KAT [KizunaAI] Token

Unable to find manual contract audit (e.g. Certik, PeckShield, Solidity...)

Reentrancy in KizunaAIToken.handleTax(address,address,uint256) (#606-710):
External calls:
- _transfer(from,address(this),tax) (#635)
- uniswapV2Router02.swapExactTokensForETH(toSell,0,sellPath,address(this),block.timestamp) (#656-662)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
- uniswapV2Router02.swapExactTokensForETH(toSell,0,sellPath,address(this),block.timestamp) (#656-662)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- _transfer(address(this),taxWallets[dev],remainingTokens) (#687)
- uniswapV2Router02.swapExactTokensForETH(toSell,0,sellPath,address(this),block.timestamp) (#656-662)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
External calls sending eth:
- _transfer(from,address(this),tax) (#635)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- _transfer(address(this),taxWallets[dev],remainingTokens) (#687)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
State variables written after the call(s):
- charityTokens = 0 (#701)
- devTokens = 0 (#699)
- liquidityTokens = 0 (#700)
- marketingTokens = 0 (#698)
Apply the check-effects-interactions pattern.

Additional information: link

KizunaAIToken.handleTax(address,address,uint256) (#606-710) uses a dangerous strict equality:
- taxSum == 0 (#645)
Don't use strict equality to determine if an account has enough Ether or tokens.

Additional information: link

KizunaAIToken.handleTax(address,address,uint256) (#606-710) performs a multiplication on the result of a division:
-charityETH = (ethGained * ((charityTokens * 10 ** 6) / taxSum)) / 10 ** 6 (#671)
Consider ordering multiplication before division.

Additional information: link

Context._msgData() (#107-109) is never used and should be removed
Remove unused functions.

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KizunaAIToken._transfer(address,address,uint256) (#712-727) uses tx.origin for authorization: require(bool,string)(! isBlacklisted(tx.origin),Kizuna AI Token: sender blacklisted) (#720)
Do not use tx.origin for authorization.

Additional information: link

KizunaAIToken.handleTax(address,address,uint256) (#606-710) ignores return value by taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
Ensure that the return value of a low-level call is checked or logged.

Additional information: link

KizunaAIToken.handleTax(address,address,uint256).tax (#612) is a local variable never initialized
Initialize all the variables. If a variable is meant to be initialized to zero, explicitly set it to zero to improve code readability.

Additional information: link

KizunaAIToken.handleTax(address,address,uint256) (#606-710) ignores return value by uniswapV2Router02.swapExactTokensForETH(toSell,0,sellPath,address(this),block.timestamp) (#656-662)
Ensure that all the return values of the function calls are used.

Additional information: link

Reentrancy in KizunaAIToken.handleTax(address,address,uint256) (#606-710):
External calls:
- _transfer(from,address(this),tax) (#635)
- uniswapV2Router02.swapExactTokensForETH(toSell,0,sellPath,address(this),block.timestamp) (#656-662)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
- uniswapV2Router02.swapExactTokensForETH(toSell,0,sellPath,address(this),block.timestamp) (#656-662)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- _transfer(address(this),taxWallets[dev],remainingTokens) (#687)
- uniswapV2Router02.swapExactTokensForETH(toSell,0,sellPath,address(this),block.timestamp) (#656-662)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
External calls sending eth:
- _transfer(from,address(this),tax) (#635)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- _transfer(address(this),taxWallets[dev],remainingTokens) (#687)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
State variables written after the call(s):
- _transfer(address(this),taxWallets[dev],remainingTokens) (#687)
- _allowances[owner][spender] = amount (#255)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in KizunaAIToken.handleTax(address,address,uint256) (#606-710):
External calls:
- _transfer(from,address(this),tax) (#635)
- uniswapV2Router02.swapExactTokensForETH(toSell,0,sellPath,address(this),block.timestamp) (#656-662)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
- uniswapV2Router02.swapExactTokensForETH(toSell,0,sellPath,address(this),block.timestamp) (#656-662)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- _transfer(address(this),taxWallets[dev],remainingTokens) (#687)
- uniswapV2Router02.swapExactTokensForETH(toSell,0,sellPath,address(this),block.timestamp) (#656-662)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
External calls sending eth:
- _transfer(from,address(this),tax) (#635)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- _transfer(address(this),taxWallets[dev],remainingTokens) (#687)
- (amountToken,amountETH,liquidity) = uniswapV2Router02.addLiquidityETH{value: liquidityETH}(address(this),liquidityToken,0,0,taxWallets[liquidity],block.timestamp) (#675-682)
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#256)
- _transfer(address(this),taxWallets[dev],remainingTokens) (#687)
- Transfer(sender,recipient,amount) (#213)
- _transfer(address(this),taxWallets[dev],remainingTokens) (#687)
Apply the check-effects-interactions pattern.

Additional information: link

KizunaAIToken.handleTax(address,address,uint256) (#606-710) uses timestamp for comparisons
Dangerous comparisons:
- tax > 0 (#620)
- tax > 0 (#634)
- taxSum == 0 (#645)
- ethValue >= swapThreshold (#649)
- remainingTokens > 0 (#686)
- ethGained - (marketingETH + devETH + liquidityETH + charityETH) > 0 (#694)
Avoid relying on block.timestamp.

Additional information: link

solc-0.8.9 is not recommended for deployment
Deploy with any of the following Solidity versions: 0.5.16 - 0.5.17, 0.6.11 - 0.6.12, 0.7.5 - 0.7.6 Use a simple pragma version that allows any of these versions. Consider using the latest version of Solidity for testing.

Additional information: link

Low level call in KizunaAIToken.handleTax(address,address,uint256) (#606-710):
- taxWallets[marketing].call{value: marketingETH}() (#690)
- taxWallets[dev].call{value: devETH}() (#691)
- taxWallets[charity].call{value: charityETH}() (#692)
- taxWallets[marketing].call{value: ethGained - (marketingETH + devETH + liquidityETH + charityETH)}() (#695)
Avoid low-level calls. Check the call success. If the call is meant for a contract, check for code existence

Additional information: link

Function IUniswapV2Router01.WETH() (#412) is not in mixedCase
Follow the Solidity naming convention.

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Variable IUniswapV2Router01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#417) is too similar to IUniswapV2Router01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#418)
Prevent variables from having similar names.

Additional information: link

KizunaAIToken.slitherConstructorVariables() (#545-811) uses literals with too many digits:
- swapThreshold = 500000000000 (#552)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

KizunaAIToken.swapThreshold (#552) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

disableTax() should be declared external:
- KizunaAIToken.disableTax() (#794-797)
Use the external attribute for functions never called from the contract.

Additional information: link

Number of Binance Smart Chain (BSC) token holders is less than 100. Token is either dead or inactive. Ignore for presale.

Average PancakeSwap trading volume, liqudity, number of swaps are extremely low. Token seems to be dead.

Token is deployed only at one blockchain

Token has only one trading pair

Unable to find PancakeSwap trading pair to compute liquidity.

Unable to find PancakeSwap trading pair to compute volume.

Unable to find PancakeSwap trading pair to compute number of swaps.

Unable to find website, listings and other project-related information

Young tokens have high risks of price dump / death

Token has no active CoinGecko listing / rank

Token has no active CoinMarketCap listing / rank