecreated +  3 days,'Cannot Create');
            Bundle storage b = bundle[bundleId];
            b.prices = _prices;
            b.startime = block.timestamp;
            lastbundlecreated = block.timestamp;
            lastcreated = block.timestamp;
            b.endtime = SafeMath.add(block.timestamp,3 days);
            b.stakingends = SafeMath.add(block.timestamp,1 days);
            bundleId = SafeMath.add(bundleId,1);
            return true;
        }
        
        /* Update new owner of the contract */
        
        function updateowner(address new_owner) public returns(bool){
            require(msg.sender == owner,'Not an Owner');
            owner = new_owner;
            return true;
        }
        
        /* Update the timestamp of the last creted bundle. this function cannot change the bundle time. Last created variable is for display sake. */
        
        function updatetime(uint256 _timestamp) public returns(bool){
            require(msg.sender == owner,'Not an owner');
            lastcreated =  _timestamp;
        }
        
        /* Allows the user to withdraw his claimable balance from the contract */
        
        function withdraw() public nonReentrant returns(bool){
           User storage us = user[msg.sender];
           require(us.active == true,'Invalid User'); 
           require(us.freebal > 0,'No bal');
           bundle_address.transfer(msg.sender,us.freebal);
           us.freebal = 0;
           return true;
        }
        
        /*  Fetch the information about user. His claimable balance, fixed balance & stuff */
         
        function fetchUser(address _user) public view returns(uint256[] memory _bundles,string memory username,uint256 claimable,uint256 staked_balance, bool active){
            User storage us = user[_user];
            return(us.bundles,us.username,us.freebal,us.balance,us.active);
        }
        
        /* Fetch the information of a BundleId */
        
        function fetchBundle(uint256 _bundleId) public view returns(uint256[10] memory _prices,uint256 _start,uint256 _end,uint256 _staking_ends){
            Bundle storage b = bundle[_bundleId];
            return(b.prices,b.startime,b.endtime,b.stakingends);
        }
        
        /* Fetch the prediction information of each user in each bundle. Pass bundleId and User Address to get the strike price as well as the amount in 18 decimals */
        
        function fetchUserBets(address _user, uint256 _bundleId) public view returns(uint256[10] memory _bundles,uint256[10] memory _prices,uint256[10] memory _amounts,uint256 balance,uint256 totalbet){
            UserBets storage u = bets[_user][_bundleId];
            return (u.bundles,u.prices,u.amounts,u.balance,u.totalbet);
        }
        
        /* Fetch all the user wallet predicted in a bundleId. Pass bundleId and will return an array of betters */
        
        function fetchUserInBundle(uint256 _bundleId) public view returns(address[] memory _betters){
            Data storage d = data[_bundleId];
            return d.user;
        }
        
        /*  
            Only Allow the Developer to withdraw the developer fee
        */
        
        function collectdeveloperfee() public nonReentrant returns(bool){
            require(msg.sender == owner,'To Be Claimed By Developer');
            bundle_address.transfer(msg.sender,fee_collected);
            fee_collected = 0;
            return true;
        }
        
    }
    
    

    Function Graph

    Smart Contract Graph

    Inheritence Chart

    Smart Contract Inheritance

    Functions Overview

    
    
     +  ReentrancyGuard 
        - [Int]  #
    
     + [Int] IERC20 
        - [Ext] totalSupply
        - [Ext] balanceOf
        - [Ext] transfer #
        - [Ext] allowance
        - [Ext] approve #
        - [Ext] transferFrom #
    
     + [Lib] SafeMath 
        - [Int] add
        - [Int] sub
        - [Int] mul
        - [Int] div
        - [Int] mod
    
     +  ERC20 (IERC20)
        - [Pub] totalSupply
        - [Pub] balanceOf
        - [Pub] transfer #
        - [Pub] allowance
        - [Pub] approve #
        - [Pub] transferFrom #
        - [Pub] increaseAllowance #
        - [Pub] decreaseAllowance #
        - [Int] _transfer #
        - [Int] _mint #
        - [Int] _burn #
        - [Int] _approve #
        - [Int] _burnFrom #
    
     +  TokenMintERC20Token (ERC20)
        - [Pub]  ($)
        - [Pub] burn #
        - [Pub] name
        - [Pub] symbol
        - [Pub] decimals
    
     +  Bundles (ReentrancyGuard)
        - [Pub]  #
        - [Pub] Register #
        - [Pub] PlaceBet #
        - [Pub] updatebal #
        - [Int] updateFee #
        - [Pub] createBundle #
        - [Pub] updateowner #
        - [Pub] updatetime #
        - [Pub] withdraw #
           - modifiers: nonReentrant
        - [Pub] fetchUser
        - [Pub] fetchBundle
        - [Pub] fetchUserBets
        - [Pub] fetchUserInBundle
        - [Pub] collectdeveloperfee #
           - modifiers: nonReentrant
    
    							

    Source Code

    Click here to download the source code as a .sol file.

    
    /**
     *Submitted for verification at Etherscan.io on 2020-12-11
    */
    
    // SPDX-License-Identifier: UNLICENSED
    
    pragma solidity <=0.7.5;
    
    
    // File: contracts\open-zeppelin-contracts\token\ERC20\IERC20.sol
    
    pragma solidity ^0.5.0;
    
    contract ReentrancyGuard {
        // Booleans are more expensive than uint256 or any type that takes up a full
        // word because each write operation emits an extra SLOAD to first read the
        // slot's contents, replace the bits taken up by the boolean, and then write
        // back. This is the compiler's defense against contract upgrades and
        // pointer aliasing, and it cannot be disabled.
    
        // The values being non-zero value makes deployment a bit more expensive,
        // but in exchange the refund on every call to nonReentrant will be lower in
        // amount. Since refunds are capped to a percentage of the total
        // transaction's gas, it is best to keep them low in cases like this one, to
        // increase the likelihood of the full refund coming into effect.
        uint256 private constant _NOT_ENTERED = 1;
        uint256 private constant _ENTERED = 2;
    
        uint256 private _status;
    
        constructor () internal {
            _status = _NOT_ENTERED;
        }
    
        /**
         * @dev Prevents a contract from calling itself, directly or indirectly.
         * Calling a `nonReentrant` function from another `nonReentrant`
         * function is not supported. It is possible to prevent this from happening
         * by making the `nonReentrant` function external, and make it call a
         * `private` function that does the actual work.
         */
        modifier nonReentrant() {
            // On the first call to nonReentrant, _notEntered will be true
            require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
    
            // Any calls to nonReentrant after this point will fail
            _status = _ENTERED;
    
            _;
    
            // By storing the original value once again, a refund is triggered (see
            // https://eips.ethereum.org/EIPS/eip-2200)
            _status = _NOT_ENTERED;
        }
    }
    
    /**
     * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
     * the optional functions; to access them see `ERC20Detailed`.
     */
    interface IERC20 {
        /**
         * @dev Returns the amount of tokens in existence.
         */
        function totalSupply() external view returns (uint256);
    
        /**
         * @dev Returns the amount of tokens owned by `account`.
         */
        function balanceOf(address account) external view returns (uint256);
    
        /**
         * @dev Moves `amount` tokens from the caller's account to `recipient`.
         *
         * Returns a boolean value indicating whether the operation succeeded.
         *
         * Emits a `Transfer` event.
         */
        function transfer(address recipient, uint256 amount) external returns (bool);
    
        /**
         * @dev Returns the remaining number of tokens that `spender` will be
         * allowed to spend on behalf of `owner` through `transferFrom`. This is
         * zero by default.
         *
         * This value changes when `approve` or `transferFrom` are called.
         */
        function allowance(address owner, address spender) external view returns (uint256);
    
        /**
         * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
         *
         * Returns a boolean value indicating whether the operation succeeded.
         *
         * > Beware that changing an allowance with this method brings the risk
         * that someone may use both the old and the new allowance by unfortunate
         * transaction ordering. One possible solution to mitigate this race
         * condition is to first reduce the spender's allowance to 0 and set the
         * desired value afterwards:
         * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
         *
         * Emits an `Approval` event.
         */
        function approve(address spender, uint256 amount) external returns (bool);
    
        /**
         * @dev Moves `amount` tokens from `sender` to `recipient` using the
         * allowance mechanism. `amount` is then deducted from the caller's
         * allowance.
         *
         * Returns a boolean value indicating whether the operation succeeded.
         *
         * Emits a `Transfer` event.
         */
        function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    
        /**
         * @dev Emitted when `value` tokens are moved from one account (`from`) to
         * another (`to`).
         *
         * Note that `value` may be zero.
         */
        event Transfer(address indexed from, address indexed to, uint256 value);
    
        /**
         * @dev Emitted when the allowance of a `spender` for an `owner` is set by
         * a call to `approve`. `value` is the new allowance.
         */
        event Approval(address indexed owner, address indexed spender, uint256 value);
    }
    
    // File: contracts\open-zeppelin-contracts\math\SafeMath.sol
    
    pragma solidity ^0.5.0;
    
    /**
     * @dev Wrappers over Solidity's arithmetic operations with added overflow
     * checks.
     *
     * Arithmetic operations in Solidity wrap on overflow. This can easily result
     * in bugs, because programmers usually assume that an overflow raises an
     * error, which is the standard behavior in high level programming languages.
     * `SafeMath` restores this intuition by reverting the transaction when an
     * operation overflows.
     *
     * Using this library instead of the unchecked operations eliminates an entire
     * class of bugs, so it's recommended to use it always.
     */
    library SafeMath {
        /**
         * @dev Returns the addition of two unsigned integers, reverting on
         * overflow.
         *
         * Counterpart to Solidity's `+` operator.
         *
         * Requirements:
         * - Addition cannot overflow.
         */
        function add(uint256 a, uint256 b) internal pure returns (uint256) {
            uint256 c = a + b;
            require(c >= a, "SafeMath: addition overflow");
    
            return c;
        }
    
        /**
         * @dev Returns the subtraction of two unsigned integers, reverting on
         * overflow (when the result is negative).
         *
         * Counterpart to Solidity's `-` operator.
         *
         * Requirements:
         * - Subtraction cannot overflow.
         */
        function sub(uint256 a, uint256 b) internal pure returns (uint256) {
            require(b <= a, "SafeMath: subtraction overflow");
            uint256 c = a - b;
    
            return c;
        }
    
        /**
         * @dev Returns the multiplication of two unsigned integers, reverting on
         * overflow.
         *
         * Counterpart to Solidity's `*` operator.
         *
         * Requirements:
         * - Multiplication cannot overflow.
         */
        function mul(uint256 a, uint256 b) internal pure returns (uint256) {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
            if (a == 0) {
                return 0;
            }
    
            uint256 c = a * b;
            require(c / a == b, "SafeMath: multiplication overflow");
    
            return c;
        }
    
        /**
         * @dev Returns the integer division of two unsigned integers. Reverts on
         * division by zero. The result is rounded towards zero.
         *
         * Counterpart to Solidity's `/` operator. Note: this function uses a
         * `revert` opcode (which leaves remaining gas untouched) while Solidity
         * uses an invalid opcode to revert (consuming all remaining gas).
         *
         * Requirements:
         * - The divisor cannot be zero.
         */
        function div(uint256 a, uint256 b) internal pure returns (uint256) {
            // Solidity only automatically asserts when dividing by 0
            require(b > 0, "SafeMath: division by zero");
            uint256 c = a / b;
            // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    
            return c;
        }
    
        /**
         * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
         * Reverts when dividing by zero.
         *
         * Counterpart to Solidity's `%` operator. This function uses a `revert`
         * opcode (which leaves remaining gas untouched) while Solidity uses an
         * invalid opcode to revert (consuming all remaining gas).
         *
         * Requirements:
         * - The divisor cannot be zero.
         */
        function mod(uint256 a, uint256 b) internal pure returns (uint256) {
            require(b != 0, "SafeMath: modulo by zero");
            return a % b;
        }
    }
    
    // File: contracts\open-zeppelin-contracts\token\ERC20\ERC20.sol
    
    pragma solidity ^0.5.0;
    
    
    
    /**
     * @dev Implementation of the `IERC20` interface.
     *
     * This implementation is agnostic to the way tokens are created. This means
     * that a supply mechanism has to be added in a derived contract using `_mint`.
     * For a generic mechanism see `ERC20Mintable`.
     *
     * *For a detailed writeup see our guide [How to implement supply
     * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
     *
     * We have followed general OpenZeppelin guidelines: functions revert instead
     * of returning `false` on failure. This behavior is nonetheless conventional
     * and does not conflict with the expectations of ERC20 applications.
     *
     * Additionally, an `Approval` event is emitted on calls to `transferFrom`.
     * This allows applications to reconstruct the allowance for all accounts just
     * by listening to said events. Other implementations of the EIP may not emit
     * these events, as it isn't required by the specification.
     *
     * Finally, the non-standard `decreaseAllowance` and `increaseAllowance`
     * functions have been added to mitigate the well-known issues around setting
     * allowances. See `IERC20.approve`.
     */
    contract ERC20 is IERC20 {
        using SafeMath for uint256;
    
        mapping (address => uint256) private _balances;
    
        mapping (address => mapping (address => uint256)) private _allowances;
    
        uint256 private _totalSupply;
    
        /**
         * @dev See `IERC20.totalSupply`.
         */
        function totalSupply() public view returns (uint256) {
            return _totalSupply;
        }
    
        /**
         * @dev See `IERC20.balanceOf`.
         */
        function balanceOf(address account) public view returns (uint256) {
            return _balances[account];
        }
    
        /**
         * @dev See `IERC20.transfer`.
         *
         * Requirements:
         *
         * - `recipient` cannot be the zero address.
         * - the caller must have a balance of at least `amount`.
         */
        function transfer(address recipient, uint256 amount) public returns (bool) {
            _transfer(msg.sender, recipient, amount);
            return true;
        }
    
        /**
         * @dev See `IERC20.allowance`.
         */
        function allowance(address owner, address spender) public view returns (uint256) {
            return _allowances[owner][spender];
        }
    
        /**
         * @dev See `IERC20.approve`.
         *
         * Requirements:
         *
         * - `spender` cannot be the zero address.
         */
        function approve(address spender, uint256 value) public returns (bool) {
            _approve(msg.sender, spender, value);
            return true;
        }
    
        /**
         * @dev See `IERC20.transferFrom`.
         *
         * Emits an `Approval` event indicating the updated allowance. This is not
         * required by the EIP. See the note at the beginning of `ERC20`;
         *
         * Requirements:
         * - `sender` and `recipient` cannot be the zero address.
         * - `sender` must have a balance of at least `value`.
         * - the caller must have allowance for `sender`'s tokens of at least
         * `amount`.
         */
        function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
            _transfer(sender, recipient, amount);
            _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
            return true;
        }
    
        /**
         * @dev Atomically increases the allowance granted to `spender` by the caller.
         *
         * This is an alternative to `approve` that can be used as a mitigation for
         * problems described in `IERC20.approve`.
         *
         * Emits an `Approval` event indicating the updated allowance.
         *
         * Requirements:
         *
         * - `spender` cannot be the zero address.
         */
        function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
            _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
            return true;
        }
    
        /**
         * @dev Atomically decreases the allowance granted to `spender` by the caller.
         *
         * This is an alternative to `approve` that can be used as a mitigation for
         * problems described in `IERC20.approve`.
         *
         * Emits an `Approval` event indicating the updated allowance.
         *
         * Requirements:
         *
         * - `spender` cannot be the zero address.
         * - `spender` must have allowance for the caller of at least
         * `subtractedValue`.
         */
        function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
            _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
            return true;
        }
    
        /**
         * @dev Moves tokens `amount` from `sender` to `recipient`.
         *
         * This is internal function is equivalent to `transfer`, and can be used to
         * e.g. implement automatic token fees, slashing mechanisms, etc.
         *
         * Emits a `Transfer` event.
         *
         * Requirements:
         *
         * - `sender` cannot be the zero address.
         * - `recipient` cannot be the zero address.
         * - `sender` must have a balance of at least `amount`.
         */
        function _transfer(address sender, address recipient, uint256 amount) internal {
            require(sender != address(0), "ERC20: transfer from the zero address");
            require(recipient != address(0), "ERC20: transfer to the zero address");
    
            _balances[sender] = _balances[sender].sub(amount);
            _balances[recipient] = _balances[recipient].add(amount);
            emit Transfer(sender, recipient, amount);
        }
    
        /** @dev Creates `amount` tokens and assigns them to `account`, increasing
         * the total supply.
         *
         * Emits a `Transfer` event with `from` set to the zero address.
         *
         * Requirements
         *
         * - `to` cannot be the zero address.
         */
        function _mint(address account, uint256 amount) internal {
            require(account != address(0), "ERC20: mint to the zero address");
    
            _totalSupply = _totalSupply.add(amount);
            _balances[account] = _balances[account].add(amount);
            emit Transfer(address(0), account, amount);
        }
    
         /**
         * @dev Destroys `amount` tokens from `account`, reducing the
         * total supply.
         *
         * Emits a `Transfer` event with `to` set to the zero address.
         *
         * Requirements
         *
         * - `account` cannot be the zero address.
         * - `account` must have at least `amount` tokens.
         */
        function _burn(address account, uint256 value) internal {
            require(account != address(0), "ERC20: burn from the zero address");
    
            _totalSupply = _totalSupply.sub(value);
            _balances[account] = _balances[account].sub(value);
            emit Transfer(account, address(0), value);
        }
    
        /**
         * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
         *
         * This is internal function is equivalent to `approve`, and can be used to
         * e.g. set automatic allowances for certain subsystems, etc.
         *
         * Emits an `Approval` event.
         *
         * Requirements:
         *
         * - `owner` cannot be the zero address.
         * - `spender` cannot be the zero address.
         */
        function _approve(address owner, address spender, uint256 value) internal {
            require(owner != address(0), "ERC20: approve from the zero address");
            require(spender != address(0), "ERC20: approve to the zero address");
    
            _allowances[owner][spender] = value;
            emit Approval(owner, spender, value);
        }
    
        /**
         * @dev Destoys `amount` tokens from `account`.`amount` is then deducted
         * from the caller's allowance.
         *
         * See `_burn` and `_approve`.
         */
        function _burnFrom(address account, uint256 amount) internal {
            _burn(account, amount);
            _approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));
        }
    }
    
    // File: contracts\ERC20\TokenMintERC20Token.sol
    
    pragma solidity ^0.5.0;
    
    
    /**
     * @title TokenMintERC20Token
     * @author TokenMint (visit https://tokenmint.io)
     *
     * @dev Standard ERC20 token with burning and optional functions implemented.
     * For full specification of ERC-20 standard see:
     * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
     */
    contract TokenMintERC20Token is ERC20 {
    
        string private _name;
        string private _symbol;
        uint8 private _decimals;
    
        /**
         * @dev Constructor.
         * @param name name of the token
         * @param symbol symbol of the token, 3-4 chars is recommended
         * @param decimals number of decimal places of one token unit, 18 is widely used
         * @param totalSupply total supply of tokens in lowest units (depending on decimals)
         * @param tokenOwnerAddress address that gets 100% of token supply
         */
        constructor(string memory name, string memory symbol, uint8 decimals, uint256 totalSupply, address payable feeReceiver, address tokenOwnerAddress) public payable {
          _name = name;
          _symbol = symbol;
          _decimals = decimals;
    
          // set tokenOwnerAddress as owner of all tokens
          _mint(tokenOwnerAddress, totalSupply);
    
          // pay the service fee for contract deployment
          feeReceiver.transfer(msg.value);
        }
    
        /**
         * @dev Burns a specific amount of tokens.
         * @param value The amount of lowest token units to be burned.
         */
        function burn(uint256 value) public {
          _burn(msg.sender, value);
        }
    
        // optional functions from ERC20 stardard
    
        /**
         * @return the name of the token.
         */
        function name() public view returns (string memory) {
          return _name;
        }
    
        /**
         * @return the symbol of the token.
         */
        function symbol() public view returns (string memory) {
          return _symbol;
        }
    
        /**
         * @return the number of decimals of the token.
         */
        function decimals() public view returns (uint8) {
          return _decimals;
        }
    }
    
    contract Bundles is ReentrancyGuard {
        
        uint256 public bundleId = 1;
        address public owner;
        
        /* Bundle Token Address */
        
        TokenMintERC20Token public bundle_address;
        
        /* Variable to store the fee collected */
        
        uint256 public fee_collected;       
        
        /* Last Created Informations*/
        
        uint256 public lastcreated;
        uint256 lastbundlecreated;
    
        struct UserBets{
            uint256[10] bundles;
            uint256[10] amounts;
            uint256[10] prices;
            bool betted;
            uint256 balance;
            uint256 totalbet;
            bool claimed;
        }
        
        struct User{
            uint256[] bundles;
            string username;
            uint256 balance;
            uint256 freebal;
            bool active;
        }
        
        struct Data{
            address[] user;
        }
        
        struct Bundle{
            uint256[10] prices;
            uint256 startime;
            uint256 stakingends;
            uint256 endtime;
        }
        
        mapping(address => mapping(uint256 => UserBets)) bets;
        mapping(uint256 => Bundle) bundle;
        mapping(address => User) user;
        mapping(uint256 => Data) data;
        
        constructor(address _bundle_address) public{
            owner = msg.sender;
            bundle_address = TokenMintERC20Token(_bundle_address);
            lastcreated = block.timestamp;
        }
        
        /*  Registering the username to the contract */
        
        function Register(string memory _username) public returns(bool){
            User storage us = user[msg.sender];
            require(us.active == false,'Existing User');
            us.active = true;
            us.username = _username;
            return true;
        }
        
        /* For placing a prediction in the bundle. */
        
        function PlaceBet(uint256 index,uint256 _prices,uint256 _percent,uint256 _bundleId,uint256 _amount) public returns(bool){
            require(_bundleId <= bundleId,'Invalid Bundle');
            require(bundle_address.allowance(msg.sender,address(this))>=_amount,'Approval failed');
            Bundle storage b = bundle[_bundleId];
            Data storage d = data[_bundleId];
            require(b.stakingends >= block.timestamp,'Ended');
            User storage us = user[msg.sender];
            require(us.active == true,'Register to participate');
            UserBets storage u = bets[msg.sender][_bundleId];
            require(u.bundles[index] == 0,'Already Betted');
            if(u.betted == false){
                u.balance = bundle_address.balanceOf(msg.sender);
                u.betted = true;
            }
            else{
                require(SafeMath.add(u.totalbet,_amount) <= u.balance,'Threshold Reached');
            }
            us.bundles.push(_bundleId);
            us.balance = SafeMath.add(us.balance,_amount);
            u.bundles[index] = _percent; 
            u.prices[index] = _prices; 
            u.amounts[index] = _amount;
            u.totalbet = u.totalbet + _amount;
            d.user.push(msg.sender);
            bundle_address.transferFrom(msg.sender,address(this),_amount);
            return true;
        }
        
        /* Update user balance. Max 40% can be changed */
        
        function updatebal(address _user,uint256 _bundleId,uint256 _reward,bool _isPositive) public returns(bool){
            require(msg.sender == owner,'Not Owner');
            require(_reward <= 40000000,'Invalid Reward Percent'); 
            User storage us = user[_user];
            require(us.active == true,'Invalid User');
            UserBets storage u = bets[_user][_bundleId];
            require(u.claimed == false,'Already Claimed');
            if(_isPositive == true){
                updateFee(_reward,u.totalbet);
                uint256 temp = SafeMath.mul(_reward,90);
                uint256 reward = SafeMath.div(temp,100);
                uint256 a = SafeMath.mul(u.totalbet,reward);
                uint256 b = SafeMath.div(a,10**8);
                uint256 c = SafeMath.add(u.totalbet,b);
                u.claimed = true;
                us.freebal = SafeMath.add(c,us.freebal);
                us.balance = SafeMath.sub(us.balance,u.totalbet);
            }
            else{
                uint256 a = SafeMath.mul(u.totalbet,_reward);
                uint256 b = SafeMath.div(a,10**8);
                uint256 c = SafeMath.sub(u.totalbet,b);
                u.claimed = true;
                us.freebal = SafeMath.add(c,us.freebal);
                us.balance = SafeMath.sub(us.balance,u.totalbet);
            }
            return true;
        }
        
        /* Update the fee incurred */
        
        function updateFee(uint256 r,uint256 amt) internal{
            uint256 temp = SafeMath.mul(r,1);
            uint256 reward = SafeMath.div(temp,100);
            uint256 a = SafeMath.mul(amt,reward);
            uint256 b = SafeMath.div(a,10**8);
            fee_collected = SafeMath.add(fee_collected,b);
        }
        
        /* Create a new bundle after 3 days */
        
        function createBundle(uint256[10] memory _prices) public returns(bool){
            require(msg.sender == owner,'Not Owner');
            require( block.timestamp > lastbundlecreated +  2 days,'Cannot Create');
            Bundle storage b = bundle[bundleId];
            b.prices = _prices;
            b.startime = block.timestamp;
            lastbundlecreated = block.timestamp;
            lastcreated = block.timestamp;
            b.endtime = SafeMath.add(block.timestamp,2 days);
            b.stakingends = SafeMath.add(block.timestamp,1 days);
            bundleId = SafeMath.add(bundleId,1);
            return true;
        }
        
        /* Update new owner of the contract */
        
        function updateowner(address new_owner) public returns(bool){
            require(msg.sender == owner,'Not an Owner');
            owner = new_owner;
            return true;
        }
        
        /* Update the timestamp of the last creted bundle. this function cannot change the bundle time. Last created variable is for display sake. */
        
        function updatetime(uint256 _timestamp) public returns(bool){
            require(msg.sender == owner,'Not an owner');
            lastcreated =  _timestamp;
        }
        
        /* Allows the user to withdraw his claimable balance from the contract */
        
        function withdraw() public nonReentrant returns(bool){
           User storage us = user[msg.sender];
           require(us.active == true,'Invalid User'); 
           require(us.freebal > 0,'No bal');
           bundle_address.transfer(msg.sender,us.freebal);
           us.freebal = 0;
           return true;
        }
        
        /*  Fetch the information about user. His claimable balance, fixed balance & stuff */
         
        function fetchUser(address _user) public view returns(uint256[] memory _bundles,string memory username,uint256 claimable,uint256 staked_balance, bool active){
            User storage us = user[_user];
            return(us.bundles,us.username,us.freebal,us.balance,us.active);
        }
        
        /* Fetch the information of a BundleId */
        
        function fetchBundle(uint256 _bundleId) public view returns(uint256[10] memory _prices,uint256 _start,uint256 _end,uint256 _staking_ends){
            Bundle storage b = bundle[_bundleId];
            return(b.prices,b.startime,b.endtime,b.stakingends);
        }
        
        /* Fetch the prediction information of each user in each bundle. Pass bundleId and User Address to get the strike price as well as the amount in 18 decimals */
        
        function fetchUserBets(address _user, uint256 _bundleId) public view returns(uint256[10] memory _bundles,uint256[10] memory _prices,uint256[10] memory _amounts,uint256 balance,uint256 totalbet){
            UserBets storage u = bets[_user][_bundleId];
            return (u.bundles,u.prices,u.amounts,u.balance,u.totalbet);
        }
        
        /* Fetch all the user wallet predicted in a bundleId. Pass bundleId and will return an array of betters */
        
        function fetchUserInBundle(uint256 _bundleId) public view returns(address[] memory _betters){
            Data storage d = data[_bundleId];
            return d.user;
        }
        
        /*  
            Only Allow the Developer to withdraw the developer fee
        */
        
        function collectdeveloperfee() public nonReentrant returns(bool){
            require(msg.sender == owner,'To Be Claimed By Developer');
            bundle_address.transfer(msg.sender,fee_collected);
            fee_collected = 0;
            return true;
        }
        
    }
    

    Function Graph

    Smart Contract Graph

    Inheritence Chart

    Smart Contract Inheritance

    Functions Overview

    
    
     + [Int] IUniswapV2Pair 
        - [Ext] name
        - [Ext] symbol
        - [Ext] decimals
        - [Ext] totalSupply
        - [Ext] balanceOf
        - [Ext] allowance
        - [Ext] approve #
        - [Ext] transfer #
        - [Ext] transferFrom #
        - [Ext] DOMAIN_SEPARATOR
        - [Ext] PERMIT_TYPEHASH
        - [Ext] nonces
        - [Ext] permit #
        - [Ext] MINIMUM_LIQUIDITY
        - [Ext] factory
        - [Ext] token0
        - [Ext] token1
        - [Ext] getReserves
        - [Ext] price0CumulativeLast
        - [Ext] price1CumulativeLast
        - [Ext] kLast
        - [Ext] mint #
        - [Ext] burn #
        - [Ext] swap #
        - [Ext] skim #
        - [Ext] sync #
        - [Ext] initialize #
    
     + [Int] IUniswapV2ERC20 
        - [Ext] name
        - [Ext] symbol
        - [Ext] decimals
        - [Ext] totalSupply
        - [Ext] balanceOf
        - [Ext] allowance
        - [Ext] approve #
        - [Ext] transfer #
        - [Ext] transferFrom #
        - [Ext] DOMAIN_SEPARATOR
        - [Ext] PERMIT_TYPEHASH
        - [Ext] nonces
        - [Ext] permit #
    
     + [Lib] SafeMath 
        - [Int] add
        - [Int] sub
        - [Int] mul
        - [Int] div
    
     +  UniswapV2ERC20 (IUniswapV2ERC20)
        - [Pub]  #
        - [Int] _mint #
        - [Int] _burn #
        - [Prv] _approve #
        - [Prv] _transfer #
        - [Ext] approve #
        - [Ext] transfer #
        - [Ext] transferFrom #
        - [Ext] permit #
    
     + [Lib] Math 
        - [Int] min
        - [Int] sqrt
    
     + [Lib] UQ112x112 
        - [Int] encode
        - [Int] uqdiv
    
     + [Int] IERC20 
        - [Ext] name
        - [Ext] symbol
        - [Ext] decimals
        - [Ext] totalSupply
        - [Ext] balanceOf
        - [Ext] allowance
        - [Ext] approve #
        - [Ext] transfer #
        - [Ext] transferFrom #
    
     + [Int] IUniswapV2Factory 
        - [Ext] feeTo
        - [Ext] feeToSetter
        - [Ext] getPair
        - [Ext] allPairs
        - [Ext] allPairsLength
        - [Ext] createPair #
        - [Ext] setFeeTo #
        - [Ext] setFeeToSetter #
    
     + [Int] IUniswapV2Callee 
        - [Ext] uniswapV2Call #
    
     +  UniswapV2Pair (IUniswapV2Pair, UniswapV2ERC20)
        - [Pub] getReserves
        - [Prv] _safeTransfer #
        - [Pub]  #
        - [Ext] initialize #
        - [Prv] _update #
        - [Prv] _mintFee #
        - [Ext] mint #
           - modifiers: lock
        - [Ext] burn #
           - modifiers: lock
        - [Ext] swap #
           - modifiers: lock
        - [Ext] skim #
           - modifiers: lock
        - [Ext] sync #
           - modifiers: lock
    
     +  ERC20 (IERC20)
        - [Pub] totalSupply
        - [Pub] balanceOf
        - [Pub] transfer #
        - [Pub] allowance
        - [Pub] approve #
        - [Pub] transferFrom #
        - [Pub] increaseAllowance #
        - [Pub] decreaseAllowance #
        - [Int] _transfer #
        - [Int] _mint #
        - [Int] _burn #
        - [Int] _approve #
        - [Int] _burnFrom #
    
     +  TokenMintERC20Token (ERC20)
        - [Pub]  ($)
        - [Pub] burn #
        - [Pub] name
        - [Pub] symbol
        - [Pub] decimals
    
     +  Context 
        - [Int]  #
        - [Int] _msgSender
        - [Int] _msgData
    
     +  Ownable (Context)
        - [Int]  #
        - [Pub] owner
        - [Pub] isOwner
        - [Pub] renounceOwnership #
           - modifiers: onlyOwner
        - [Pub] transferOwnership #
           - modifiers: onlyOwner
        - [Int] _transferOwnership #
    
     + [Lib] Address 
        - [Int] isContract
        - [Int] toPayable
        - [Int] sendValue #
    
     + [Lib] SafeERC20 
        - [Int] safeTransfer #
        - [Int] safeTransferFrom #
        - [Int] safeApprove #
        - [Int] safeIncreaseAllowance #
        - [Int] safeDecreaseAllowance #
        - [Prv] callOptionalReturn #
    
     +  IRewardDistributionRecipient (Ownable)
        - [Ext] notifyRewardAmount #
        - [Ext] setRewardDistribution #
           - modifiers: onlyOwner
    
     +  LPTokenWrapper 
        - [Pub] totalSupply
        - [Pub] balanceOf
        - [Pub] stake #
        - [Pub] withdraw #
    
     +  BundEthPool (LPTokenWrapper, IRewardDistributionRecipient)
        - [Pub] lastTimeRewardApplicable
        - [Pub] rewardPerToken
        - [Pub] earned
        - [Pub] collectRewardAmount #
           - modifiers: onlyOwner
        - [Pub] stake #
           - modifiers: updateReward,checkStart
        - [Pub] withdraw #
           - modifiers: updateReward,checkStart
        - [Ext] exit #
        - [Pub] getReward #
           - modifiers: updateReward,checkStart
        - [Ext] notifyRewardAmount #
           - modifiers: onlyRewardDistribution,updateReward
    
    							

    Source Code

    Click here to download the source code as a .sol file.

    
    
    // File: contracts/interfaces/IUniswapV2Pair.sol
    
    pragma solidity >=0.5.0;
    
    interface IUniswapV2Pair {
        event Approval(address indexed owner, address indexed spender, uint value);
        event Transfer(address indexed from, address indexed to, uint value);
    
        function name() external pure returns (string memory);
        function symbol() external pure returns (string memory);
        function decimals() external pure returns (uint8);
        function totalSupply() external view returns (uint);
        function balanceOf(address owner) external view returns (uint);
        function allowance(address owner, address spender) external view returns (uint);
    
        function approve(address spender, uint value) external returns (bool);
        function transfer(address to, uint value) external returns (bool);
        function transferFrom(address from, address to, uint value) external returns (bool);
    
        function DOMAIN_SEPARATOR() external view returns (bytes32);
        function PERMIT_TYPEHASH() external pure returns (bytes32);
        function nonces(address owner) external view returns (uint);
    
        function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
    
        event Mint(address indexed sender, uint amount0, uint amount1);
        event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
        event Swap(
            address indexed sender,
            uint amount0In,
            uint amount1In,
            uint amount0Out,
            uint amount1Out,
            address indexed to
        );
        event Sync(uint112 reserve0, uint112 reserve1);
    
        function MINIMUM_LIQUIDITY() external pure returns (uint);
        function factory() external view returns (address);
        function token0() external view returns (address);
        function token1() external view returns (address);
        function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
        function price0CumulativeLast() external view returns (uint);
        function price1CumulativeLast() external view returns (uint);
        function kLast() external view returns (uint);
    
        function mint(address to) external returns (uint liquidity);
        function burn(address to) external returns (uint amount0, uint amount1);
        function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
        function skim(address to) external;
        function sync() external;
    
        function initialize(address, address) external;
    }
    
    // File: contracts/interfaces/IUniswapV2ERC20.sol
    
    pragma solidity >=0.5.0;
    
    interface IUniswapV2ERC20 {
        event Approval(address indexed owner, address indexed spender, uint value);
        event Transfer(address indexed from, address indexed to, uint value);
    
        function name() external pure returns (string memory);
        function symbol() external pure returns (string memory);
        function decimals() external pure returns (uint8);
        function totalSupply() external view returns (uint);
        function balanceOf(address owner) external view returns (uint);
        function allowance(address owner, address spender) external view returns (uint);
    
        function approve(address spender, uint value) external returns (bool);
        function transfer(address to, uint value) external returns (bool);
        function transferFrom(address from, address to, uint value) external returns (bool);
    
        function DOMAIN_SEPARATOR() external view returns (bytes32);
        function PERMIT_TYPEHASH() external pure returns (bytes32);
        function nonces(address owner) external view returns (uint);
    
        function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
    }
    
    // File: contracts/libraries/SafeMath.sol
    
    pragma solidity =0.5.16;
    
    // a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)
    
    library SafeMath {
        function add(uint x, uint y) internal pure returns (uint z) {
            require((z = x + y) >= x, 'ds-math-add-overflow');
        }
    
        function sub(uint x, uint y) internal pure returns (uint z) {
            require((z = x - y) <= x, 'ds-math-sub-underflow');
        }
    
        function mul(uint x, uint y) internal pure returns (uint z) {
            require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
        }
        
        function div(uint256 a, uint256 b) internal pure returns (uint256) {
            return div(a, b);
        }
    }
    
    // File: contracts/UniswapV2ERC20.sol
    
    pragma solidity =0.5.16;
    
    
    
    contract UniswapV2ERC20 is IUniswapV2ERC20 {
        using SafeMath for uint;
    
        string public constant name = 'Uniswap V2';
        string public constant symbol = 'UNI-V2';
        uint8 public constant decimals = 18;
        uint  public totalSupply;
        mapping(address => uint) public balanceOf;
        mapping(address => mapping(address => uint)) public allowance;
    
        bytes32 public DOMAIN_SEPARATOR;
        // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
        bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
        mapping(address => uint) public nonces;
    
        event Approval(address indexed owner, address indexed spender, uint value);
        event Transfer(address indexed from, address indexed to, uint value);
    
        constructor() public {
            uint chainId;
            assembly {
                chainId := chainid
            }
            DOMAIN_SEPARATOR = keccak256(
                abi.encode(
                    keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
                    keccak256(bytes(name)),
                    keccak256(bytes('1')),
                    chainId,
                    address(this)
                )
            );
        }
    
        function _mint(address to, uint value) internal {
            totalSupply = totalSupply.add(value);
            balanceOf[to] = balanceOf[to].add(value);
            emit Transfer(address(0), to, value);
        }
    
        function _burn(address from, uint value) internal {
            balanceOf[from] = balanceOf[from].sub(value);
            totalSupply = totalSupply.sub(value);
            emit Transfer(from, address(0), value);
        }
    
        function _approve(address owner, address spender, uint value) private {
            allowance[owner][spender] = value;
            emit Approval(owner, spender, value);
        }
    
        function _transfer(address from, address to, uint value) private {
            balanceOf[from] = balanceOf[from].sub(value);
            balanceOf[to] = balanceOf[to].add(value);
            emit Transfer(from, to, value);
        }
    
        function approve(address spender, uint value) external returns (bool) {
            _approve(msg.sender, spender, value);
            return true;
        }
    
        function transfer(address to, uint value) external returns (bool) {
            _transfer(msg.sender, to, value);
            return true;
        }
    
        function transferFrom(address from, address to, uint value) external returns (bool) {
            if (allowance[from][msg.sender] != uint(-1)) {
                allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
            }
            _transfer(from, to, value);
            return true;
        }
    
        function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
            require(deadline >= block.timestamp, 'UniswapV2: EXPIRED');
            bytes32 digest = keccak256(
                abi.encodePacked(
                    '\x19\x01',
                    DOMAIN_SEPARATOR,
                    keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
                )
            );
            address recoveredAddress = ecrecover(digest, v, r, s);
            require(recoveredAddress != address(0) && recoveredAddress == owner, 'UniswapV2: INVALID_SIGNATURE');
            _approve(owner, spender, value);
        }
    }
    
    // File: contracts/libraries/Math.sol
    
    pragma solidity =0.5.16;
    
    // a library for performing various math operations
    
    library Math {
        function min(uint x, uint y) internal pure returns (uint z) {
            z = x < y ? x : y;
        }
    
        // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
        function sqrt(uint y) internal pure returns (uint z) {
            if (y > 3) {
                z = y;
                uint x = y / 2 + 1;
                while (x < z) {
                    z = x;
                    x = (y / x + x) / 2;
                }
            } else if (y != 0) {
                z = 1;
            }
        }
    }
    
    // File: contracts/libraries/UQ112x112.sol
    
    pragma solidity =0.5.16;
    
    // a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))
    
    // range: [0, 2**112 - 1]
    // resolution: 1 / 2**112
    
    library UQ112x112 {
        uint224 constant Q112 = 2**112;
    
        // encode a uint112 as a UQ112x112
        function encode(uint112 y) internal pure returns (uint224 z) {
            z = uint224(y) * Q112; // never overflows
        }
    
        // divide a UQ112x112 by a uint112, returning a UQ112x112
        function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
            z = x / uint224(y);
        }
    }
    
    // File: contracts/interfaces/IERC20.sol
    
    pragma solidity >=0.5.0;
    
    interface IERC20 {
        event Approval(address indexed owner, address indexed spender, uint value);
        event Transfer(address indexed from, address indexed to, uint value);
    
        function name() external view returns (string memory);
        function symbol() external view returns (string memory);
        function decimals() external view returns (uint8);
        function totalSupply() external view returns (uint);
        function balanceOf(address owner) external view returns (uint);
        function allowance(address owner, address spender) external view returns (uint);
    
        function approve(address spender, uint value) external returns (bool);
        function transfer(address to, uint value) external returns (bool);
        function transferFrom(address from, address to, uint value) external returns (bool);
    }
    
    // File: contracts/interfaces/IUniswapV2Factory.sol
    
    pragma solidity >=0.5.0;
    
    interface IUniswapV2Factory {
        event PairCreated(address indexed token0, address indexed token1, address pair, uint);
    
        function feeTo() external view returns (address);
        function feeToSetter() external view returns (address);
    
        function getPair(address tokenA, address tokenB) external view returns (address pair);
        function allPairs(uint) external view returns (address pair);
        function allPairsLength() external view returns (uint);
    
        function createPair(address tokenA, address tokenB) external returns (address pair);
    
        function setFeeTo(address) external;
        function setFeeToSetter(address) external;
    }
    
    // File: contracts/interfaces/IUniswapV2Callee.sol
    
    pragma solidity >=0.5.0;
    
    interface IUniswapV2Callee {
        function uniswapV2Call(address sender, uint amount0, uint amount1, bytes calldata data) external;
    }
    
    // File: contracts/UniswapV2Pair.sol
    
    pragma solidity =0.5.16;
    
    
    
    
    
    
    
    
    contract UniswapV2Pair is IUniswapV2Pair, UniswapV2ERC20 {
        using SafeMath  for uint;
        using UQ112x112 for uint224;
    
        uint public constant MINIMUM_LIQUIDITY = 10**3;
        bytes4 private constant SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)')));
    
        address public factory;
        address public token0;
        address public token1;
    
        uint112 private reserve0;           // uses single storage slot, accessible via getReserves
        uint112 private reserve1;           // uses single storage slot, accessible via getReserves
        uint32  private blockTimestampLast; // uses single storage slot, accessible via getReserves
    
        uint public price0CumulativeLast;
        uint public price1CumulativeLast;
        uint public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event
    
        uint private unlocked = 1;
        modifier lock() {
            require(unlocked == 1, 'UniswapV2: LOCKED');
            unlocked = 0;
            _;
            unlocked = 1;
        }
    
        function getReserves() public view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast) {
            _reserve0 = reserve0;
            _reserve1 = reserve1;
            _blockTimestampLast = blockTimestampLast;
        }
    
        function _safeTransfer(address token, address to, uint value) private {
            (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
            require(success && (data.length == 0 || abi.decode(data, (bool))), 'UniswapV2: TRANSFER_FAILED');
        }
    
        event Mint(address indexed sender, uint amount0, uint amount1);
        event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
        event Swap(
            address indexed sender,
            uint amount0In,
            uint amount1In,
            uint amount0Out,
            uint amount1Out,
            address indexed to
        );
        event Sync(uint112 reserve0, uint112 reserve1);
    
        constructor() public {
            factory = msg.sender;
        }
    
        // called once by the factory at time of deployment
        function initialize(address _token0, address _token1) external {
            require(msg.sender == factory, 'UniswapV2: FORBIDDEN'); // sufficient check
            token0 = _token0;
            token1 = _token1;
        }
    
        // update reserves and, on the first call per block, price accumulators
        function _update(uint balance0, uint balance1, uint112 _reserve0, uint112 _reserve1) private {
            require(balance0 <= uint112(-1) && balance1 <= uint112(-1), 'UniswapV2: OVERFLOW');
            uint32 blockTimestamp = uint32(block.timestamp % 2**32);
            uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
            if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
                // * never overflows, and + overflow is desired
                price0CumulativeLast += uint(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
                price1CumulativeLast += uint(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
            }
            reserve0 = uint112(balance0);
            reserve1 = uint112(balance1);
            blockTimestampLast = blockTimestamp;
            emit Sync(reserve0, reserve1);
        }
    
        // if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k)
        function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
            address feeTo = IUniswapV2Factory(factory).feeTo();
            feeOn = feeTo != address(0);
            uint _kLast = kLast; // gas savings
            if (feeOn) {
                if (_kLast != 0) {
                    uint rootK = Math.sqrt(uint(_reserve0).mul(_reserve1));
                    uint rootKLast = Math.sqrt(_kLast);
                    if (rootK > rootKLast) {
                        uint numerator = totalSupply.mul(rootK.sub(rootKLast));
                        uint denominator = rootK.mul(5).add(rootKLast);
                        uint liquidity = numerator / denominator;
                        if (liquidity > 0) _mint(feeTo, liquidity);
                    }
                }
            } else if (_kLast != 0) {
                kLast = 0;
            }
        }
    
        // this low-level function should be called from a contract which performs important safety checks
        function mint(address to) external lock returns (uint liquidity) {
            (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
            uint balance0 = IERC20(token0).balanceOf(address(this));
            uint balance1 = IERC20(token1).balanceOf(address(this));
            uint amount0 = balance0.sub(_reserve0);
            uint amount1 = balance1.sub(_reserve1);
    
            bool feeOn = _mintFee(_reserve0, _reserve1);
            uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
            if (_totalSupply == 0) {
                liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
               _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
            } else {
                liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
            }
            require(liquidity > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_MINTED');
            _mint(to, liquidity);
    
            _update(balance0, balance1, _reserve0, _reserve1);
            if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
            emit Mint(msg.sender, amount0, amount1);
        }
    
        // this low-level function should be called from a contract which performs important safety checks
        function burn(address to) external lock returns (uint amount0, uint amount1) {
            (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
            address _token0 = token0;                                // gas savings
            address _token1 = token1;                                // gas savings
            uint balance0 = IERC20(_token0).balanceOf(address(this));
            uint balance1 = IERC20(_token1).balanceOf(address(this));
            uint liquidity = balanceOf[address(this)];
    
            bool feeOn = _mintFee(_reserve0, _reserve1);
            uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
            amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution
            amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution
            require(amount0 > 0 && amount1 > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_BURNED');
            _burn(address(this), liquidity);
            _safeTransfer(_token0, to, amount0);
            _safeTransfer(_token1, to, amount1);
            balance0 = IERC20(_token0).balanceOf(address(this));
            balance1 = IERC20(_token1).balanceOf(address(this));
    
            _update(balance0, balance1, _reserve0, _reserve1);
            if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
            emit Burn(msg.sender, amount0, amount1, to);
        }
    
        // this low-level function should be called from a contract which performs important safety checks
        function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock {
            require(amount0Out > 0 || amount1Out > 0, 'UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT');
            (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
            require(amount0Out < _reserve0 && amount1Out < _reserve1, 'UniswapV2: INSUFFICIENT_LIQUIDITY');
    
            uint balance0;
            uint balance1;
            { // scope for _token{0,1}, avoids stack too deep errors
            address _token0 = token0;
            address _token1 = token1;
            require(to != _token0 && to != _token1, 'UniswapV2: INVALID_TO');
            if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
            if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
            if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);
            balance0 = IERC20(_token0).balanceOf(address(this));
            balance1 = IERC20(_token1).balanceOf(address(this));
            }
            uint amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
            uint amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
            require(amount0In > 0 || amount1In > 0, 'UniswapV2: INSUFFICIENT_INPUT_AMOUNT');
            { // scope for reserve{0,1}Adjusted, avoids stack too deep errors
            uint balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3));
            uint balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3));
            require(balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(1000**2), 'UniswapV2: K');
            }
    
            _update(balance0, balance1, _reserve0, _reserve1);
            emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
        }
    
        // force balances to match reserves
        function skim(address to) external lock {
            address _token0 = token0; // gas savings
            address _token1 = token1; // gas savings
            _safeTransfer(_token0, to, IERC20(_token0).balanceOf(address(this)).sub(reserve0));
            _safeTransfer(_token1, to, IERC20(_token1).balanceOf(address(this)).sub(reserve1));
        }
    
        // force reserves to match balances
        function sync() external lock {
            _update(IERC20(token0).balanceOf(address(this)), IERC20(token1).balanceOf(address(this)), reserve0, reserve1);
        }
    }
    
    // File: contracts\open-zeppelin-contracts\token\ERC20\IERC20.sol
    
    pragma solidity ^0.5.0;
    
    /**
     * @dev Wrappers over Solidity's arithmetic operations with added overflow
     * checks.
     *
     * Arithmetic operations in Solidity wrap on overflow. This can easily result
     * in bugs, because programmers usually assume that an overflow raises an
     * error, which is the standard behavior in high level programming languages.
     * `SafeMath` restores this intuition by reverting the transaction when an
     * operation overflows.
     *
     * Using this library instead of the unchecked operations eliminates an entire
     * class of bugs, so it's recommended to use it always.
     */
    
    // File: contracts\open-zeppelin-contracts\token\ERC20\ERC20.sol
    
    pragma solidity ^0.5.0;
    
    
    
    /**
     * @dev Implementation of the `IERC20` interface.
     *
     * This implementation is agnostic to the way tokens are created. This means
     * that a supply mechanism has to be added in a derived contract using `_mint`.
     * For a generic mechanism see `ERC20Mintable`.
     *
     * *For a detailed writeup see our guide [How to implement supply
     * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
     *
     * We have followed general OpenZeppelin guidelines: functions revert instead
     * of returning `false` on failure. This behavior is nonetheless conventional
     * and does not conflict with the expectations of ERC20 applications.
     *
     * Additionally, an `Approval` event is emitted on calls to `transferFrom`.
     * This allows applications to reconstruct the allowance for all accounts just
     * by listening to said events. Other implementations of the EIP may not emit
     * these events, as it isn't required by the specification.
     *
     * Finally, the non-standard `decreaseAllowance` and `increaseAllowance`
     * functions have been added to mitigate the well-known issues around setting
     * allowances. See `IERC20.approve`.
     */
    contract ERC20 is IERC20 {
        using SafeMath for uint256;
    
        mapping (address => uint256) private _balances;
    
        mapping (address => mapping (address => uint256)) private _allowances;
    
        uint256 private _totalSupply;
    
        /**
         * @dev See `IERC20.totalSupply`.
         */
        function totalSupply() public view returns (uint256) {
            return _totalSupply;
        }
    
        /**
         * @dev See `IERC20.balanceOf`.
         */
        function balanceOf(address account) public view returns (uint256) {
            return _balances[account];
        }
    
        /**
         * @dev See `IERC20.transfer`.
         *
         * Requirements:
         *
         * - `recipient` cannot be the zero address.
         * - the caller must have a balance of at least `amount`.
         */
        function transfer(address recipient, uint256 amount) public returns (bool) {
            _transfer(msg.sender, recipient, amount);
            return true;
        }
    
        /**
         * @dev See `IERC20.allowance`.
         */
        function allowance(address owner, address spender) public view returns (uint256) {
            return _allowances[owner][spender];
        }
    
        /**
         * @dev See `IERC20.approve`.
         *
         * Requirements:
         *
         * - `spender` cannot be the zero address.
         */
        function approve(address spender, uint256 value) public returns (bool) {
            _approve(msg.sender, spender, value);
            return true;
        }
    
        /**
         * @dev See `IERC20.transferFrom`.
         *
         * Emits an `Approval` event indicating the updated allowance. This is not
         * required by the EIP. See the note at the beginning of `ERC20`;
         *
         * Requirements:
         * - `sender` and `recipient` cannot be the zero address.
         * - `sender` must have a balance of at least `value`.
         * - the caller must have allowance for `sender`'s tokens of at least
         * `amount`.
         */
        function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
            _transfer(sender, recipient, amount);
            _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
            return true;
        }
    
        /**
         * @dev Atomically increases the allowance granted to `spender` by the caller.
         *
         * This is an alternative to `approve` that can be used as a mitigation for
         * problems described in `IERC20.approve`.
         *
         * Emits an `Approval` event indicating the updated allowance.
         *
         * Requirements:
         *
         * - `spender` cannot be the zero address.
         */
        function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
            _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
            return true;
        }
    
        /**
         * @dev Atomically decreases the allowance granted to `spender` by the caller.
         *
         * This is an alternative to `approve` that can be used as a mitigation for
         * problems described in `IERC20.approve`.
         *
         * Emits an `Approval` event indicating the updated allowance.
         *
         * Requirements:
         *
         * - `spender` cannot be the zero address.
         * - `spender` must have allowance for the caller of at least
         * `subtractedValue`.
         */
        function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
            _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
            return true;
        }
    
        /**
         * @dev Moves tokens `amount` from `sender` to `recipient`.
         *
         * This is internal function is equivalent to `transfer`, and can be used to
         * e.g. implement automatic token fees, slashing mechanisms, etc.
         *
         * Emits a `Transfer` event.
         *
         * Requirements:
         *
         * - `sender` cannot be the zero address.
         * - `recipient` cannot be the zero address.
         * - `sender` must have a balance of at least `amount`.
         */
        function _transfer(address sender, address recipient, uint256 amount) internal {
            require(sender != address(0), "ERC20: transfer from the zero address");
            require(recipient != address(0), "ERC20: transfer to the zero address");
    
            _balances[sender] = _balances[sender].sub(amount);
            _balances[recipient] = _balances[recipient].add(amount);
            emit Transfer(sender, recipient, amount);
        }
    
        /** @dev Creates `amount` tokens and assigns them to `account`, increasing
         * the total supply.
         *
         * Emits a `Transfer` event with `from` set to the zero address.
         *
         * Requirements
         *
         * - `to` cannot be the zero address.
         */
        function _mint(address account, uint256 amount) internal {
            require(account != address(0), "ERC20: mint to the zero address");
    
            _totalSupply = _totalSupply.add(amount);
            _balances[account] = _balances[account].add(amount);
            emit Transfer(address(0), account, amount);
        }
    
         /**
         * @dev Destroys `amount` tokens from `account`, reducing the
         * total supply.
         *
         * Emits a `Transfer` event with `to` set to the zero address.
         *
         * Requirements
         *
         * - `account` cannot be the zero address.
         * - `account` must have at least `amount` tokens.
         */
        function _burn(address account, uint256 value) internal {
            require(account != address(0), "ERC20: burn from the zero address");
    
            _totalSupply = _totalSupply.sub(value);
            _balances[account] = _balances[account].sub(value);
            emit Transfer(account, address(0), value);
        }
    
        /**
         * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
         *
         * This is internal function is equivalent to `approve`, and can be used to
         * e.g. set automatic allowances for certain subsystems, etc.
         *
         * Emits an `Approval` event.
         *
         * Requirements:
         *
         * - `owner` cannot be the zero address.
         * - `spender` cannot be the zero address.
         */
        function _approve(address owner, address spender, uint256 value) internal {
            require(owner != address(0), "ERC20: approve from the zero address");
            require(spender != address(0), "ERC20: approve to the zero address");
    
            _allowances[owner][spender] = value;
            emit Approval(owner, spender, value);
        }
    
        /**
         * @dev Destoys `amount` tokens from `account`.`amount` is then deducted
         * from the caller's allowance.
         *
         * See `_burn` and `_approve`.
         */
        function _burnFrom(address account, uint256 amount) internal {
            _burn(account, amount);
            _approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));
        }
    }
    
    // File: contracts\ERC20\TokenMintERC20Token.sol
    
    pragma solidity ^0.5.0;
    
    
    /**
     * @title TokenMintERC20Token
     * @author TokenMint (visit https://tokenmint.io)
     *
     * @dev Standard ERC20 token with burning and optional functions implemented.
     * For full specification of ERC-20 standard see:
     * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
     */
    contract TokenMintERC20Token is ERC20 {
    
        string private _name;
        string private _symbol;
        uint8 private _decimals;
    
        /**
         * @dev Constructor.
         * @param name name of the token
         * @param symbol symbol of the token, 3-4 chars is recommended
         * @param decimals number of decimal places of one token unit, 18 is widely used
         * @param totalSupply total supply of tokens in lowest units (depending on decimals)
         * @param tokenOwnerAddress address that gets 100% of token supply
         */
        constructor(string memory name, string memory symbol, uint8 decimals, uint256 totalSupply, address payable feeReceiver, address tokenOwnerAddress) public payable {
          _name = name;
          _symbol = symbol;
          _decimals = decimals;
    
          // set tokenOwnerAddress as owner of all tokens
          _mint(tokenOwnerAddress, totalSupply);
    
          // pay the service fee for contract deployment
          feeReceiver.transfer(msg.value);
        }
    
        /**
         * @dev Burns a specific amount of tokens.
         * @param value The amount of lowest token units to be burned.
         */
        function burn(uint256 value) public {
          _burn(msg.sender, value);
        }
    
        // optional functions from ERC20 stardard
    
        /**
         * @return the name of the token.
         */
        function name() public view returns (string memory) {
          return _name;
        }
    
        /**
         * @return the symbol of the token.
         */
        function symbol() public view returns (string memory) {
          return _symbol;
        }
    
        /**
         * @return the number of decimals of the token.
         */
        function decimals() public view returns (uint8) {
          return _decimals;
        }
    }
    
    
    
    contract Context {
    
        constructor () internal { }
       
        function _msgSender() internal view returns (address payable) {
            return msg.sender;
        }
    
        function _msgData() internal view returns (bytes memory) {
            this; 
            return msg.data;
        }
    }
    
    contract Ownable is Context {
        address private _owner;
    
        event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    
        constructor () internal {
            _owner = _msgSender();
            emit OwnershipTransferred(address(0), _owner);
        }
    
        function owner() public view returns (address) {
            return _owner;
        }
    
    
        modifier onlyOwner() {
            require(isOwner(), "Ownable: caller is not the owner");
            _;
        }
    
        function isOwner() public view returns (bool) {
            return _msgSender() == _owner;
        }
    
        function renounceOwnership() public onlyOwner {
            emit OwnershipTransferred(_owner, address(0));
            _owner = address(0);
        }
    
        function transferOwnership(address newOwner) public onlyOwner {
            _transferOwnership(newOwner);
        }
    
    
        function _transferOwnership(address newOwner) internal {
            require(newOwner != address(0), "Ownable: new owner is the zero address");
            emit OwnershipTransferred(_owner, newOwner);
            _owner = newOwner;
        }
    }
    
    library Address {
    
        function isContract(address account) internal view returns (bool) {
            bytes32 codehash;
            bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
         
            assembly { codehash := extcodehash(account) }
            return (codehash != 0x0 && codehash != accountHash);
        }
    
        function toPayable(address account) internal pure returns (address payable) {
            return address(uint160(account));
        }
    
    
        function sendValue(address payable recipient, uint256 amount) internal {
            require(address(this).balance >= amount, "Address: insufficient balance");
    
            
            (bool success, ) = recipient.call.value(amount)("");
            require(success, "Address: unable to send value, recipient may have reverted");
        }
    }
    
    library SafeERC20 {
        using SafeMath for uint256;
        using Address for address;
    
        function safeTransfer(IERC20 token, address to, uint256 value) internal {
            callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
        }
    
        function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
            callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
        }
    
        function safeApprove(IERC20 token, address spender, uint256 value) internal {
            require((value == 0) || (token.allowance(address(this), spender) == 0),
                "SafeERC20: approve from non-zero to non-zero allowance"
            );
            callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
        }
    
        function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
            uint256 newAllowance = token.allowance(address(this), spender).add(value);
            callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    
      function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
      )
        internal
      {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value);
        require(token.approve(spender, newAllowance));
    }
    
        function callOptionalReturn(IERC20 token, bytes memory data) private {
            require(address(token).isContract(), "SafeERC20: call to non-contract");
    
    
            (bool success, bytes memory returndata) = address(token).call(data);
            require(success, "SafeERC20: low-level call failed");
    
            if (returndata.length > 0) { // Return data is optional
             
                require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
            }
        }
    }
    
    contract IRewardDistributionRecipient is Ownable {
        address public rewardDistribution;
    
        function notifyRewardAmount(uint256 reward) external;
    
        modifier onlyRewardDistribution() {
            require(_msgSender() == rewardDistribution, "Caller is not reward distribution");
            _;
        }
    
        function setRewardDistribution(address _rewardDistribution)
            external
            onlyOwner
        {
            rewardDistribution = _rewardDistribution;
        }
    }
    
    contract LPTokenWrapper {
        using SafeMath for uint256;
        using SafeERC20 for IERC20;
    
        IERC20 public BUND_ETH_LP = IERC20(0xEd86244cd91f4072C7c5b7F8Ec3A2E97EA31B693);
    
        uint256 private _totalSupply;
        mapping(address => uint256) private _balances;
    
        function totalSupply() public view returns (uint256) {
            return _totalSupply;
        }
    
        function balanceOf(address account) public view returns (uint256) {
            return _balances[account];
        }
    
        function stake(uint256 amount) public {
            _totalSupply = _totalSupply.add(amount);
            _balances[msg.sender] = _balances[msg.sender].add(amount);
            BUND_ETH_LP.safeTransferFrom(msg.sender, address(this), amount);
        }
    
        function withdraw(uint256 amount) public {
            _totalSupply = _totalSupply.sub(amount);
            _balances[msg.sender] = _balances[msg.sender].sub(amount);
            BUND_ETH_LP.safeTransfer(msg.sender, amount);
        }
    }
    
    contract BundEthPool is LPTokenWrapper, IRewardDistributionRecipient {
        IERC20 public bund = IERC20(0x8D3E855f3f55109D473735aB76F753218400fe96);
        uint256 public constant DURATION = 2419200;         // -----2419200:  4 Weeks -----
    
        uint256 public starttime = block.timestamp;        // ---- starts when deployed ---- 
        uint256 public periodFinish = 0;
        uint256 public rewardRate = 0;
        uint256 public lastUpdateTime;
        uint256 public rewardPerTokenStored;
        uint256 public rewardInterval = 86400;              // ------ 86400 : 24 hours -------
    
        mapping(address => uint256) public userRewardPerTokenPaid;
        mapping(address => uint256) public rewards;
        mapping(address => uint256) public lastTimeRewarded;
    
    
        event RewardAdded(uint256 reward);
        event Staked(address indexed user, uint256 amount);
        event Withdrawn(address indexed user, uint256 amount);
        event RewardPaid(address indexed user, uint256 reward);
    
        modifier checkStart(){
            require(block.timestamp >= starttime,"BUND-ETH Pool not started yet.");
            _;
        }
    
        modifier updateReward(address account) {
            rewardPerTokenStored = rewardPerToken();
            lastUpdateTime = lastTimeRewardApplicable();
            if (account != address(0)) {
                rewards[account] = earned(account);
                userRewardPerTokenPaid[account] = rewardPerTokenStored;
            }
            _;
        }
    
        function lastTimeRewardApplicable() public view returns (uint256) {
            return Math.min(block.timestamp, periodFinish);
        }
    
        function rewardPerToken() public view returns (uint256) {
            if (totalSupply() == 0) {
                return rewardPerTokenStored;
            }
            return
                rewardPerTokenStored.add(
                    lastTimeRewardApplicable()
                        .sub(lastUpdateTime)
                        .mul(rewardRate)
                        .mul(1e18)
                        .div(totalSupply())
                );
        }
    
        function earned(address account) public view returns (uint256) {
            return
                balanceOf(account)
                    .mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
                    .div(1e18)
                    .add(rewards[account]);
        }
    
        function collectRewardAmount() public onlyOwner {
                bund.safeTransfer(msg.sender, bund.balanceOf(address(this)));
        }
    
        function stake(uint256 amount) public updateReward(msg.sender) checkStart {
            require(amount > 0, "Cannot stake 0");
            super.stake(amount);
            emit Staked(msg.sender, amount);
        }
    
        function withdraw(uint256 amount) public updateReward(msg.sender) checkStart {
            require(amount > 0, "Cannot withdraw 0");
            uint256 unstakeDuration =  starttime.add(DURATION);
            require(block.timestamp >= unstakeDuration , "Can remove stake once 4 week is over");
            
            super.withdraw(amount);
            emit Withdrawn(msg.sender, amount);
        }
    
        function exit() external {
            withdraw(balanceOf(msg.sender));
            getReward();
        }
    
        function getReward() public updateReward(msg.sender) checkStart {
            uint256 reward = earned(msg.sender);
           
            uint256 leftTimeReward = block.timestamp.sub(lastTimeRewarded[msg.sender]);
            require(leftTimeReward >= rewardInterval , "Can claim reward once 24 hour is completed");
           
            if (reward > 0) {
                rewards[msg.sender] = 0; 
                uint256 trueReward = reward;
                bund.safeTransfer(msg.sender, trueReward);
                lastTimeRewarded[msg.sender] = block.timestamp; 
                emit RewardPaid(msg.sender, trueReward);
            }
        }
    
        function notifyRewardAmount(uint256 reward)
            external
            onlyRewardDistribution
            updateReward(address(0))
        {
            if (block.timestamp > starttime) {
              if (block.timestamp >= periodFinish) {
                  rewardRate = reward.div(DURATION);
              } else {
                  uint256 remaining = periodFinish.sub(block.timestamp);
                  uint256 leftover = remaining.mul(rewardRate);
                  rewardRate = reward.add(leftover).div(DURATION);
              }
              lastUpdateTime = block.timestamp;
              periodFinish = block.timestamp.add(DURATION);
              emit RewardAdded(reward);
            } else {
              rewardRate = reward.div(DURATION);
              lastUpdateTime = starttime;
              periodFinish = starttime.add(DURATION);
              emit RewardAdded(reward);
            }
        }
    }
    
    
    

    Function Graph

    Smart Contract Graph

    Functions Overview

    
    
     ($) = payable function
     # = non-constant function
     
     Int = Internal
     Ext = External
     Pub = Public
    
     +  Oracle 
        - [Pub]  #
        - [Pub] updateOwner #
        - [Pub] updateBtc #
        - [Pub] updateEth #
        - [Pub] updateXrp #
        - [Pub] updateDot #
        - [Pub] updateLink #
        - [Pub] updateYfi #
        - [Pub] updateCore #
        - [Pub] updateBnb #
        - [Pub] updateUni #
        - [Pub] updateUsdt #
    							

    Source Code

    Click here to download the source code as a .sol file.

    
    /**
     *Submitted for verification at Etherscan.io on 2020-11-12
    */
    
    // SPDX-License-Identifier: UNLICENSED
    
    pragma solidity <=0.7.4;
    
    contract Oracle{
        
        uint256 public BTC;
        uint256 public ETH;
        uint256 public DOT;
        uint256 public LINK;
        uint256 public XRP;
        uint256 public YFI;
        uint256 public CORE;
        uint256 public BNB;
        uint256 public UNI;
        uint256 public USDT;
        
        
        address public owner;
        
        constructor(){
            owner = msg.sender;
        }
        
        function updateOwner(address new_owner) public {
            require(msg.sender == owner);
            owner = new_owner;
        }
        
        function updateBtc(uint256 price) public {
            require(msg.sender==owner,'Cannot do this');
            BTC = price;
        }
        
        function updateEth(uint256 price) public {
            require(msg.sender==owner,'Cannot do this');
            ETH = price;
        }
        
        function updateXrp(uint256 price) public {
            require(msg.sender==owner,'Cannot do this');
            XRP = price;
        }
        
        function updateDot(uint256 price) public {
            require(msg.sender==owner,'Cannot do this');
            DOT = price;
        }
        
        function updateLink(uint256 price) public {
            require(msg.sender==owner,'Cannot do this');
            LINK = price;
        }
        
        function updateYfi(uint256 price) public {
            require(msg.sender==owner,'Cannot do this');
            YFI = price;
        }
        
        function updateCore(uint256 price) public {
            require(msg.sender==owner,'Cannot do this');
            CORE = price;
        }
        
        function updateBnb(uint256 price) public {
            require(msg.sender==owner,'Cannot do this');
            BNB = price;
        }
        
        function updateUni(uint256 price) public {
            require(msg.sender==owner,'Cannot do this');
            UNI = price;
        }
        
        function updateUsdt(uint256 price) public {
            require(msg.sender==owner,'Cannot do this');
            USDT = price;
        }
        
    }