Smart Contract Audit Report

Audit Summary

MetaMate Audit Report MetaMate is building a new BEP-20 token with a Liquidity Generation Event.

For this audit, we reviewed the project team's MTMToken contract at 0x3244478Da3F518B33b99D5929Dd0bC3396C56981 on the Binance Smart Chain Mainnet.

Audit Findings

Please ensure trust in the team prior to investing as they have some control in the ecosystem and currently own 100% of the total supply.
Date: March 21st, 2022.

Finding #1 - MTMToken - Informational

Description: The setFee function is declared public, but is never called internally.
Recommendation: This function should be declared external for additional gas savings on each call.

Contract Overview

  • The total supply of the token is set to 1 billion $MTM [1,000,000,000].
  • No mint or burn functions are present though the circulating supply can be decreased by sending tokens to the 0x..dead address.
  • At the time of writing this report, 100% of the total supply belongs to the owner.

  • The contract supports a Liquidity Generation Event consisting of one or many rounds as determined by the owner.
  • Each round has a set duration, a maximum contribution amount per user, and a whitelist of addresses that are able to participate; these values are determined by the LGE Whitelister address, which is set by the owner.
  • After the rounds are created and the Pair address is set, anyone may kick off the Liquidity Generation Event by transferring tokens to the Pair address.
  • Only whitelisted users may participate in the Liquidity Generation Event by purchasing tokens from the Pair; there may be a different set of whitelisted users for every round.
  • During the Liquidity Generation Event, the amount of purchased tokens is recorded to ensure it does not exceed the maximum allowed amount per user per round.
  • The LGE Whitelister address can set the Pair address, delete the round data, modify the round duration, maximum contribution amount, and list of whitelisted users for any round at any time.
  • The LGE Whitelister address can transfer their role to any address at any time; initially, the owner is set as the LGE Whitelister.

  • The contract enforces a maximum transaction amount (determined by the owner) when selling tokens via Pancakeswap.
  • There is a transfer fee charged on all buy and sell trades with Pancakeswap where neither the sender nor the recipient is the contract address.
  • The tokens collected through the transfer fee are swapped for BNB and sent to the team's Marketing wallet.
  • The owner can set both the buy fee and sell fee to any values up to 10%.
  • The owner can set the team's Marketing wallet to any address at any time.
  • The owner can set the maximum transaction amount to any value greater than 200,000.
  • The owner can include/exclude accounts from the maximum transaction amount limit at any time.
  • The contract utilizes the SafeMath library to prevent overflows/underflows.
  • The contract complies with the BEP-20 token standard.

Audit Results

Vulnerability CategoryNotesResult
Arbitrary Jump/Storage WriteN/APASS
Centralization of ControlThe owner currently owns 100% of the total supply.PASS
Compiler IssuesN/APASS
Delegate Call to Untrusted ContractN/APASS
Dependence on Predictable VariablesN/APASS
Ether/Token TheftN/APASS
Flash LoansN/APASS
Front RunningN/APASS
Improper EventsN/APASS
Improper Authorization SchemeN/APASS
Integer Over/UnderflowN/APASS
Logical IssuesN/APASS
Oracle IssuesN/APASS
Outdated Compiler VersionN/APASS
Race ConditionsN/APASS
Signature IssuesN/APASS
Unbounded LoopsN/APASS
Unused CodeN/APASS
Overall Contract Safety PASS

Inheritance Chart

Smart Contract Audit - Inheritance

Function Graph

Smart Contract Audit - Graph

Functions Overview

 ($) = payable function
 # = non-constant function
 Int = Internal
 Ext = External
 Pub = Public

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

 + [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

 +  ERC20 (Context, IERC20)
    - [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] _setupDecimals #
    - [Int] _beforeTokenTransfer #

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

 + [Int] IPancakePair 
    - [Ext] name
    - [Ext] symbol
    - [Ext] decimals
    - [Ext] totalSupply
    - [Ext] balanceOf
    - [Ext] allowance
    - [Ext] approve #
    - [Ext] transfer #
    - [Ext] transferFrom #
    - [Ext] nonces
    - [Ext] permit #
    - [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] IPancakeFactory 
    - [Ext] feeTo
    - [Ext] feeToSetter
    - [Ext] getPair
    - [Ext] allPairs
    - [Ext] allPairsLength
    - [Ext] createPair #
    - [Ext] setFeeTo #
    - [Ext] setFeeToSetter #

 + [Int] IPancakeRouter01 
    - [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] IPancakeRouter02 (IPancakeRouter01)
    - [Ext] removeLiquidityETHSupportingFeeOnTransferTokens #
    - [Ext] removeLiquidityETHWithPermitSupportingFeeOnTransferTokens #
    - [Ext] swapExactTokensForTokensSupportingFeeOnTransferTokens #
    - [Ext] swapExactETHForTokensSupportingFeeOnTransferTokens ($)
    - [Ext] swapExactTokensForETHSupportingFeeOnTransferTokens #

 +  LGEWhitelisted (Context)
    - [Int]  #
    - [Ext] renounceWhitelister #
       - modifiers: onlyWhitelister
    - [Ext] transferWhitelister #
       - modifiers: onlyWhitelister
    - [Int] _transferWhitelister #
    - [Ext] createLGEWhitelist #
       - modifiers: onlyWhitelister
    - [Ext] modifyLGEWhitelist #
       - modifiers: onlyWhitelister
    - [Pub] getLGEWhitelistRound
    - [Int] _applyLGEWhitelist #

 +  MTMToken (Context, ERC20, Ownable, LGEWhitelisted)
    - [Pub]  #
       - modifiers: ERC20
    - [Ext]  ($)
    - [Pub] setFee #
       - modifiers: onlyOwner
    - [Ext] setMktAddress #
       - modifiers: onlyOwner
    - [Pub] setWhitelistAddr #
       - modifiers: onlyOwner
    - [Pub] isWhitelistAddr
    - [Int] _transfer #
    - [Ext] setMaxAmount #
       - modifiers: onlyOwner
    - [Prv] swapTokensForEth #

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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.