MemeKing - Smart Contract Audit Report

Summary

MemeKing Audit Report MemeKing ($MMK) is a new community-driven DeFi token that is an automatic liquidity providing protocol that pays out static rewards to holders.

For this audit we reviewed the projects smart contract using code that was provided to us by the team.


Notes on the Contract:
  • The total supply of the token is set to 100 million $MMK [100,000,000].
  • No minting or burn functions are present; though the circulating supply can be reduced by sending tokens to the 0x..dead address, if desired.
  • There was no token allocation for our team to analyze as the contract has not yet been deployed to the mainnet.

  • There is a tax fee, liquidity fee, reward fee, marketing fee, dev fee, and burn fee charged on all transactions for any "non-excluded" address that participates in a transfer with Uniswap. A separate fee structure can be set by the team to apply different fee amounts depending on whether the user is buying or selling during the transfer.
  • Another separate whale fee structure can be set by the team which will be triggered when the amount of tokens being sold or bought from Uniswap exceeds the specific number of tokens determined by the owner.
  • Users who hold tokens will automatically benefit from the frictionless fee redistribution at the time of each transaction as the tokens collected through the tax fee are removed from the circulating supply.
  • The tokens collected from the liquidity fee during transfers are stored in the contract address balance. Once the threshold value (determined by the owner) is met, a swap will occur for the purpose of funding Pancakeswap liquidity.
  • Liquidity-adds are funded by selling a portion of the tokens collected as fees (after the threshold as determined by the owner is met), then pairing the received BNB with the token, and adding it as liquidity to the BNB pair.
  • The recipient of the newly created LP tokens is the owner. The stability of the liquidity pool can be at risk if these LP tokens are not locked.
  • The tokens collected from the burn fee are sent to the Burn address.
  • The tokens collected from the marketing fee are sent to the team's marketing address.
  • The tokens collected from the reward fee are sent to the team's reward address.
  • The tokens collected from the dev fee are sent to the team's dev address.
  • As the contract is implemented with Solidity v0.8.x it is protected from overflows.

  • Ownership Controls:
  • The owner can modify all six fees for each fee structure to any percentages at any time.
  • The owner can exclude and include accounts from transfer fees and reward distribution.
  • The owner can update the amount of tokens needed to trigger the whale fee structure to any amount at any time.
  • The owner has the ability to enable/disable automatic liquidity adds at any time.
  • The owner can update the threshold value of tokens needed to perform automatic liquidity adds.
  • The owner can update all of the wallets that are controlled by the team to any addresses at any time.
  • The owner can update the UniswapV2Router and Automated Market Maker Pair contract addresses at any time.
Audit Findings Summary
  • No external threats were identified.
  • Please ensure trust in the team prior to investing as they have substantial control in the ecosystem.
  • Date: November 4th, 2021

Audit Results

Vulnerability CategoryNotesResult
Arbitrary Storage WriteN/APASS
Arbitrary JumpN/APASS
Delegate Call to Untrusted ContractN/APASS
Dependence on Predictable VariablesN/APASS
Deprecated OpcodesN/APASS
Ether ThiefN/APASS
ExceptionsN/APASS
External CallsN/APASS
Flash LoansN/APASS
Integer Over/UnderflowN/APASS
Multiple SendsN/APASS
OraclesN/APASS
SuicideN/APASS
State Change External CallsN/APASS
Unchecked RetvalN/APASS
User Supplied AssertionN/APASS
Critical Solidity CompilerN/APASS
Overall Contract Safety PASS

Function Graph

ERC20 Token Graph


Inheritence Chart

Multi-file Token


Functions Overview


 ($) = payable function
 # = non-constant function
 
 + [Int] IERC20 
    - [Ext] totalSupply
    - [Ext] balanceOf
    - [Ext] transfer #
    - [Ext] allowance
    - [Ext] approve #
    - [Ext] transferFrom #

 + [Lib] SafeMath 
    - [Int] tryAdd
    - [Int] trySub
    - [Int] tryMul
    - [Int] tryDiv
    - [Int] tryMod
    - [Int] add
    - [Int] sub
    - [Int] mul
    - [Int] div
    - [Int] mod
    - [Int] sub
    - [Int] div
    - [Int] mod

 +  Context 
    - [Int] _msgSender
    - [Int] _msgData

 + [Lib] Address 
    - [Int] isContract
    - [Int] sendValue #
    - [Int] functionCall #
    - [Int] functionCall #
    - [Int] functionCallWithValue #
    - [Int] functionCallWithValue #
    - [Int] functionStaticCall
    - [Int] functionStaticCall
    - [Int] functionDelegateCall #
    - [Int] functionDelegateCall #
    - [Prv] _verifyCallResult

 +  Ownable (Context)
    - [Pub]  #
    - [Pub] owner
    - [Pub] renounceOwnership #
       - modifiers: onlyOwner
    - [Pub] transferOwnership #
       - modifiers: onlyOwner
	   

 + [Int] IUniswapV2Factory 
    - [Ext] feeTo
    - [Ext] feeToSetter
    - [Ext] getPair
    - [Ext] allPairs
    - [Ext] allPairsLength
    - [Ext] createPair #
    - [Ext] setFeeTo #
    - [Ext] setFeeToSetter #

 + [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] 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 #

 +  MemeKing (Context, IERC20, Ownable)
    - [Pub]  #
    - [Pub] name
    - [Pub] symbol
    - [Pub] decimals
    - [Pub] totalSupply
    - [Pub] balanceOf
    - [Pub] transfer #
    - [Pub] allowance
    - [Pub] approve #
    - [Pub] transferFrom #
    - [Pub] increaseAllowance #
    - [Pub] decreaseAllowance #
    - [Pub] isExcludedFromReward
    - [Pub] totalFees
    - [Pub] deliver #
    - [Pub] reflectionFromToken
    - [Pub] tokenFromReflection
    - [Pub] changeRewardStatus #
       - modifiers: onlyOwner
    - [Pub] changeFeeStatus #
       - modifiers: onlyOwner
    - [Pub] setSwapAndLiquifyEnabled #
       - modifiers: onlyOwner
    - [Ext]  ($)
    - [Prv] _reflectFee #
    - [Prv] _getValues
    - [Prv] _getTValues
    - [Prv] _getRValues
    - [Prv] _getRate
    - [Prv] _getCurrentSupply
    - [Prv] _takeLiquidity #
    - [Prv] _takeDev #
    - [Prv] _takeReward #
    - [Prv] _takeMarketing #
    - [Prv] _takeBurn #
    - [Prv] calculateTaxFee
    - [Prv] calculateDevFee
    - [Prv] calculateLiquidityFee
    - [Prv] calculateBurnFee
    - [Prv] calculateRewardFee
    - [Prv] calculateMarketingFee
    - [Pub] setWhalePercent #
       - modifiers: onlyOwner
    - [Prv] removeAllFee #
    - [Prv] restoreAllFee #
    - [Pub] isExcludedFromFee
    - [Prv] _approve #
    - [Prv] _transfer #
    - [Prv] swapAndLiquify #
       - modifiers: lockTheSwap
    - [Prv] swapTokensForEth #
    - [Prv] addLiquidity #
    - [Prv] _tokenTransfer #
    - [Prv] _transferStandard #
    - [Prv] _transferFromExcluded #
    - [Prv] _transferToExcluded #
    - [Prv] _transferBothExcluded #
    - [Ext] setRouterAddress #
       - modifiers: onlyOwner
    - [Ext] setNumTokensSellToAddToLiquidity #
       - modifiers: onlyOwner
    - [Ext] setAutomatedMarketMakerPair #
       - modifiers: onlyOwner
    - [Prv] _setAutomatedMarketMakerPair #
    - [Pub] setFeeAddresses #
       - modifiers: onlyOwner
    - [Pub] setSellFees #
       - modifiers: onlyOwner
    - [Pub] setBuyFees #
       - modifiers: onlyOwner
    - [Pub] setWhaleBuyFee #
       - modifiers: onlyOwner
    - [Pub] setWhaleSellFee #
       - modifiers: onlyOwner