Smart Contract Audit Report
Accept Crypto is a new automatic liquidity providing protocol that features a buyback mechanism for decreasing the circulating supply.
For this audit, we reviewed the AcceptCrypto contract provided to us by the project team.
Please ensure trust in the team prior to investing as they have some control in the ecosystem.
Date: March 7th, 2022.
- The total supply of the token is set to 1 trillion $ACEPT [1,000,000,000,000].
- No mint or burn functions are accessible beyond deployment, though the circulating supply can be decreased by sending tokens to the 0x..dead address.
- There was no token allocation for our team to analyze as the contract has yet to be deployed to the Mainnet.
- Trading must be enabled before all transfers can take place on the platform. Only accounts that have been excluded can participate in transfers when trading is disabled.
- Trading will be enabled when an account that is excluded sells tokens to the Pair address for the first time. Once trading is enabled it can never be disabled.
- The contract enforces a maximum transaction amount (determined by the owner) which imposes a limit to the number of tokens that can be transferred during any given transaction.
- The contract enforces a maximum wallet amount that prevents a transfer from occurring if the recipient's token balance will exceed the limit number of tokens (determined by the owner) after the transfer occurs.
- The maximum wallet amount is not enforced when the recipient is the Router or the Pair address.
- The contract features an Antisniper mechanism that is triggered when a user attempts to buy or sell tokens within 2 blocks of trading being enabled. The account initiating the transfer will be taxed at a ~90% rate.
- There is a Liquidity fee, Buyback fee, Marketing fee, and Dev fee on all transfers where neither the sender nor the recipient is excluded from fees. A separate fee structure can be set by the team to apply different fee percentages depending on whether the user is buying or selling during the transfer.
- The tokens collected from fees are stored in the contract address. The tokens are swapped for ETH for the purpose of funding Uniswap liquidity when the following conditions are met:
- The threshold number of tokens in the contract address (determined by the owner) has been reached.
- The contract is not currently performing an automatic liquidity add.
- The recipient is not the Pair address.
- Neither the sender nor the recipient is the owner.
- Liquidity-adds are automatically performed by selling the tokens collected as fees, pairing the received ETH with the token, and adding it as liquidity to the ETH pair.
- The LP tokens received through this process are sent to the 0x..dead address.
- The tokens collected from the Dev fee and Marketing fee are swapped for ETH and sent to the team's Dev wallet and Marketing wallet respectively.
- The tokens collected from the Buyback fee are swapped back to $ACEPT from ETH and are sent to the 0x..dead address.
- As the contract is implemented with Solidity v0.8.x, it is safe from any possible overflows/underflows.
- The contract complies with the ERC-20 token standard.
- The owner can modify the Liquidity fee, Buyback fee, Marketing fee, and Dev fee for both fee structures to any percentages as long as the total fee percentage combined does not exceed 10% for the buy fees and 12% for the sell fees.
- The owner can enable/disable buy fees and sell fees at any time.
- The owner can add/remove accounts from a blacklist which prevents them from being able to participate in transfers.
- The owner can update the maximum transaction amount to any value at any time.
- The owner can update the maximum wallet amount to any value at any time.
- The owner can exclude and include accounts from transfer fees, the maximum transaction amount, and the maximum wallet amount.
- The owner can update the threshold number of tokens needed to trigger an automatic liquidity add to any value at any time.
|Arbitrary Jump/Storage Write||N/A||PASS|
|Centralization of Control||The owner can blacklist accounts from being able to participate in transfers.||PASS|
|Delegate Call to Untrusted Contract||N/A||PASS|
|Dependence on Predictable Variables||N/A||PASS|
|Improper Authorization Scheme||N/A||PASS|
|Outdated Compiler Version||N/A||PASS|
|Overall Contract Safety||PASS|
($) = payable function # = non-constant function Int = Internal Ext = External Pub = Public + Context - [Int] _msgSender - [Int] _msgData + Ownable (Context) - [Pub]
# - [Pub] owner - [Pub] renounceOwnership # - modifiers: onlyOwner - [Pub] transferOwnership # - modifiers: onlyOwner - [Int] _transferOwnership # + [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] IUniswapV2Factory - [Ext] feeTo - [Ext] feeToSetter - [Ext] getPair - [Ext] allPairs - [Ext] allPairsLength - [Ext] createPair # - [Ext] setFeeTo # - [Ext] setFeeToSetter # + [Int] IUniswapV2Router01 - [Ext] factory - [Ext] WETH - [Ext] addLiquidity # - [Ext] addLiquidityETH ($) - [Ext] removeLiquidity # - [Ext] removeLiquidityETH # - [Ext] removeLiquidityWithPermit # - [Ext] removeLiquidityETHWithPermit # - [Ext] swapExactTokensForTokens # - [Ext] swapTokensForExactTokens # - [Ext] swapExactETHForTokens ($) - [Ext] swapTokensForExactETH # - [Ext] swapExactTokensForETH # - [Ext] swapETHForExactTokens ($) - [Ext] quote - [Ext] getAmountOut - [Ext] getAmountIn - [Ext] getAmountsOut - [Ext] getAmountsIn + [Int] IUniswapV2Router02 (IUniswapV2Router01) - [Ext] removeLiquidityETHSupportingFeeOnTransferTokens # - [Ext] removeLiquidityETHWithPermitSupportingFeeOnTransferTokens # - [Ext] swapExactTokensForTokensSupportingFeeOnTransferTokens # - [Ext] swapExactETHForTokensSupportingFeeOnTransferTokens ($) - [Ext] swapExactTokensForETHSupportingFeeOnTransferTokens # + [Int] IERC20 - [Ext] totalSupply - [Ext] balanceOf - [Ext] transfer # - [Ext] allowance - [Ext] approve # - [Ext] transferFrom # + [Int] IERC20Metadata (IERC20) - [Ext] name - [Ext] symbol - [Ext] decimals + ERC20 (Context, IERC20, IERC20Metadata) - [Pub] # - [Pub] name - [Pub] symbol - [Pub] decimals - [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] _spendAllowance # - [Int] _beforeTokenTransfer # - [Int] _afterTokenTransfer # + AcceptCrypto (ERC20, Ownable) - [Pub] # - modifiers: ERC20 - [Ext] ($) - [Int] _transfer # - [Prv] swapAndLiquify # - [Prv] swapTokensForEth # - [Prv] addLiquidity # - [Prv] swapAndSendDividends # - [Prv] buyBackAndBurn # - [Ext] setExcluded # - modifiers: onlyOwner - [Ext] setBlacklist # - modifiers: onlyOwner - [Ext] setSellFeeDisabled # - modifiers: onlyOwner - [Ext] setBuyFeeDisabled # - modifiers: onlyOwner - [Ext] setMaxWalletSize # - modifiers: onlyOwner - [Ext] setMaxTxAmount # - modifiers: onlyOwner - [Ext] setSwapAtAmount # - modifiers: onlyOwner - [Ext] setSellFees # - modifiers: onlyOwner - [Ext] setBuyFees # - modifiers: onlyOwner - [Pub] transferOwnership # - modifiers: onlyOwner
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What is a Solidity Audit?
Typically, a smart contract audit is a comprehensive review process designed to discover logical errors, security vulnerabilities, and optimization opportunities within code. A Solidity Audit takes this a step further by verifying economic logic to ensure the stability of smart contracts and highlighting privileged functionality to create a report that is easy to understand for developers and community members alike.
How Do I Interpret the Findings?
Each of our Findings will be labeled with a Severity level. We always recommend the team resolve High, Medium, and Low severity findings prior to deploying the code to the mainnet. Here is a breakdown on what each Severity level means for the project:
- High severity indicates that the issue puts a large number of users' funds at risk and has a high probability of exploitation, or the smart contract contains serious logical issues which can prevent the code from operating as intended.
- Medium severity issues are those which place at least some users' funds at risk and has a medium to high probability of exploitation.
- Low severity issues have a relatively minor risk association; these issues have a low probability of occurring or may have a minimal impact.
- Informational issues pose no immediate risk, but inform the project team of opportunities for gas optimizations and following smart contract security best practices.