GRV [Gravi] Token

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

Contract creator or owner is blacklisted for past scams

GRV.addLiquidity(uint256,uint256) (#953-967) sends eth to arbitrary user
Dangerous calls:
- uniswapV2Router.addLiquidityETH.value(ethAmount)(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#959-966)
Ensure that an arbitrary user cannot withdraw unauthorized funds.

Additional information: link

Reentrancy in GRV._transfer(address,address,uint256) (#795-830):
External calls:
- swapAndLiquify(numTokensSell) (#817)
- uniswapV2Router.addLiquidityETH.value(ethAmount)(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#959-966)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp.add(300)) (#927-933)
- buyBackTokens(buybackLimit.div(buybackDivisor)) (#823)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens.value(amount)(0,path,deadAddress,block.timestamp.add(300)) (#944-949)
External calls sending eth:
- swapAndLiquify(numTokensSell) (#817)
- recipient.transfer(amount) (#913)
- uniswapV2Router.addLiquidityETH.value(ethAmount)(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#959-966)
- buyBackTokens(buybackLimit.div(buybackDivisor)) (#823)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens.value(amount)(0,path,deadAddress,block.timestamp.add(300)) (#944-949)
State variables written after the call(s):
- _tokenTransfer(from,to,value) (#827)
- _gonBalances[sender] = _gonBalances[sender].sub(gonValue) (#853)
- _gonBalances[address(this)] = _gonBalances[address(this)].add(rFee) (#872)
- _gonBalances[recipient] = _gonBalances[recipient].add(gonValue) (#854)
- _gonBalances[sender] = _gonBalances[sender].sub(gonDeduct) (#845)
- _gonBalances[recipient] = _gonBalances[recipient].add(gonValue) (#846)
- buyBackTokens(buybackLimit.div(buybackDivisor)) (#823)
- inSwapAndLiquify = true (#628)
- inSwapAndLiquify = false (#630)
Apply the check-effects-interactions pattern.

Additional information: link

GRV.burnAutoLP() (#1074-1080) ignores return value by uniswapV2Pair.transfer(owner(),balance) (#1079)
Use SafeERC20, or ensure that the transfer/transferFrom return value is checked.

Additional information: link

Ownable._lockTime (#265) is never initialized. It is used in:
- Ownable.getUnlockTime() (#316-318)
- Ownable.unlock() (#329-334)
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

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.

Combination 2: Unchecked transfer + 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.

Combination 3: Reentrancy vulnerabilities + Unchecked transfer vulnerability. Usual for scams. May be justified by some complex mechanics (e.g. rebase, reflections). DYOR & manual audit are advised.

GRV.addLiquidity(uint256,uint256) (#953-967) ignores return value by uniswapV2Router.addLiquidityETH.value(ethAmount)(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#959-966)
Ensure that all the return values of the function calls are used.

Additional information: link

GRV._approve(address,address,uint256).owner (#988) shadows:
- Ownable.owner() (#286-288) (function)
Rename the local variables that shadow another component.

Additional information: link

GRV.setMaster(address) (#718-724) should emit an event for:
- master = _master (#723)
Emit an event for critical parameter changes.

Additional information: link

GRV.burnBNB(address).burnAddress (#1104) lacks a zero-check on :
- burnAddress.transfer(address(this).balance) (#1105)
Check that the address is not zero.

Additional information: link

Reentrancy in GRV.transferFrom(address,address,uint256) (#778-786):
External calls:
- _transfer(sender,recipient,amount) (#783)
- uniswapV2Router.addLiquidityETH.value(ethAmount)(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#959-966)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens.value(amount)(0,path,deadAddress,block.timestamp.add(300)) (#944-949)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp.add(300)) (#927-933)
External calls sending eth:
- _transfer(sender,recipient,amount) (#783)
- recipient.transfer(amount) (#913)
- uniswapV2Router.addLiquidityETH.value(ethAmount)(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#959-966)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens.value(amount)(0,path,deadAddress,block.timestamp.add(300)) (#944-949)
State variables written after the call(s):
- _approve(sender,msg.sender,_allowedFragments[sender][msg.sender].sub(amount)) (#784)
- _allowedFragments[owner][spender] = value (#992)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in GRV.transferFrom(address,address,uint256) (#778-786):
External calls:
- _transfer(sender,recipient,amount) (#783)
- uniswapV2Router.addLiquidityETH.value(ethAmount)(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#959-966)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens.value(amount)(0,path,deadAddress,block.timestamp.add(300)) (#944-949)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp.add(300)) (#927-933)
External calls sending eth:
- _transfer(sender,recipient,amount) (#783)
- recipient.transfer(amount) (#913)
- uniswapV2Router.addLiquidityETH.value(ethAmount)(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#959-966)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens.value(amount)(0,path,deadAddress,block.timestamp.add(300)) (#944-949)
Event emitted after the call(s):
- Approval(owner,spender,value) (#993)
- _approve(sender,msg.sender,_allowedFragments[sender][msg.sender].sub(amount)) (#784)
Apply the check-effects-interactions pattern.

Additional information: link

Ownable.unlock() (#329-334) uses timestamp for comparisons
Dangerous comparisons:
- require(bool,string)(now > _lockTime,Contract is locked until 7 days) (#331)
Avoid relying on block.timestamp.

Additional information: link

SafeMathInt.sub(int256,int256) (#465-473) is never used and should be removed
Remove unused functions.

Additional information: link

Parameter GRV.setnumTokensSellDivisor(uint256)._numTokensSellDivisor (#1101) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Reentrancy in GRV.transferFrom(address,address,uint256) (#778-786):
External calls:
- _transfer(sender,recipient,amount) (#783)
- recipient.transfer(amount) (#913)
External calls sending eth:
- _transfer(sender,recipient,amount) (#783)
- recipient.transfer(amount) (#913)
- uniswapV2Router.addLiquidityETH.value(ethAmount)(address(this),tokenAmount,0,0,address(this),block.timestamp.add(300)) (#959-966)
- uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens.value(amount)(0,path,deadAddress,block.timestamp.add(300)) (#944-949)
State variables written after the call(s):
- _approve(sender,msg.sender,_allowedFragments[sender][msg.sender].sub(amount)) (#784)
- _allowedFragments[owner][spender] = value (#992)
Event emitted after the call(s):
- Approval(owner,spender,value) (#993)
- _approve(sender,msg.sender,_allowedFragments[sender][msg.sender].sub(amount)) (#784)
Apply the check-effects-interactions pattern.

Additional information: link

Variable IUniswapV2Router02.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#129) is too similar to IUniswapV2Router02.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#130)
Prevent variables from having similar names.

Additional information: link

GRV.slitherConstructorVariables() (#558-1108) uses literals with too many digits:
- deadAddress = 0x000000000000000000000000000000000000dEaD (#616)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

GRV.privateSaleDropCompleted (#625) is never used in GRV (#558-1108)
Remove unused state variables.

Additional information: link

Ownable._lockTime (#265) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

setnumTokensSellDivisor(uint256) should be declared external:
- GRV.setnumTokensSellDivisor(uint256) (#1101-1102)
Use the external attribute for functions never called from the contract.

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 30d number of PancakeSwap swaps is less than 1. 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

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

Additional information: link

Token was delisted (assigned to inactive / untracked listing) from CoinMarketCap

Additional information: link

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 code repository for the project

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

Additional information: link

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

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

Token has no active CoinMarketCap listing / rank

Young tokens have high risks of price dump / death

Token has relatively low CoinGecko rank