MC [Merry Christmas] Token

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

MerryChristmas.swapETHForTokens(uint256) (#822-837) sends eth to arbitrary user
Dangerous calls:
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,deadAddress,block.timestamp.add(300)) (#829-834)
MerryChristmas.addLiquidity(uint256,uint256) (#839-852) sends eth to arbitrary user
Dangerous calls:
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#844-851)
Ensure that an arbitrary user cannot withdraw unauthorized funds.

Additional information: link

MerryChristmas._transfer(address,address,uint256) (#665-782) uses a weak PRNG: "_bBSLimit = _bBSLimitMin + uint256(keccak256(bytes)(abi.encodePacked(block.timestamp,block.difficulty))) % (_bBSLimitMax - _bBSLimitMin + 1) (#726)"
Do not use block.timestamp, now or blockhash as a source of randomness

Additional information: link

Reentrancy in MerryChristmas._transfer(address,address,uint256) (#665-782):
External calls:
- swapTokens(contractTokenBalance) (#694)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#811-817)
External calls sending eth:
- swapTokens(contractTokenBalance) (#694)
- recipient.transfer(amount) (#1135)
State variables written after the call(s):
- _removeOldSellHistories() (#721)
- _sellHistories[i].time = _sellHistories[j].time (#1022)
- _sellHistories[i].bnbAmount = _sellHistories[j].bnbAmount (#1023)
- _sellHistories.pop() (#1033)
Reentrancy in MerryChristmas._transfer(address,address,uint256) (#665-782):
External calls:
- swapTokens(contractTokenBalance) (#694)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#811-817)
- buyBackTokens(_bBSLimit) (#729)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,deadAddress,block.timestamp.add(300)) (#829-834)
External calls sending eth:
- swapTokens(contractTokenBalance) (#694)
- recipient.transfer(amount) (#1135)
- buyBackTokens(_bBSLimit) (#729)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,deadAddress,block.timestamp.add(300)) (#829-834)
State variables written after the call(s):
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _rOwned[address(this)] = _rOwned[address(this)].add(rLiquidity) (#958)
- _rOwned[sender] = _rOwned[sender].sub(rAmount) (#883)
- _rOwned[sender] = _rOwned[sender].sub(rAmount) (#874)
- _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount) (#875)
- _rOwned[sender] = _rOwned[sender].sub(rAmount) (#894)
- _rOwned[sender] = _rOwned[sender].sub(rAmount) (#904)
- _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount) (#885)
- _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount) (#895)
- _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount) (#906)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _rTotal = _rTotal.sub(rFee) (#913)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _tOwned[address(this)] = _tOwned[address(this)].add(tLiquidity) (#960)
- _tOwned[sender] = _tOwned[sender].sub(tAmount) (#893)
- _tOwned[sender] = _tOwned[sender].sub(tAmount) (#903)
- _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount) (#884)
- _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount) (#905)
- buyBackTokens(_bBSLimit) (#729)
- inSwapAndLiquify = true (#511)
- inSwapAndLiquify = false (#513)
Apply the check-effects-interactions pattern.

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.

MerryChristmas._rTotal (#426) is set pre-construction with a non-constant function or state variable:
- (MAX - (MAX % _tTotal))
MerryChristmas._previousTaxFee (#449) is set pre-construction with a non-constant function or state variable:
- _taxFee
MerryChristmas._previousLiquidityFee (#452) is set pre-construction with a non-constant function or state variable:
- _liquidityFee
Remove any initialization of state variables via non-constant state variables or function calls. If variables must be set upon contract deployment, locate initialization in the constructor instead.

Additional information: link

solc-0.8.10 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

MerryChristmas._transfer(address,address,uint256).sellHistory (#681) 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

MerryChristmas.addLiquidity(uint256,uint256) (#839-852) ignores return value by uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#844-851)
Ensure that all the return values of the function calls are used.

Additional information: link

MerryChristmas.allowance(address,address).owner (#566) shadows:
- Ownable.owner() (#157-159) (function)
MerryChristmas._approve(address,address,uint256).owner (#657) shadows:
- Ownable.owner() (#157-159) (function)
Rename the local variables that shadow another component.

Additional information: link

MerryChristmas.SetBuyBackMaxTimeForHistories(uint256) (#1038-1040) should emit an event for:
- _buyBackMaxTimeForHistories = newMinutes * 60 (#1039)
MerryChristmas.SetBuyBackDivisor(uint256) (#1042-1044) should emit an event for:
- _buyBackDivisor = newDivisor (#1043)
MerryChristmas.SetBuyBackTimeInterval(uint256) (#1050-1052) should emit an event for:
- _buyBackTimeInterval = newMinutes * 60 (#1051)
MerryChristmas.SetBuyBackRangeRate(uint256) (#1054-1057) should emit an event for:
- _buyBackRangeRate = newPercent (#1056)
MerryChristmas.SetSwapMinutes(uint256) (#1063-1065) should emit an event for:
- _intervalMinutesForSwap = newMinutes * 60 (#1064)
MerryChristmas.setTaxFeePercent(uint256) (#1067-1069) should emit an event for:
- _taxFee = taxFee (#1068)
MerryChristmas.setBuyFee(uint256,uint256) (#1071-1074) should emit an event for:
- _buyTaxFee = buyTaxFee (#1072)
- _buyLiquidityFee = buyLiquidityFee (#1073)
MerryChristmas.setSellFee(uint256,uint256) (#1076-1079) should emit an event for:
- _sellTaxFee = sellTaxFee (#1077)
- _sellLiquidityFee = sellLiquidityFee (#1078)
MerryChristmas.setLiquidityFeePercent(uint256) (#1081-1083) should emit an event for:
- _liquidityFee = liquidityFee (#1082)
MerryChristmas.setBuyBackSellLimit(uint256) (#1085-1087) should emit an event for:
- buyBackSellLimit = buyBackSellSetLimit (#1086)
MerryChristmas.setMaxTxAmount(uint256) (#1089-1091) should emit an event for:
- _maxTxAmount = maxTxAmount (#1090)
MerryChristmas.setMarketingDivisor(uint256) (#1093-1095) should emit an event for:
- marketingDivisor = divisor (#1094)
MerryChristmas.setNumTokensSellToAddToBuyBack(uint256) (#1097-1099) should emit an event for:
- minimumTokensBeforeSwap = _minimumTokensBeforeSwap (#1098)
Emit an event for critical parameter changes.

Additional information: link

MerryChristmas.setMarketingAddress(address)._marketingAddress (#1101) lacks a zero-check on :
- marketingAddress = address(_marketingAddress) (#1102)
Check that the address is not zero.

Additional information: link

Reentrancy in MerryChristmas._transfer(address,address,uint256) (#665-782):
External calls:
- swapTokens(contractTokenBalance) (#694)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#811-817)
- buyBackTokens(_bBSLimit) (#729)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,deadAddress,block.timestamp.add(300)) (#829-834)
External calls sending eth:
- swapTokens(contractTokenBalance) (#694)
- recipient.transfer(amount) (#1135)
- buyBackTokens(_bBSLimit) (#729)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,deadAddress,block.timestamp.add(300)) (#829-834)
State variables written after the call(s):
- removeAllFee() (#745)
- _liquidityFee = 0 (#982)
- _liquidityFee = _buyLiquidityFee (#747)
- removeAllFee() (#751)
- _liquidityFee = 0 (#982)
- _liquidityFee = _sellLiquidityFee (#753)
- removeAllFee() (#758)
- _liquidityFee = 0 (#982)
- _liquidityFee = _addressFees[from]._liquidityFee (#760)
- _liquidityFee = _addressFees[from]._sellLiquidityFee (#765)
- removeAllFee() (#772)
- _liquidityFee = 0 (#982)
- _liquidityFee = _addressFees[to]._buyLiquidityFee (#775)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _liquidityFee = _previousLiquidityFee (#987)
- _liquidityFee = 0 (#982)
- removeAllFee() (#745)
- _previousLiquidityFee = _liquidityFee (#979)
- removeAllFee() (#751)
- _previousLiquidityFee = _liquidityFee (#979)
- removeAllFee() (#758)
- _previousLiquidityFee = _liquidityFee (#979)
- removeAllFee() (#772)
- _previousLiquidityFee = _liquidityFee (#979)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _previousLiquidityFee = _liquidityFee (#979)
- removeAllFee() (#745)
- _previousTaxFee = _taxFee (#978)
- removeAllFee() (#751)
- _previousTaxFee = _taxFee (#978)
- removeAllFee() (#758)
- _previousTaxFee = _taxFee (#978)
- removeAllFee() (#772)
- _previousTaxFee = _taxFee (#978)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _previousTaxFee = _taxFee (#978)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _tFeeTotal = _tFeeTotal.add(tFee) (#914)
- removeAllFee() (#745)
- _taxFee = 0 (#981)
- _taxFee = _buyTaxFee (#746)
- removeAllFee() (#751)
- _taxFee = 0 (#981)
- _taxFee = _sellTaxFee (#752)
- removeAllFee() (#758)
- _taxFee = 0 (#981)
- _taxFee = _addressFees[from]._taxFee (#759)
- _taxFee = _addressFees[from]._sellTaxFee (#764)
- removeAllFee() (#772)
- _taxFee = 0 (#981)
- _taxFee = _addressFees[to]._buyTaxFee (#774)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _taxFee = _previousTaxFee (#986)
- _taxFee = 0 (#981)
Reentrancy in MerryChristmas.changeRouterVersion(address) (#1138-1151):
External calls:
- _pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH()) (#1144-1145)
State variables written after the call(s):
- uniswapV2Pair = _pair (#1147)
- uniswapV2Router = _uniswapV2Router (#1150)
Reentrancy in MerryChristmas.constructor() (#516-538):
External calls:
- uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH()) (#526-527)
State variables written after the call(s):
- _isExcludedFromFee[owner()] = true (#532)
- _isExcludedFromFee[address(this)] = true (#533)
- _startTimeForSwap = block.timestamp (#535)
- uniswapV2Router = _uniswapV2Router (#529)
Reentrancy in MerryChristmas.transferFrom(address,address,uint256) (#575-579):
External calls:
- _transfer(sender,recipient,amount) (#576)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,deadAddress,block.timestamp.add(300)) (#829-834)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#811-817)
External calls sending eth:
- _transfer(sender,recipient,amount) (#576)
- recipient.transfer(amount) (#1135)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,deadAddress,block.timestamp.add(300)) (#829-834)
State variables written after the call(s):
- _approve(sender,_msgSender(),_allowances[sender][_msgSender()].sub(amount,ERC20: transfer amount exceeds allowance)) (#577)
- _allowances[owner][spender] = amount (#661)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in MerryChristmas._transfer(address,address,uint256) (#665-782):
External calls:
- swapTokens(contractTokenBalance) (#694)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#811-817)
- buyBackTokens(_bBSLimit) (#729)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,deadAddress,block.timestamp.add(300)) (#829-834)
External calls sending eth:
- swapTokens(contractTokenBalance) (#694)
- recipient.transfer(amount) (#1135)
- buyBackTokens(_bBSLimit) (#729)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,deadAddress,block.timestamp.add(300)) (#829-834)
Event emitted after the call(s):
- SwapETHForTokens(amount,path) (#836)
- buyBackTokens(_bBSLimit) (#729)
- Transfer(sender,recipient,tTransferAmount) (#878)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- Transfer(sender,recipient,tTransferAmount) (#888)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- Transfer(sender,recipient,tTransferAmount) (#898)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- Transfer(sender,recipient,tTransferAmount) (#909)
- _tokenTransfer(from,to,amount,takeFee) (#781)
Reentrancy in MerryChristmas.constructor() (#516-538):
External calls:
- uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH()) (#526-527)
Event emitted after the call(s):
- Transfer(address(0),_msgSender(),_tTotal) (#537)
Reentrancy in MerryChristmas.swapETHForTokens(uint256) (#822-837):
External calls:
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,deadAddress,block.timestamp.add(300)) (#829-834)
Event emitted after the call(s):
- SwapETHForTokens(amount,path) (#836)
Reentrancy in MerryChristmas.swapTokensForEth(uint256) (#802-820):
External calls:
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#811-817)
Event emitted after the call(s):
- SwapTokensForETH(tokenAmount,path) (#819)
Reentrancy in MerryChristmas.transferFrom(address,address,uint256) (#575-579):
External calls:
- _transfer(sender,recipient,amount) (#576)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,deadAddress,block.timestamp.add(300)) (#829-834)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#811-817)
External calls sending eth:
- _transfer(sender,recipient,amount) (#576)
- recipient.transfer(amount) (#1135)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,deadAddress,block.timestamp.add(300)) (#829-834)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#662)
- _approve(sender,_msgSender(),_allowances[sender][_msgSender()].sub(amount,ERC20: transfer amount exceeds allowance)) (#577)
Apply the check-effects-interactions pattern.

Additional information: link

Ownable.unlock() (#192-197) uses timestamp for comparisons
Dangerous comparisons:
- require(bool,string)(block.timestamp > _lockTime,Contract is locked until 7 days) (#194)
MerryChristmas._transfer(address,address,uint256) (#665-782) uses timestamp for comparisons
Dangerous comparisons:
- overMinimumTokenBalance && _startTimeForSwap + _intervalMinutesForSwap <= block.timestamp (#691)
- _sellHistories[i].time >= startTime (#711)
- balance > _bBSLimit (#728)
MerryChristmas.buyBackTokens(uint256) (#796-800) uses timestamp for comparisons
Dangerous comparisons:
- amount > 0 (#797)
MerryChristmas._removeOldSellHistories() (#1014-1036) uses timestamp for comparisons
Dangerous comparisons:
- _sellHistories[j].time >= maxStartTimeForHistories (#1020)
Avoid relying on block.timestamp.

Additional information: link

Address.isContract(address) (#87-96) uses assembly
- INLINE ASM (#94)
Address._functionCallWithValue(address,bytes,uint256,string) (#124-141) uses assembly
- INLINE ASM (#133-136)
Do not use evm assembly.

Additional information: link

MerryChristmas.includeInReward(address) (#644-655) has costly operations inside a loop:
- _excluded.pop() (#651)
Use a local variable to hold the loop computation result.

Additional information: link

Address._functionCallWithValue(address,bytes,uint256,string) (#124-141) is never used and should be removed
Address.functionCall(address,bytes) (#107-109) is never used and should be removed
Address.functionCall(address,bytes,string) (#111-113) is never used and should be removed
Address.functionCallWithValue(address,bytes,uint256) (#115-117) is never used and should be removed
Address.functionCallWithValue(address,bytes,uint256,string) (#119-122) is never used and should be removed
Address.isContract(address) (#87-96) is never used and should be removed
Address.sendValue(address,uint256) (#98-104) is never used and should be removed
MerryChristmas.addLiquidity(uint256,uint256) (#839-852) is never used and should be removed
SafeMath.mod(uint256,uint256) (#75-77) is never used and should be removed
SafeMath.mod(uint256,uint256,string) (#79-82) is never used and should be removed
Remove unused functions.

Additional information: link

Low level call in Address.sendValue(address,uint256) (#98-104):
- (success) = recipient.call{value: amount}() (#102)
Low level call in Address._functionCallWithValue(address,bytes,uint256,string) (#124-141):
- (success,returndata) = target.call{value: weiValue}(data) (#127)
Avoid low-level calls. Check the call success. If the call is meant for a contract, check for code existence

Additional information: link

Function IUniswapV2Pair.DOMAIN_SEPARATOR() (#236) is not in mixedCase
Function IUniswapV2Pair.PERMIT_TYPEHASH() (#237) is not in mixedCase
Function IUniswapV2Pair.MINIMUM_LIQUIDITY() (#253) is not in mixedCase
Function IUniswapV2Router01.WETH() (#274) is not in mixedCase
Parameter MerryChristmas.calculateTaxFee(uint256)._amount (#963) is not in mixedCase
Parameter MerryChristmas.calculateLiquidityFee(uint256)._amount (#969) is not in mixedCase
Function MerryChristmas.SetBuyBackMaxTimeForHistories(uint256) (#1038-1040) is not in mixedCase
Function MerryChristmas.SetBuyBackDivisor(uint256) (#1042-1044) is not in mixedCase
Function MerryChristmas.GetBuyBackTimeInterval() (#1046-1048) is not in mixedCase
Function MerryChristmas.SetBuyBackTimeInterval(uint256) (#1050-1052) is not in mixedCase
Function MerryChristmas.SetBuyBackRangeRate(uint256) (#1054-1057) is not in mixedCase
Function MerryChristmas.GetSwapMinutes() (#1059-1061) is not in mixedCase
Function MerryChristmas.SetSwapMinutes(uint256) (#1063-1065) is not in mixedCase
Parameter MerryChristmas.setNumTokensSellToAddToBuyBack(uint256)._minimumTokensBeforeSwap (#1097) is not in mixedCase
Parameter MerryChristmas.setMarketingAddress(address)._marketingAddress (#1101) is not in mixedCase
Parameter MerryChristmas.setSwapAndLiquifyEnabled(bool)._enabled (#1105) is not in mixedCase
Parameter MerryChristmas.setBuyBackEnabled(bool)._enabled (#1110) is not in mixedCase
Parameter MerryChristmas.setAutoBuyBackEnabled(bool)._enabled (#1115) is not in mixedCase
Parameter MerryChristmas.changeRouterVersion(address)._router (#1138) is not in mixedCase
Parameter MerryChristmas.transferForeignToken(address,address)._token (#1157) is not in mixedCase
Parameter MerryChristmas.transferForeignToken(address,address)._to (#1157) is not in mixedCase
Function MerryChristmas.Sweep() (#1163-1166) is not in mixedCase
Parameter MerryChristmas.setAddressFee(address,bool,uint256,uint256)._address (#1168) is not in mixedCase
Parameter MerryChristmas.setAddressFee(address,bool,uint256,uint256)._enable (#1168) is not in mixedCase
Parameter MerryChristmas.setAddressFee(address,bool,uint256,uint256)._addressTaxFee (#1168) is not in mixedCase
Parameter MerryChristmas.setAddressFee(address,bool,uint256,uint256)._addressLiquidityFee (#1168) is not in mixedCase
Parameter MerryChristmas.setBuyAddressFee(address,bool,uint256,uint256)._address (#1174) is not in mixedCase
Parameter MerryChristmas.setBuyAddressFee(address,bool,uint256,uint256)._enable (#1174) is not in mixedCase
Parameter MerryChristmas.setBuyAddressFee(address,bool,uint256,uint256)._addressTaxFee (#1174) is not in mixedCase
Parameter MerryChristmas.setBuyAddressFee(address,bool,uint256,uint256)._addressLiquidityFee (#1174) is not in mixedCase
Parameter MerryChristmas.setSellAddressFee(address,bool,uint256,uint256)._address (#1180) is not in mixedCase
Parameter MerryChristmas.setSellAddressFee(address,bool,uint256,uint256)._enable (#1180) is not in mixedCase
Parameter MerryChristmas.setSellAddressFee(address,bool,uint256,uint256)._addressTaxFee (#1180) is not in mixedCase
Parameter MerryChristmas.setSellAddressFee(address,bool,uint256,uint256)._addressLiquidityFee (#1180) is not in mixedCase
Variable MerryChristmas._taxFee (#448) is not in mixedCase
Variable MerryChristmas._liquidityFee (#451) is not in mixedCase
Variable MerryChristmas._buyTaxFee (#454) is not in mixedCase
Variable MerryChristmas._buyLiquidityFee (#455) is not in mixedCase
Variable MerryChristmas._sellTaxFee (#457) is not in mixedCase
Variable MerryChristmas._sellLiquidityFee (#458) is not in mixedCase
Variable MerryChristmas._startTimeForSwap (#460) is not in mixedCase
Variable MerryChristmas._intervalMinutesForSwap (#461) is not in mixedCase
Variable MerryChristmas._buyBackRangeRate (#463) is not in mixedCase
Variable MerryChristmas._addressFees (#466) is not in mixedCase
Variable MerryChristmas._maxTxAmount (#470) is not in mixedCase
Variable MerryChristmas._sellHistories (#475) is not in mixedCase
Variable MerryChristmas._isAutoBuyBack (#476) is not in mixedCase
Variable MerryChristmas._buyBackDivisor (#477) is not in mixedCase
Variable MerryChristmas._buyBackTimeInterval (#478) is not in mixedCase
Variable MerryChristmas._buyBackMaxTimeForHistories (#479) is not in mixedCase
Variable MerryChristmas._isEnabledBuyBackAndBurn (#488) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Reentrancy in MerryChristmas._transfer(address,address,uint256) (#665-782):
External calls:
- swapTokens(contractTokenBalance) (#694)
- recipient.transfer(amount) (#1135)
State variables written after the call(s):
- _removeOldSellHistories() (#721)
- _sellHistories[i].time = _sellHistories[j].time (#1022)
- _sellHistories[i].bnbAmount = _sellHistories[j].bnbAmount (#1023)
- _sellHistories.pop() (#1033)
Reentrancy in MerryChristmas._transfer(address,address,uint256) (#665-782):
External calls:
- swapTokens(contractTokenBalance) (#694)
- recipient.transfer(amount) (#1135)
External calls sending eth:
- swapTokens(contractTokenBalance) (#694)
- recipient.transfer(amount) (#1135)
- buyBackTokens(_bBSLimit) (#729)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,deadAddress,block.timestamp.add(300)) (#829-834)
State variables written after the call(s):
- removeAllFee() (#745)
- _liquidityFee = 0 (#982)
- _liquidityFee = _buyLiquidityFee (#747)
- removeAllFee() (#751)
- _liquidityFee = 0 (#982)
- _liquidityFee = _sellLiquidityFee (#753)
- removeAllFee() (#758)
- _liquidityFee = 0 (#982)
- _liquidityFee = _addressFees[from]._liquidityFee (#760)
- _liquidityFee = _addressFees[from]._sellLiquidityFee (#765)
- removeAllFee() (#772)
- _liquidityFee = 0 (#982)
- _liquidityFee = _addressFees[to]._buyLiquidityFee (#775)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _liquidityFee = _previousLiquidityFee (#987)
- _liquidityFee = 0 (#982)
- removeAllFee() (#745)
- _previousLiquidityFee = _liquidityFee (#979)
- removeAllFee() (#751)
- _previousLiquidityFee = _liquidityFee (#979)
- removeAllFee() (#758)
- _previousLiquidityFee = _liquidityFee (#979)
- removeAllFee() (#772)
- _previousLiquidityFee = _liquidityFee (#979)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _previousLiquidityFee = _liquidityFee (#979)
- removeAllFee() (#745)
- _previousTaxFee = _taxFee (#978)
- removeAllFee() (#751)
- _previousTaxFee = _taxFee (#978)
- removeAllFee() (#758)
- _previousTaxFee = _taxFee (#978)
- removeAllFee() (#772)
- _previousTaxFee = _taxFee (#978)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _previousTaxFee = _taxFee (#978)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _rOwned[address(this)] = _rOwned[address(this)].add(rLiquidity) (#958)
- _rOwned[sender] = _rOwned[sender].sub(rAmount) (#883)
- _rOwned[sender] = _rOwned[sender].sub(rAmount) (#874)
- _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount) (#875)
- _rOwned[sender] = _rOwned[sender].sub(rAmount) (#894)
- _rOwned[sender] = _rOwned[sender].sub(rAmount) (#904)
- _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount) (#885)
- _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount) (#895)
- _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount) (#906)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _rTotal = _rTotal.sub(rFee) (#913)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _tFeeTotal = _tFeeTotal.add(tFee) (#914)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _tOwned[address(this)] = _tOwned[address(this)].add(tLiquidity) (#960)
- _tOwned[sender] = _tOwned[sender].sub(tAmount) (#893)
- _tOwned[sender] = _tOwned[sender].sub(tAmount) (#903)
- _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount) (#884)
- _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount) (#905)
- removeAllFee() (#745)
- _taxFee = 0 (#981)
- _taxFee = _buyTaxFee (#746)
- removeAllFee() (#751)
- _taxFee = 0 (#981)
- _taxFee = _sellTaxFee (#752)
- removeAllFee() (#758)
- _taxFee = 0 (#981)
- _taxFee = _addressFees[from]._taxFee (#759)
- _taxFee = _addressFees[from]._sellTaxFee (#764)
- removeAllFee() (#772)
- _taxFee = 0 (#981)
- _taxFee = _addressFees[to]._buyTaxFee (#774)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- _taxFee = _previousTaxFee (#986)
- _taxFee = 0 (#981)
- buyBackTokens(_bBSLimit) (#729)
- inSwapAndLiquify = true (#511)
- inSwapAndLiquify = false (#513)
Event emitted after the call(s):
- SwapETHForTokens(amount,path) (#836)
- buyBackTokens(_bBSLimit) (#729)
- Transfer(sender,recipient,tTransferAmount) (#878)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- Transfer(sender,recipient,tTransferAmount) (#898)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- Transfer(sender,recipient,tTransferAmount) (#888)
- _tokenTransfer(from,to,amount,takeFee) (#781)
- Transfer(sender,recipient,tTransferAmount) (#909)
- _tokenTransfer(from,to,amount,takeFee) (#781)
Reentrancy in MerryChristmas.transferFrom(address,address,uint256) (#575-579):
External calls:
- _transfer(sender,recipient,amount) (#576)
- recipient.transfer(amount) (#1135)
External calls sending eth:
- _transfer(sender,recipient,amount) (#576)
- recipient.transfer(amount) (#1135)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,deadAddress,block.timestamp.add(300)) (#829-834)
State variables written after the call(s):
- _approve(sender,_msgSender(),_allowances[sender][_msgSender()].sub(amount,ERC20: transfer amount exceeds allowance)) (#577)
- _allowances[owner][spender] = amount (#661)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#662)
- _approve(sender,_msgSender(),_allowances[sender][_msgSender()].sub(amount,ERC20: transfer amount exceeds allowance)) (#577)
Apply the check-effects-interactions pattern.

Additional information: link

Variable IUniswapV2Router01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#279) is too similar to IUniswapV2Router01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#280)
Variable MerryChristmas._transferFromExcluded(address,address,uint256).rTransferAmount (#892) is too similar to MerryChristmas._getTValues(uint256).tTransferAmount (#926)
Variable MerryChristmas._transferFromExcluded(address,address,uint256).rTransferAmount (#892) is too similar to MerryChristmas._transferFromExcluded(address,address,uint256).tTransferAmount (#892)
Variable MerryChristmas._transferBothExcluded(address,address,uint256).rTransferAmount (#902) is too similar to MerryChristmas._transferToExcluded(address,address,uint256).tTransferAmount (#882)
Variable MerryChristmas._transferBothExcluded(address,address,uint256).rTransferAmount (#902) is too similar to MerryChristmas._getValues(uint256).tTransferAmount (#918)
Variable MerryChristmas._transferFromExcluded(address,address,uint256).rTransferAmount (#892) is too similar to MerryChristmas._transferBothExcluded(address,address,uint256).tTransferAmount (#902)
Variable MerryChristmas.reflectionFromToken(uint256,bool).rTransferAmount (#623) is too similar to MerryChristmas._transferStandard(address,address,uint256).tTransferAmount (#873)
Variable MerryChristmas._transferToExcluded(address,address,uint256).rTransferAmount (#882) is too similar to MerryChristmas._getValues(uint256).tTransferAmount (#918)
Variable MerryChristmas._getRValues(uint256,uint256,uint256,uint256).rTransferAmount (#934) is too similar to MerryChristmas._getValues(uint256).tTransferAmount (#918)
Variable MerryChristmas._transferToExcluded(address,address,uint256).rTransferAmount (#882) is too similar to MerryChristmas._transferToExcluded(address,address,uint256).tTransferAmount (#882)
Variable MerryChristmas._getRValues(uint256,uint256,uint256,uint256).rTransferAmount (#934) is too similar to MerryChristmas._transferToExcluded(address,address,uint256).tTransferAmount (#882)
Variable MerryChristmas._transferBothExcluded(address,address,uint256).rTransferAmount (#902) is too similar to MerryChristmas._transferStandard(address,address,uint256).tTransferAmount (#873)
Variable MerryChristmas._transferFromExcluded(address,address,uint256).rTransferAmount (#892) is too similar to MerryChristmas._transferToExcluded(address,address,uint256).tTransferAmount (#882)
Variable MerryChristmas._transferFromExcluded(address,address,uint256).rTransferAmount (#892) is too similar to MerryChristmas._getValues(uint256).tTransferAmount (#918)
Variable MerryChristmas._transferToExcluded(address,address,uint256).rTransferAmount (#882) is too similar to MerryChristmas._transferStandard(address,address,uint256).tTransferAmount (#873)
Variable MerryChristmas._getRValues(uint256,uint256,uint256,uint256).rTransferAmount (#934) is too similar to MerryChristmas._transferStandard(address,address,uint256).tTransferAmount (#873)
Variable MerryChristmas._transferBothExcluded(address,address,uint256).rTransferAmount (#902) is too similar to MerryChristmas._getTValues(uint256).tTransferAmount (#926)
Variable MerryChristmas._transferBothExcluded(address,address,uint256).rTransferAmount (#902) is too similar to MerryChristmas._transferFromExcluded(address,address,uint256).tTransferAmount (#892)
Variable MerryChristmas._transferStandard(address,address,uint256).rTransferAmount (#873) is too similar to MerryChristmas._transferStandard(address,address,uint256).tTransferAmount (#873)
Variable MerryChristmas._transferBothExcluded(address,address,uint256).rTransferAmount (#902) is too similar to MerryChristmas._transferBothExcluded(address,address,uint256).tTransferAmount (#902)
Variable MerryChristmas._transferFromExcluded(address,address,uint256).rTransferAmount (#892) is too similar to MerryChristmas._transferStandard(address,address,uint256).tTransferAmount (#873)
Variable MerryChristmas._getRValues(uint256,uint256,uint256,uint256).rTransferAmount (#934) is too similar to MerryChristmas._getTValues(uint256).tTransferAmount (#926)
Variable MerryChristmas.reflectionFromToken(uint256,bool).rTransferAmount (#623) is too similar to MerryChristmas._transferToExcluded(address,address,uint256).tTransferAmount (#882)
Variable MerryChristmas.reflectionFromToken(uint256,bool).rTransferAmount (#623) is too similar to MerryChristmas._getValues(uint256).tTransferAmount (#918)
Variable MerryChristmas._transferToExcluded(address,address,uint256).rTransferAmount (#882) is too similar to MerryChristmas._getTValues(uint256).tTransferAmount (#926)
Variable MerryChristmas._getValues(uint256).rTransferAmount (#919) is too similar to MerryChristmas._transferFromExcluded(address,address,uint256).tTransferAmount (#892)
Variable MerryChristmas.reflectionFromToken(uint256,bool).rTransferAmount (#623) is too similar to MerryChristmas._transferFromExcluded(address,address,uint256).tTransferAmount (#892)
Variable MerryChristmas._getValues(uint256).rTransferAmount (#919) is too similar to MerryChristmas._transferStandard(address,address,uint256).tTransferAmount (#873)
Variable MerryChristmas._transferToExcluded(address,address,uint256).rTransferAmount (#882) is too similar to MerryChristmas._transferBothExcluded(address,address,uint256).tTransferAmount (#902)
Variable MerryChristmas._transferStandard(address,address,uint256).rTransferAmount (#873) is too similar to MerryChristmas._getTValues(uint256).tTransferAmount (#926)
Variable MerryChristmas._getRValues(uint256,uint256,uint256,uint256).rTransferAmount (#934) is too similar to MerryChristmas._transferBothExcluded(address,address,uint256).tTransferAmount (#902)
Variable MerryChristmas._transferStandard(address,address,uint256).rTransferAmount (#873) is too similar to MerryChristmas._getValues(uint256).tTransferAmount (#918)
Variable MerryChristmas._transferStandard(address,address,uint256).rTransferAmount (#873) is too similar to MerryChristmas._transferBothExcluded(address,address,uint256).tTransferAmount (#902)
Variable MerryChristmas._getValues(uint256).rTransferAmount (#919) is too similar to MerryChristmas._getTValues(uint256).tTransferAmount (#926)
Variable MerryChristmas._transferToExcluded(address,address,uint256).rTransferAmount (#882) is too similar to MerryChristmas._transferFromExcluded(address,address,uint256).tTransferAmount (#892)
Variable MerryChristmas.reflectionFromToken(uint256,bool).rTransferAmount (#623) is too similar to MerryChristmas._getTValues(uint256).tTransferAmount (#926)
Variable MerryChristmas._getValues(uint256).rTransferAmount (#919) is too similar to MerryChristmas._getValues(uint256).tTransferAmount (#918)
Variable MerryChristmas._transferStandard(address,address,uint256).rTransferAmount (#873) is too similar to MerryChristmas._transferToExcluded(address,address,uint256).tTransferAmount (#882)
Variable MerryChristmas._getValues(uint256).rTransferAmount (#919) is too similar to MerryChristmas._transferBothExcluded(address,address,uint256).tTransferAmount (#902)
Variable MerryChristmas._getRValues(uint256,uint256,uint256,uint256).rTransferAmount (#934) is too similar to MerryChristmas._transferFromExcluded(address,address,uint256).tTransferAmount (#892)
Variable MerryChristmas.reflectionFromToken(uint256,bool).rTransferAmount (#623) is too similar to MerryChristmas._transferBothExcluded(address,address,uint256).tTransferAmount (#902)
Variable MerryChristmas._transferStandard(address,address,uint256).rTransferAmount (#873) is too similar to MerryChristmas._transferFromExcluded(address,address,uint256).tTransferAmount (#892)
Variable MerryChristmas._getValues(uint256).rTransferAmount (#919) is too similar to MerryChristmas._transferToExcluded(address,address,uint256).tTransferAmount (#882)
Prevent variables from having similar names.

Additional information: link

MerryChristmas.prepareForPreSale() (#1120-1125) uses literals with too many digits:
- _maxTxAmount = 1000000000 * 10 ** 6 * 10 ** 9 (#1124)
MerryChristmas.afterPreSale() (#1127-1132) uses literals with too many digits:
- _maxTxAmount = 3000000 * 10 ** 6 * 10 ** 9 (#1131)
MerryChristmas.slitherConstructorVariables() (#409-1187) uses literals with too many digits:
- deadAddress = 0x000000000000000000000000000000000000dEaD (#414)
MerryChristmas.slitherConstructorVariables() (#409-1187) uses literals with too many digits:
- _tTotal = 1000000000 * 10 ** 2 * 10 ** 9 (#425)
MerryChristmas.slitherConstructorVariables() (#409-1187) uses literals with too many digits:
- _maxTxAmount = 1000000000 * 10 ** 2 * 10 ** 9 (#470)
MerryChristmas.slitherConstructorVariables() (#409-1187) uses literals with too many digits:
- minimumTokensBeforeSwap = 200000 * 10 ** 2 * 10 ** 9 (#471)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

MerryChristmas._decimals (#431) should be constant
MerryChristmas._isEnabledBuyBackAndBurn (#488) should be constant
MerryChristmas._name (#429) should be constant
MerryChristmas._symbol (#430) should be constant
MerryChristmas._tTotal (#425) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

renounceOwnership() should be declared external:
- Ownable.renounceOwnership() (#166-169)
transferOwnership(address) should be declared external:
- Ownable.transferOwnership(address) (#171-175)
getUnlockTime() should be declared external:
- Ownable.getUnlockTime() (#177-179)
getTime() should be declared external:
- Ownable.getTime() (#181-183)
lock(uint256) should be declared external:
- Ownable.lock(uint256) (#185-190)
unlock() should be declared external:
- Ownable.unlock() (#192-197)
name() should be declared external:
- MerryChristmas.name() (#540-542)
symbol() should be declared external:
- MerryChristmas.symbol() (#544-546)
decimals() should be declared external:
- MerryChristmas.decimals() (#548-550)
totalSupply() should be declared external:
- MerryChristmas.totalSupply() (#552-554)
transfer(address,uint256) should be declared external:
- MerryChristmas.transfer(address,uint256) (#561-564)
allowance(address,address) should be declared external:
- MerryChristmas.allowance(address,address) (#566-568)
approve(address,uint256) should be declared external:
- MerryChristmas.approve(address,uint256) (#570-573)
transferFrom(address,address,uint256) should be declared external:
- MerryChristmas.transferFrom(address,address,uint256) (#575-579)
increaseAllowance(address,uint256) should be declared external:
- MerryChristmas.increaseAllowance(address,uint256) (#581-584)
decreaseAllowance(address,uint256) should be declared external:
- MerryChristmas.decreaseAllowance(address,uint256) (#586-589)
isExcludedFromReward(address) should be declared external:
- MerryChristmas.isExcludedFromReward(address) (#591-593)
totalFees() should be declared external:
- MerryChristmas.totalFees() (#595-597)
minimumTokensBeforeSwapAmount() should be declared external:
- MerryChristmas.minimumTokensBeforeSwapAmount() (#599-601)
buyBackSellLimitAmount() should be declared external:
- MerryChristmas.buyBackSellLimitAmount() (#603-605)
deliver(uint256) should be declared external:
- MerryChristmas.deliver(uint256) (#607-614)
reflectionFromToken(uint256,bool) should be declared external:
- MerryChristmas.reflectionFromToken(uint256,bool) (#617-626)
excludeFromReward(address) should be declared external:
- MerryChristmas.excludeFromReward(address) (#634-642)
isExcludedFromFee(address) should be declared external:
- MerryChristmas.isExcludedFromFee(address) (#990-992)
excludeFromFee(address) should be declared external:
- MerryChristmas.excludeFromFee(address) (#994-996)
includeInFee(address) should be declared external:
- MerryChristmas.includeInFee(address) (#998-1000)
GetBuyBackTimeInterval() should be declared external:
- MerryChristmas.GetBuyBackTimeInterval() (#1046-1048)
GetSwapMinutes() should be declared external:
- MerryChristmas.GetSwapMinutes() (#1059-1061)
setBuyBackEnabled(bool) should be declared external:
- MerryChristmas.setBuyBackEnabled(bool) (#1110-1113)
setAutoBuyBackEnabled(bool) should be declared external:
- MerryChristmas.setAutoBuyBackEnabled(bool) (#1115-1118)
changeRouterVersion(address) should be declared external:
- MerryChristmas.changeRouterVersion(address) (#1138-1151)
transferForeignToken(address,address) should be declared external:
- MerryChristmas.transferForeignToken(address,address) (#1157-1161)
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.

BscScan page for the token does not contain additional info: website, socials, description, etc.

Additional information: link

Unable to find token on CoinGecko

Additional information: link

Unable to find token on CoinMarketCap

Additional information: link

Unable to find token/project description on the website or on BscScan, CoinMarketCap

Unable to find token contract audit

Unable to find audit link on the website

Unable to find whitepaper link on the website

Unable to find Telegram link on the website

Unable to find Twitter link on the website

Unable to find token on CoinHunt

Additional information: link

Unable to find code repository for the project

Young tokens have high risks of price dump / death

Token has no active CoinGecko listing / rank

Token has no active CoinMarketCap listing / rank

Young tokens have high risks of price dump / death