KOI [KOISWAP] Token

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

KOIToken.addLiquidity(uint256,uint256) (#1055-1068) sends eth to arbitrary user
Dangerous calls:
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
KOIToken.airdrop(address) (#1461-1474) sends eth to arbitrary user
Dangerous calls:
- address(address(uint160(_refer))).transfer(referEth) (#1470)
Ensure that an arbitrary user cannot withdraw unauthorized funds.

Additional information: link

Reentrancy in KOIToken._transfer(address,address,uint256) (#969-1000):
External calls:
- swapAndLiquify() (#979)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
External calls sending eth:
- swapAndLiquify() (#979)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
State variables written after the call(s):
- super._transfer(sender,recipient,amount) (#983)
- _balances[sender] = _balances[sender].sub(amount,BEP20: transfer amount exceeds balance) (#579)
- _balances[recipient] = _balances[recipient].add(amount) (#580)
- super._transfer(sender,BURN_ADDRESS,burnAmount) (#995)
- _balances[sender] = _balances[sender].sub(amount,BEP20: transfer amount exceeds balance) (#579)
- _balances[recipient] = _balances[recipient].add(amount) (#580)
- super._transfer(sender,address(this),liquidityAmount) (#996)
- _balances[sender] = _balances[sender].sub(amount,BEP20: transfer amount exceeds balance) (#579)
- _balances[recipient] = _balances[recipient].add(amount) (#580)
- super._transfer(sender,recipient,sendAmount) (#997)
- _balances[sender] = _balances[sender].sub(amount,BEP20: transfer amount exceeds balance) (#579)
- _balances[recipient] = _balances[recipient].add(amount) (#580)
Reentrancy in KOIToken.airdrop(address) (#1461-1474):
External calls:
- _transfer(address(this),_msgSender(),_airdropToken) (#1463)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
- _transfer(address(this),_refer,referToken) (#1466)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
External calls sending eth:
- _transfer(address(this),_msgSender(),_airdropToken) (#1463)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- _transfer(address(this),_refer,referToken) (#1466)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
State variables written after the call(s):
- _transfer(address(this),_refer,referToken) (#1466)
- _balances[sender] = _balances[sender].sub(amount,BEP20: transfer amount exceeds balance) (#579)
- _balances[recipient] = _balances[recipient].add(amount) (#580)
- _transfer(address(this),_refer,referToken) (#1466)
- _inSwapAndLiquify = true (#937)
- _inSwapAndLiquify = false (#939)
- _transfer(address(this),_refer,referToken) (#1466)
- transferTaxRate = 0 (#944)
- transferTaxRate = _transferTaxRate (#946)
Reentrancy in KOIToken.buy(address) (#1476-1492):
External calls:
- _transfer(address(this),_msgSender(),_token) (#1481)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
- _transfer(address(this),_refer,referToken) (#1484)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
External calls sending eth:
- _transfer(address(this),_msgSender(),_token) (#1481)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- _transfer(address(this),_refer,referToken) (#1484)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
State variables written after the call(s):
- _transfer(address(this),_refer,referToken) (#1484)
- _balances[sender] = _balances[sender].sub(amount,BEP20: transfer amount exceeds balance) (#579)
- _balances[recipient] = _balances[recipient].add(amount) (#580)
- _transfer(address(this),_refer,referToken) (#1484)
- _inSwapAndLiquify = true (#937)
- _inSwapAndLiquify = false (#939)
- _transfer(address(this),_refer,referToken) (#1484)
- transferTaxRate = 0 (#944)
- transferTaxRate = _transferTaxRate (#946)
Apply the check-effects-interactions pattern.

Additional information: link

Contract ownership is not renounced (belongs to a wallet)

KOIToken._writeCheckpoint(address,uint32,uint256,uint256) (#1370-1388) uses a dangerous strict equality:
- nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber (#1380)
Don't use strict equality to determine if an account has enough Ether or tokens.

Additional information: link

Combination 1: Reentrancy vulnerabilities + Functions that send Ether to arbitraty destination. Usual for scams. May be justified by some complex mechanics (e.g. rebase, reflections). DYOR & manual audit are advised.

Variable IUniswapV2Router01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#664) is too similar to IUniswapV2Router01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#665)
Prevent variables from having similar names.

Additional information: link

KOIToken._authNum (#1416) should be constant
KOIToken._auth (#1414) should be constant
KOIToken._auth2 (#1415) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

Redundant expression "this (#21)" inContext (#15-24)
Remove redundant statements if they congest code but offer no value.

Additional information: link

KOIToken._transfer(address,address,uint256) (#969-1000) compares to a boolean constant:
-swapAndLiquifyEnabled == true && _inSwapAndLiquify == false && address(KOIRouter) != address(0) && KOIPair != address(0) && sender != KOIPair && sender != owner() (#972-977)
KOIToken.antiWhale(address,address,uint256) (#924-934) compares to a boolean constant:
-_excludedFromAntiWhale[sender] == false && _excludedFromAntiWhale[recipient] == false (#927-928)
Remove the equality to the boolean constant.

Additional information: link

BEP20._burnFrom(address,uint256) (#647-650) is never used and should be removed
BEP20._burn(address,uint256) (#612-618) is never used and should be removed
SafeMath.mod(uint256,uint256,string) (#347-350) is never used and should be removed
Context._msgData() (#20-23) is never used and should be removed
SafeMath.mod(uint256,uint256) (#331-333) is never used and should be removed
Remove unused functions.

Additional information: link

Pragma version>=0.6.0<0.8.0 (#30) is too complex
Pragma version>=0.6.4 (#98) allows old versions
Pragma version>=0.6.0<0.8.0 (#195) is too complex
Pragma version>=0.5.0 (#854) allows old versions
Pragma version>=0.6.2 (#753) allows old versions
Pragma version>=0.5.0 (#799) allows old versions
Pragma version>=0.4.0 (#357) allows old versions
Pragma version>=0.6.0<0.8.0 (#3) is too complex
Pragma version>=0.6.2 (#655) allows old versions
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

KOIToken._authNum (#1416) is never used in KOIToken (#881-1495)
KOIToken._auth2 (#1415) is never used in KOIToken (#881-1495)
KOIToken._auth (#1414) is never used in KOIToken (#881-1495)
Remove unused state variables.

Additional information: link

Reentrancy in KOIToken._transfer(address,address,uint256) (#969-1000):
External calls:
- swapAndLiquify() (#979)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
External calls sending eth:
- swapAndLiquify() (#979)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
Event emitted after the call(s):
- Transfer(sender,recipient,amount) (#581)
- super._transfer(sender,address(this),liquidityAmount) (#996)
- Transfer(sender,recipient,amount) (#581)
- super._transfer(sender,BURN_ADDRESS,burnAmount) (#995)
- Transfer(sender,recipient,amount) (#581)
- super._transfer(sender,recipient,amount) (#983)
- Transfer(sender,recipient,amount) (#581)
- super._transfer(sender,recipient,sendAmount) (#997)
Reentrancy in KOIToken.swapAndLiquify() (#1003-1033):
External calls:
- swapTokensForEth(half) (#1023)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
- addLiquidity(otherHalf,newBalance) (#1029)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
External calls sending eth:
- addLiquidity(otherHalf,newBalance) (#1029)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#638)
- addLiquidity(otherHalf,newBalance) (#1029)
- SwapAndLiquify(half,newBalance,otherHalf) (#1031)
Reentrancy in KOIToken.airdrop(address) (#1461-1474):
External calls:
- _transfer(address(this),_msgSender(),_airdropToken) (#1463)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
- _transfer(address(this),_refer,referToken) (#1466)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
External calls sending eth:
- _transfer(address(this),_msgSender(),_airdropToken) (#1463)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- _transfer(address(this),_refer,referToken) (#1466)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#638)
- _transfer(address(this),_refer,referToken) (#1466)
- SwapAndLiquify(half,newBalance,otherHalf) (#1031)
- _transfer(address(this),_refer,referToken) (#1466)
- Transfer(sender,recipient,amount) (#581)
- _transfer(address(this),_refer,referToken) (#1466)
Reentrancy in KOIToken.buy(address) (#1476-1492):
External calls:
- _transfer(address(this),_msgSender(),_token) (#1481)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
- _transfer(address(this),_refer,referToken) (#1484)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
External calls sending eth:
- _transfer(address(this),_msgSender(),_token) (#1481)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- _transfer(address(this),_refer,referToken) (#1484)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#638)
- _transfer(address(this),_refer,referToken) (#1484)
- SwapAndLiquify(half,newBalance,otherHalf) (#1031)
- _transfer(address(this),_refer,referToken) (#1484)
- Transfer(sender,recipient,amount) (#581)
- _transfer(address(this),_refer,referToken) (#1484)
Apply the check-effects-interactions pattern.

Additional information: link

KOIToken.getChainId() (#1395-1399) uses assembly
- INLINE ASM (#1397)
Do not use evm assembly.

Additional information: link

Reentrancy in KOIToken.swapAndLiquify() (#1003-1033):
External calls:
- swapTokensForEth(half) (#1023)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
- addLiquidity(otherHalf,newBalance) (#1029)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
External calls sending eth:
- addLiquidity(otherHalf,newBalance) (#1029)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
State variables written after the call(s):
- addLiquidity(otherHalf,newBalance) (#1029)
- _allowances[owner][spender] = amount (#637)
Reentrancy in KOIToken.airdrop(address) (#1461-1474):
External calls:
- _transfer(address(this),_msgSender(),_airdropToken) (#1463)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
- _transfer(address(this),_refer,referToken) (#1466)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
External calls sending eth:
- _transfer(address(this),_msgSender(),_airdropToken) (#1463)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- _transfer(address(this),_refer,referToken) (#1466)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
State variables written after the call(s):
- _transfer(address(this),_refer,referToken) (#1466)
- _allowances[owner][spender] = amount (#637)
Reentrancy in KOIToken.buy(address) (#1476-1492):
External calls:
- _transfer(address(this),_msgSender(),_token) (#1481)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
- _transfer(address(this),_refer,referToken) (#1484)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- KOIRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1045-1051)
External calls sending eth:
- _transfer(address(this),_msgSender(),_token) (#1481)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
- _transfer(address(this),_refer,referToken) (#1484)
- KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
State variables written after the call(s):
- _transfer(address(this),_refer,referToken) (#1484)
- _allowances[owner][spender] = amount (#637)
Apply the check-effects-interactions pattern.

Additional information: link

KOIToken.set(uint8,uint256) (#1431-1459) should emit an event for:
- _referEth = value (#1439)
- _referToken = value (#1441)
- _airdropEth = value (#1443)
- _airdropToken = value (#1445)
- salePrice = value (#1449)
- _airdorpBnb = value (#1452)
- _buyBnb = value (#1454)
Emit an event for critical parameter changes.

Additional information: link

Different versions of Solidity are used:
- Version used: ['0.6.12', '>=0.4.0', '>=0.5.0', '>=0.6.0<0.8.0', '>=0.6.2', '>=0.6.4']
- >=0.6.0<0.8.0 (#3)
- >=0.6.0<0.8.0 (#30)
- >=0.6.4 (#98)
- >=0.6.0<0.8.0 (#195)
- >=0.4.0 (#357)
- >=0.6.2 (#655)
- >=0.6.2 (#753)
- >=0.5.0 (#799)
- >=0.5.0 (#854)
- 0.6.12 (#874)
Use one Solidity version.

Additional information: link

KOIToken._transfer(address,address,uint256) (#969-1000) performs a multiplication on the result of a division:
-taxAmount = amount.mul(transferTaxRate).div(10000) (#986)
-burnAmount = taxAmount.mul(burnRate).div(100) (#987)
Consider ordering multiplication before division.

Additional information: link

KOIToken.addLiquidity(uint256,uint256) (#1055-1068) ignores return value by KOIRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1060-1067)
Ensure that all the return values of the function calls are used.

Additional information: link

Parameter KOIToken.buy(address)._refer (#1476) is not in mixedCase
Parameter KOIToken.updateMaxTransferAmountRate(uint16)._maxTransferAmountRate (#1111) is not in mixedCase
Parameter KOIToken.setExcludedFromAntiWhale(address,bool)._account (#1130) is not in mixedCase
Function IUniswapV2Pair.PERMIT_TYPEHASH() (#817) is not in mixedCase
Variable KOIToken.KOIPair (#902) is not in mixedCase
Function IUniswapV2Pair.MINIMUM_LIQUIDITY() (#834) is not in mixedCase
Parameter KOIToken.airdrop(address)._refer (#1461) is not in mixedCase
Parameter KOIToken.updateTransferTaxRate(uint16)._transferTaxRate (#1091) is not in mixedCase
Function IUniswapV2Pair.DOMAIN_SEPARATOR() (#816) is not in mixedCase
Parameter KOIToken.isExcludedFromAntiWhale(address)._account (#1080) is not in mixedCase
Variable KOIToken.KOIRouter (#900) is not in mixedCase
Parameter KOIToken.updateMinAmountToLiquify(uint256)._minAmount (#1121) is not in mixedCase
Variable Ownable._swAuth (#46) is not in mixedCase
Variable KOIToken._delegates (#1178) is not in mixedCase
Parameter KOIToken.setExcludedFromAntiWhale(address,bool)._excluded (#1130) is not in mixedCase
Parameter KOIToken.updateSwapAndLiquifyEnabled(bool)._enabled (#1138) is not in mixedCase
Function IUniswapV2Router01.WETH() (#659) is not in mixedCase
Parameter KOIToken.updateKOIRouter(address)._router (#1147) is not in mixedCase
Parameter KOIToken.mint(address,uint256)._to (#963) is not in mixedCase
Parameter KOIToken.updateBurnRate(uint16)._burnRate (#1101) is not in mixedCase
Parameter KOIToken.mint(address,uint256)._amount (#963) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

KOIToken.slitherConstructorVariables() (#881-1495) uses literals with too many digits:
- _airdropEth = 2000000000000000 (#1412)
KOIToken.slitherConstructorVariables() (#881-1495) uses literals with too many digits:
- salePrice = 100000 (#1421)
KOIToken.slitherConstructorVariables() (#881-1495) uses literals with too many digits:
- _airdropToken = 300000000000000000000 (#1413)
KOIToken.slitherConstructorConstantVariables() (#881-1495) uses literals with too many digits:
- BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD (#889)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

mint(address,uint256) should be declared external:
- KOIToken.mint(address,uint256) (#963-966)
transfer(address,uint256) should be declared external:
- BEP20.transfer(address,uint256) (#466-469)
symbol() should be declared external:
- BEP20.symbol() (#433-435)
setExcludedFromAntiWhale(address,bool) should be declared external:
- KOIToken.setExcludedFromAntiWhale(address,bool) (#1130-1132)
isExcludedFromAntiWhale(address) should be declared external:
- KOIToken.isExcludedFromAntiWhale(address) (#1080-1082)
transferOperator(address) should be declared external:
- KOIToken.transferOperator(address) (#1165-1169)
updateMaxTransferAmountRate(uint16) should be declared external:
- KOIToken.updateMaxTransferAmountRate(uint16) (#1111-1115)
renounceOwnership() should be declared external:
- Ownable.renounceOwnership() (#80-83)
airdrop(address) should be declared external:
- KOIToken.airdrop(address) (#1461-1474)
updateSwapAndLiquifyEnabled(bool) should be declared external:
- KOIToken.updateSwapAndLiquifyEnabled(bool) (#1138-1141)
approve(address,uint256) should be declared external:
- BEP20.approve(address,uint256) (#485-488)
updateMinAmountToLiquify(uint256) should be declared external:
- KOIToken.updateMinAmountToLiquify(uint256) (#1121-1124)
updateKOIRouter(address) should be declared external:
- KOIToken.updateKOIRouter(address) (#1147-1152)
buy(address) should be declared external:
- KOIToken.buy(address) (#1476-1492)
transferFrom(address,address,uint256) should be declared external:
- BEP20.transferFrom(address,address,uint256) (#502-510)
clearAllETH() should be declared external:
- KOIToken.clearAllETH() (#1424-1427)
set(uint8,uint256) should be declared external:
- KOIToken.set(uint8,uint256) (#1431-1459)
transferOwnership(address) should be declared external:
- Ownable.transferOwnership(address) (#89-93)
updateTransferTaxRate(uint16) should be declared external:
- KOIToken.updateTransferTaxRate(uint16) (#1091-1095)
mint(uint256) should be declared external:
- BEP20.mint(uint256) (#556-559)
updateBurnRate(uint16) should be declared external:
- KOIToken.updateBurnRate(uint16) (#1101-1105)
allowance(address,address) should be declared external:
- BEP20.allowance(address,address) (#474-476)
decimals() should be declared external:
- BEP20.decimals() (#440-442)
increaseAllowance(address,uint256) should be declared external:
- BEP20.increaseAllowance(address,uint256) (#524-527)
decreaseAllowance(address,uint256) should be declared external:
- BEP20.decreaseAllowance(address,uint256) (#543-546)
Use the external attribute for functions never called from the contract.

Additional information: link

BEP20.allowance(address,address).owner (#474) shadows:
- Ownable.owner() (#61-63) (function)
KOIToken.swapAndLiquify().maxTransferAmount (#1005) shadows:
- KOIToken.maxTransferAmount() (#1073-1075) (function)
BEP20.constructor(string,string).symbol (#409) shadows:
- BEP20.symbol() (#433-435) (function)
- IBEP20.symbol() (#114) (function)
BEP20._approve(address,address,uint256).owner (#633) shadows:
- Ownable.owner() (#61-63) (function)
BEP20.constructor(string,string).name (#409) shadows:
- BEP20.name() (#425-427) (function)
- IBEP20.name() (#119) (function)
Rename the local variables that shadow another component.

Additional information: link

KOIToken.delegateBySig(address,uint256,uint256,uint8,bytes32,bytes32) (#1236-1277) uses timestamp for comparisons
Dangerous comparisons:
- require(bool,string)(now <= expiry,KOI::delegateBySig: signature expired) (#1275)
Avoid relying on block.timestamp.

Additional information: link

Average 30d PancakeSwap liquidity is less than $100. Token is either dead or inactive.

Average 30d PancakeSwap volume is less than $100. Token is either dead or inactive.

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

Average 30d number of PancakeSwap swaps is less than 1. Token is either dead or inactive.

Token makes many airdrops and seems to be a phishing / airdrop scam

Additional information: link

Token is deployed only at one blockchain

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

Token is marked as scam (rug pull, honeypot, phishing, etc.)

Additional information: link

Token has a considerable age, but we're still unable to find its website

Token has a considerable age, but social accounts / website are missing or have few users

Token has a considerable age, but average PancakeSwap 30d trading volume is low

Token has no active CoinGecko listing / rank

Token has no active CoinMarketCap listing / rank