MetaBC [Meta Billionaires Club] Token

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

MetaBillionairesClub.addLiquidity(uint256,uint256) (#734-747) sends eth to arbitrary user
Dangerous calls:
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
Ensure that an arbitrary user cannot withdraw unauthorized funds.

Additional information: link

Reentrancy in MetaBillionairesClub._transfer(address,address,uint256) (#643-681):
External calls:
- swapAndLiquify(contractTokenBalance) (#665)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#723-729)
External calls sending eth:
- swapAndLiquify(contractTokenBalance) (#665)
- recipient.transfer(amount) (#607)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
State variables written after the call(s):
- _balances[sender] = _balances[sender].sub(amount,Insufficient Balance) (#668)
- _balances[recipient] = _balances[recipient].add(finalAmount) (#676)
- finalAmount = takeFee(sender,recipient,amount) (#670-671)
- _balances[address(this)] = _balances[address(this)].add(feeAmount) (#761)
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.

Not a direct threat, but may indicate unreliable intentions of developer. Widespread names (e.g. Elon, King, Moon, Doge) are common among meme-tokens and scams. The allow to gain free hype and attract unexperienced investors.

Redundant expression "this (#18)" inContext (#11-21)
Remove redundant statements if they congest code but offer no value.

Additional information: link

Reentrancy in MetaBillionairesClub._transfer(address,address,uint256) (#643-681):
External calls:
- swapAndLiquify(contractTokenBalance) (#665)
- recipient.transfer(amount) (#607)
External calls sending eth:
- swapAndLiquify(contractTokenBalance) (#665)
- recipient.transfer(amount) (#607)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
State variables written after the call(s):
- _balances[sender] = _balances[sender].sub(amount,Insufficient Balance) (#668)
- _balances[recipient] = _balances[recipient].add(finalAmount) (#676)
- finalAmount = takeFee(sender,recipient,amount) (#670-671)
- _balances[address(this)] = _balances[address(this)].add(feeAmount) (#761)
Event emitted after the call(s):
- Transfer(sender,address(this),feeAmount) (#762)
- finalAmount = takeFee(sender,recipient,amount) (#670-671)
- Transfer(sender,recipient,finalAmount) (#678)
Reentrancy in MetaBillionairesClub.swapAndLiquify(uint256) (#690-712):
External calls:
- transferToAddressETH(marketingWalletAddress,amountBNBMarketing) (#705)
- recipient.transfer(amount) (#607)
- transferToAddressETH(DevWalletAddress,amountBNBDev) (#708)
- recipient.transfer(amount) (#607)
External calls sending eth:
- transferToAddressETH(marketingWalletAddress,amountBNBMarketing) (#705)
- recipient.transfer(amount) (#607)
- transferToAddressETH(DevWalletAddress,amountBNBDev) (#708)
- recipient.transfer(amount) (#607)
- addLiquidity(tokensForLP,amountBNBLiquidity) (#711)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
State variables written after the call(s):
- addLiquidity(tokensForLP,amountBNBLiquidity) (#711)
- _allowances[owner][spender] = amount (#524)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#525)
- addLiquidity(tokensForLP,amountBNBLiquidity) (#711)
Reentrancy in MetaBillionairesClub.transferFrom(address,address,uint256) (#637-641):
External calls:
- _transfer(sender,recipient,amount) (#638)
- recipient.transfer(amount) (#607)
External calls sending eth:
- _transfer(sender,recipient,amount) (#638)
- recipient.transfer(amount) (#607)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
State variables written after the call(s):
- _approve(sender,_msgSender(),_allowances[sender][_msgSender()].sub(amount,ERC20: transfer amount exceeds allowance)) (#639)
- _allowances[owner][spender] = amount (#524)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#525)
- _approve(sender,_msgSender(),_allowances[sender][_msgSender()].sub(amount,ERC20: transfer amount exceeds allowance)) (#639)
Apply the check-effects-interactions pattern.

Additional information: link

Variable IUniswapV2Router01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#251) is too similar to IUniswapV2Router01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#252)
Prevent variables from having similar names.

Additional information: link

Ownable._previousOwner (#148) is never used in MetaBillionairesClub (#379-769)
Remove unused state variables.

Additional information: link

MetaBillionairesClub.addLiquidity(uint256,uint256) (#734-747) ignores return value by uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
Ensure that all the return values of the function calls are used.

Additional information: link

MetaBillionairesClub.allowance(address,address).owner (#501) shadows:
- Ownable.owner() (#158-160) (function)
MetaBillionairesClub._approve(address,address,uint256).owner (#520) shadows:
- Ownable.owner() (#158-160) (function)
Rename the local variables that shadow another component.

Additional information: link

MetaBillionairesClub.setBuyTaxes(uint256,uint256,uint256) (#540-546) should emit an event for:
- _totalTaxIfBuying = _buyLiquidityFee.add(_buyMarketingFee).add(_buyDevFee) (#545)
MetaBillionairesClub.setSellTaxes(uint256,uint256,uint256) (#548-554) should emit an event for:
- _totalTaxIfSelling = _sellLiquidityFee.add(_sellMarketingFee).add(_sellDevFee) (#553)
MetaBillionairesClub.setDistributionSettings(uint256,uint256,uint256) (#556-562) should emit an event for:
- _liquidityShare = newLiquidityShare (#557)
- _DevShare = newDevShare (#559)
- _totalDistributionShares = _liquidityShare.add(_marketingShare).add(_DevShare) (#561)
MetaBillionairesClub.setMaxTxAmount(uint256) (#564-567) should emit an event for:
- _maxTxAmount = maxTxAmount (#566)
MetaBillionairesClub.setWalletLimit(uint256) (#577-579) should emit an event for:
- _walletMax = newLimit (#578)
MetaBillionairesClub.setNumTokensBeforeSwap(uint256) (#581-583) should emit an event for:
- minimumTokensBeforeSwap = newLimit (#582)
Emit an event for critical parameter changes.

Additional information: link

MetaBillionairesClub.setMarketingWalletAddress(address).newAddress (#585) lacks a zero-check on :
- marketingWalletAddress = address(newAddress) (#586)
MetaBillionairesClub.setDevWalletAddress(address).newAddress (#589) lacks a zero-check on :
- DevWalletAddress = address(newAddress) (#590)
Check that the address is not zero.

Additional information: link

Reentrancy in MetaBillionairesClub.changeRouterVersion(address) (#610-627):
External calls:
- newPairAddress = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH()) (#618-619)
State variables written after the call(s):
- isMarketPair[address(uniswapPair)] = true (#626)
- isWalletLimitExempt[address(uniswapPair)] = true (#625)
- uniswapPair = newPairAddress (#622)
- uniswapV2Router = _uniswapV2Router (#623)
Reentrancy in MetaBillionairesClub.constructor() (#451-479):
External calls:
- uniswapPair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH()) (#455-456)
State variables written after the call(s):
- _allowances[address(this)][address(uniswapV2Router)] = _totalSupply (#459)
- _balances[_msgSender()] = _totalSupply (#477)
- _totalDistributionShares = _liquidityShare.add(_marketingShare).add(_DevShare) (#466)
- _totalTaxIfBuying = _buyLiquidityFee.add(_buyMarketingFee).add(_buyDevFee) (#464)
- _totalTaxIfSelling = _sellLiquidityFee.add(_sellMarketingFee).add(_sellDevFee) (#465)
- isExcludedFromFee[owner()] = true (#461)
- isExcludedFromFee[address(this)] = true (#462)
- isMarketPair[address(uniswapPair)] = true (#475)
- isTxLimitExempt[owner()] = true (#472)
- isTxLimitExempt[address(this)] = true (#473)
- isWalletLimitExempt[owner()] = true (#468)
- isWalletLimitExempt[address(uniswapPair)] = true (#469)
- isWalletLimitExempt[address(this)] = true (#470)
- uniswapV2Router = _uniswapV2Router (#458)
Reentrancy in MetaBillionairesClub.swapAndLiquify(uint256) (#690-712):
External calls:
- swapTokensForEth(tokensForSwap) (#695)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#723-729)
- addLiquidity(tokensForLP,amountBNBLiquidity) (#711)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
External calls sending eth:
- transferToAddressETH(marketingWalletAddress,amountBNBMarketing) (#705)
- recipient.transfer(amount) (#607)
- transferToAddressETH(DevWalletAddress,amountBNBDev) (#708)
- recipient.transfer(amount) (#607)
- addLiquidity(tokensForLP,amountBNBLiquidity) (#711)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
State variables written after the call(s):
- addLiquidity(tokensForLP,amountBNBLiquidity) (#711)
- _allowances[owner][spender] = amount (#524)
Reentrancy in MetaBillionairesClub.transferFrom(address,address,uint256) (#637-641):
External calls:
- _transfer(sender,recipient,amount) (#638)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#723-729)
External calls sending eth:
- _transfer(sender,recipient,amount) (#638)
- recipient.transfer(amount) (#607)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
State variables written after the call(s):
- _approve(sender,_msgSender(),_allowances[sender][_msgSender()].sub(amount,ERC20: transfer amount exceeds allowance)) (#639)
- _allowances[owner][spender] = amount (#524)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in MetaBillionairesClub._transfer(address,address,uint256) (#643-681):
External calls:
- swapAndLiquify(contractTokenBalance) (#665)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#723-729)
External calls sending eth:
- swapAndLiquify(contractTokenBalance) (#665)
- recipient.transfer(amount) (#607)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
Event emitted after the call(s):
- Transfer(sender,address(this),feeAmount) (#762)
- finalAmount = takeFee(sender,recipient,amount) (#670-671)
- Transfer(sender,recipient,finalAmount) (#678)
Reentrancy in MetaBillionairesClub.constructor() (#451-479):
External calls:
- uniswapPair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH()) (#455-456)
Event emitted after the call(s):
- Transfer(address(0),_msgSender(),_totalSupply) (#478)
Reentrancy in MetaBillionairesClub.swapAndLiquify(uint256) (#690-712):
External calls:
- swapTokensForEth(tokensForSwap) (#695)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#723-729)
- addLiquidity(tokensForLP,amountBNBLiquidity) (#711)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
External calls sending eth:
- transferToAddressETH(marketingWalletAddress,amountBNBMarketing) (#705)
- recipient.transfer(amount) (#607)
- transferToAddressETH(DevWalletAddress,amountBNBDev) (#708)
- recipient.transfer(amount) (#607)
- addLiquidity(tokensForLP,amountBNBLiquidity) (#711)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#525)
- addLiquidity(tokensForLP,amountBNBLiquidity) (#711)
Reentrancy in MetaBillionairesClub.swapTokensForEth(uint256) (#714-732):
External calls:
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#723-729)
Event emitted after the call(s):
- SwapTokensForETH(tokenAmount,path) (#731)
Reentrancy in MetaBillionairesClub.transferFrom(address,address,uint256) (#637-641):
External calls:
- _transfer(sender,recipient,amount) (#638)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#723-729)
External calls sending eth:
- _transfer(sender,recipient,amount) (#638)
- recipient.transfer(amount) (#607)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#739-746)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#525)
- _approve(sender,_msgSender(),_allowances[sender][_msgSender()].sub(amount,ERC20: transfer amount exceeds allowance)) (#639)
Apply the check-effects-interactions pattern.

Additional information: link

Address.isContract(address) (#90-99) uses assembly
- INLINE ASM (#97)
Address._functionCallWithValue(address,bytes,uint256,string) (#126-143) uses assembly
- INLINE ASM (#135-138)
Do not use evm assembly.

Additional information: link

Address._functionCallWithValue(address,bytes,uint256,string) (#126-143) is never used and should be removed
Address.functionCall(address,bytes) (#109-111) is never used and should be removed
Address.functionCall(address,bytes,string) (#113-115) is never used and should be removed
Address.functionCallWithValue(address,bytes,uint256) (#117-119) is never used and should be removed
Address.functionCallWithValue(address,bytes,uint256,string) (#121-124) is never used and should be removed
Address.isContract(address) (#90-99) is never used and should be removed
Address.sendValue(address,uint256) (#101-107) is never used and should be removed
Context._msgData() (#17-20) is never used and should be removed
SafeMath.mod(uint256,uint256) (#78-80) is never used and should be removed
SafeMath.mod(uint256,uint256,string) (#82-85) is never used and should be removed
Remove unused functions.

Additional information: link

Low level call in Address.sendValue(address,uint256) (#101-107):
- (success) = recipient.call{value: amount}() (#105)
Low level call in Address._functionCallWithValue(address,bytes,uint256,string) (#126-143):
- (success,returndata) = target.call{value: weiValue}(data) (#129)
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() (#210) is not in mixedCase
Function IUniswapV2Pair.PERMIT_TYPEHASH() (#211) is not in mixedCase
Function IUniswapV2Pair.MINIMUM_LIQUIDITY() (#227) is not in mixedCase
Function IUniswapV2Router01.WETH() (#246) is not in mixedCase
Parameter MetaBillionairesClub.setSwapAndLiquifyEnabled(bool)._enabled (#593) is not in mixedCase
Variable MetaBillionairesClub.DevWalletAddress (#389) is not in mixedCase
Variable MetaBillionairesClub._balances (#392) is not in mixedCase
Variable MetaBillionairesClub._buyLiquidityFee (#400) is not in mixedCase
Variable MetaBillionairesClub._buyMarketingFee (#401) is not in mixedCase
Variable MetaBillionairesClub._buyDevFee (#402) is not in mixedCase
Variable MetaBillionairesClub._sellLiquidityFee (#403) is not in mixedCase
Variable MetaBillionairesClub._sellMarketingFee (#404) is not in mixedCase
Variable MetaBillionairesClub._sellDevFee (#405) is not in mixedCase
Variable MetaBillionairesClub._liquidityShare (#407) is not in mixedCase
Variable MetaBillionairesClub._marketingShare (#408) is not in mixedCase
Variable MetaBillionairesClub._DevShare (#409) is not in mixedCase
Variable MetaBillionairesClub._totalTaxIfBuying (#411) is not in mixedCase
Variable MetaBillionairesClub._totalTaxIfSelling (#412) is not in mixedCase
Variable MetaBillionairesClub._totalDistributionShares (#413) is not in mixedCase
Variable MetaBillionairesClub._maxTxAmount (#416) is not in mixedCase
Variable MetaBillionairesClub._walletMax (#417) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

MetaBillionairesClub.slitherConstructorVariables() (#379-769) uses literals with too many digits:
- deadAddress = 0x000000000000000000000000000000000000dEaD (#390)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

MetaBillionairesClub._decimals (#386) should be constant
MetaBillionairesClub._name (#384) should be constant
MetaBillionairesClub._symbol (#385) should be constant
MetaBillionairesClub._totalSupply (#415) should be constant
Ownable._previousOwner (#148) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

waiveOwnership() should be declared external:
- Ownable.waiveOwnership() (#167-170)
transferOwnership(address) should be declared external:
- Ownable.transferOwnership(address) (#172-176)
name() should be declared external:
- MetaBillionairesClub.name() (#481-483)
symbol() should be declared external:
- MetaBillionairesClub.symbol() (#485-487)
decimals() should be declared external:
- MetaBillionairesClub.decimals() (#489-491)
totalSupply() should be declared external:
- MetaBillionairesClub.totalSupply() (#493-495)
allowance(address,address) should be declared external:
- MetaBillionairesClub.allowance(address,address) (#501-503)
increaseAllowance(address,uint256) should be declared external:
- MetaBillionairesClub.increaseAllowance(address,uint256) (#505-508)
decreaseAllowance(address,uint256) should be declared external:
- MetaBillionairesClub.decreaseAllowance(address,uint256) (#510-513)
approve(address,uint256) should be declared external:
- MetaBillionairesClub.approve(address,uint256) (#515-518)
addMarketPair(address) should be declared external:
- MetaBillionairesClub.addMarketPair(address) (#528-530)
setIsExcludedFromFee(address,bool) should be declared external:
- MetaBillionairesClub.setIsExcludedFromFee(address,bool) (#536-538)
setSwapAndLiquifyEnabled(bool) should be declared external:
- MetaBillionairesClub.setSwapAndLiquifyEnabled(bool) (#593-596)
setSwapAndLiquifyByLimitOnly(bool) should be declared external:
- MetaBillionairesClub.setSwapAndLiquifyByLimitOnly(bool) (#598-600)
getCirculatingSupply() should be declared external:
- MetaBillionairesClub.getCirculatingSupply() (#602-604)
changeRouterVersion(address) should be declared external:
- MetaBillionairesClub.changeRouterVersion(address) (#610-627)
transfer(address,uint256) should be declared external:
- MetaBillionairesClub.transfer(address,uint256) (#632-635)
transferFrom(address,address,uint256) should be declared external:
- MetaBillionairesClub.transferFrom(address,address,uint256) (#637-641)
Use the external attribute for functions never called from the contract.

Additional information: link

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.

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 number of swaps.

Unable to find token contract audit

Unable to find audit link on the website

Unable to find code repository for the project

Young tokens have high risks of price dump / death

Young tokens have high risks of scam / price dump / death

Young tokens have high risks of price dump / death

Young tokens have high risks of price dump / death

Young tokens have high risks of price dump / death

Token has relatively low CoinGecko rank

Token has relatively low CoinMarketCap rank