21 Equity - Smart Contract Audit Report

Summary

21 Equity ($XXI) is a new token with liquidity adds and a buyback system for burning supply that pays users dividends in BUSD.

Overview of the Contract:

• The total supply of the token is set to 2.917 trillion; the total supply is initially minted to the presaler address which is controlled by the owner.
• No mint or burn functions are present; though the circulating supply can be reduced by sending tokens to the 0x..dead address or the 0x..0000 address, if desired.


• There is a maximum transaction amount of 291.7 billion tokens during sell transactions to PancakeSwap; this does not apply to addresses exempt from the maximum transaction amount.
• Trading is initially disabled for every address and will be enabled the first time anyone performs a sell transaction to PancakeSwap.
• There is a tax fee up to 25% charged on each transaction that is stored in the contract balance; fees can be increased up to 99% during the first 2 blocks since launch, and fees can be increased during a sell to PancakeSwap up to a value proportional to the time left in the buyback multiplier period if any.
• Once a threshold value of tokens in the contract balance is met, a portion of the contract balance is swapped for BNB and distributed as dividends, and another portion is sent to the marketing wallet which is controlled by the project team.
• Another portion is allocated to funding PancakeSwap liquidity, unless the liquidity cap set by the team has already been met.
• Liquidity-adds are funded by selling half of the tokens allocated to funding liquidity, pairing the received BNB with the token, and adding it as liquidity to the BNB pair.
• The newly created LP tokens are sent to an address controlled by the team. We recommend liquidity is locked at the time of acquisition.
• Any remaining BNB in the contract may be swapped for XXI tokens and sent to the burn address, if the auto buyback functionality is enabled.
• A user must hold an amount of XXI tokens determined by the team to be eligible for dividends.


• Once dividends are distributed, they will need to be claimed; claiming happens automatically on each transfer.
• Dividend rewards can also be claimed manually by kicking off the claim cycle, which will process all eligible token holders.
• Alternatively, a user can manually claim dividends as an individual.
• There is a wait-time between claiming dividend rewards.
• Claimed dividends are sent to the user's wallet address.


• The owner is able to set the total fees charged on transactions to any value up to 25% at any time.
• The owner is able to set the percentage of the fees allocated to any fund (liquidity, marketing, buyback, dividends) at any time.
• The owner is able to automatically trigger a buyback at any time.
• The owner is able to set or disable the buyback fee multiplier at any time.
• The owner is able to disable the autobuyback system and set any threshold value related to it.
• The owner is able to disable the automatic liquidity adds at any time and set any threshold value related to it.
• The owner is able to exclude any address from dividends at any time.
• The owner is able to update the Dividend Distributor and PancakeSwap Router contract addresses at any time.
• The owner is able to update the maximum amount of gas used for processing to a value up to 750,000 at any time.
• The owner is able to update the amount of time a user must wait between claiming dividends to any value at any time.
• The owner is able to toggle the swap and liquify functionality at any time.


• The contract utilizes the SafeMath library to prevent overflows along with following the BEP20 standard.

Audit Findings Summary

• Buyback functionality may be suseptible to front-running; The team must monitor and if suspicious activity is detected, the team must disable the buyback system.
• Ensure trust in the team as they have substantial control in the ecosystem.
• Date: August 21st, 2021

												
($) = payable function
 # = non-constant function

 + [Lib] SafeMath 
    - [Int] add
    - [Int] sub
    - [Int] sub
    - [Int] mul
    - [Int] div
    - [Int] div

 + [Int] IBEP20 
    - [Ext] totalSupply
    - [Ext] decimals
    - [Ext] symbol
    - [Ext] name
    - [Ext] getOwner
    - [Ext] balanceOf
    - [Ext] transfer #
    - [Ext] allowance
    - [Ext] approve #
    - [Ext] transferFrom #

 +  Auth 
    - [Pub]  #
    - [Pub] authorize #
       - modifiers: onlyOwner
    - [Pub] unauthorize #
       - modifiers: onlyOwner
    - [Pub] isOwner
    - [Pub] isAuthorized
    - [Pub] transferOwnership #
       - modifiers: onlyOwner

 + [Int] IDEXFactory 
    - [Ext] createPair #

 + [Int] IDEXRouter 
    - [Ext] factory
    - [Ext] WETH
    - [Ext] addLiquidity #
    - [Ext] addLiquidityETH ($)
    - [Ext] swapExactTokensForTokensSupportingFeeOnTransferTokens #
    - [Ext] swapExactETHForTokensSupportingFeeOnTransferTokens ($)
    - [Ext] swapExactTokensForETHSupportingFeeOnTransferTokens #

 + [Int] IDividendDistributor 
    - [Ext] setDistributionCriteria #
    - [Ext] setShare #
    - [Ext] deposit ($)
    - [Ext] process #

 +  DividendDistributor (IDividendDistributor)
    - [Pub]  #
    - [Ext] setDistributionCriteria #
       - modifiers: onlyToken
    - [Ext] setShare #
       - modifiers: onlyToken
    - [Ext] deposit ($)
       - modifiers: onlyToken
    - [Ext] process #
       - modifiers: onlyToken
    - [Int] shouldDistribute
    - [Int] distributeDividend #
    - [Ext] claimDividend #
    - [Pub] getUnpaidEarnings
    - [Int] getCumulativeDividends
    - [Int] addShareholder #
    - [Int] removeShareholder #

 +  XXIEQUITY (IBEP20, Auth)
    - [Pub]  #
       - modifiers: Auth
    - [Ext]  ($)
    - [Ext] totalSupply
    - [Ext] decimals
    - [Ext] symbol
    - [Ext] name
    - [Ext] getOwner
    - [Pub] balanceOf
    - [Ext] allowance
    - [Pub] approve #
    - [Ext] approveMax #
    - [Ext] transfer #
    - [Ext] transferFrom #
    - [Int] _transferFrom #
    - [Int] _basicTransfer #
    - [Int] checkTxLimit
    - [Int] shouldTakeFee
    - [Pub] getTotalFee
    - [Pub] getMultipliedFee
    - [Int] takeFee #
    - [Int] shouldSwapBack
    - [Int] swapBack #
       - modifiers: swapping
    - [Int] shouldAutoBuyback
    - [Ext] triggerBuyback #
       - modifiers: authorized
    - [Ext] clearBuybackMultiplier #
       - modifiers: authorized
    - [Int] triggerAutoBuyback #
    - [Int] buyTokens #
       - modifiers: swapping
    - [Ext] setAutoBuybackSettings #
       - modifiers: authorized
    - [Ext] setBuybackMultiplierSettings #
       - modifiers: authorized
    - [Int] launched
    - [Int] launch #
    - [Ext] setTxLimit #
       - modifiers: authorized
    - [Ext] setIsDividendExempt #
       - modifiers: authorized
    - [Ext] setIsFeeExempt #
       - modifiers: authorized
    - [Ext] setIsTxLimitExempt #
       - modifiers: authorized
    - [Ext] setFees #
       - modifiers: authorized
    - [Ext] setFeeReceivers #
       - modifiers: authorized
    - [Ext] setSwapBackSettings #
       - modifiers: authorized
    - [Ext] setTargetLiquidity #
       - modifiers: authorized
    - [Ext] setDistributionCriteria #
       - modifiers: authorized
    - [Ext] setDistributorSettings #
       - modifiers: authorized
    - [Pub] getCirculatingSupply
    - [Pub] getLiquidityBacking
    - [Pub] isOverLiquified

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