FLIP [Flipper] Token

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

FlipperToken.swapBack() (#580-605) sends eth to arbitrary user
Dangerous calls:
- (successMarketing) = address(marketingFeeReceiver).call{gas: 3000000,value: amountBNBMarketing}() (#602)
- (successDev) = address(devFeeReceiver).call{gas: 3000000,value: amountBNBDev}() (#603)
Ensure that an arbitrary user cannot withdraw unauthorized funds.

Additional information: link

Reentrancy in FlipperToken._transferFrom(address,address,uint256) (#506-530):
External calls:
- swapBack() (#515)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#589-595)
- distributor.deposit{value: amountBNBReflection}() (#601)
- (successMarketing) = address(marketingFeeReceiver).call{gas: 3000000,value: amountBNBMarketing}() (#602)
- (successDev) = address(devFeeReceiver).call{gas: 3000000,value: amountBNBDev}() (#603)
- triggerAutoBuyback() (#516)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#648-653)
External calls sending eth:
- swapBack() (#515)
- distributor.deposit{value: amountBNBReflection}() (#601)
- (successMarketing) = address(marketingFeeReceiver).call{gas: 3000000,value: amountBNBMarketing}() (#602)
- (successDev) = address(devFeeReceiver).call{gas: 3000000,value: amountBNBDev}() (#603)
- triggerAutoBuyback() (#516)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#648-653)
State variables written after the call(s):
- _balances[sender] = _balances[sender].sub(amount,Insufficient Balance) (#518)
- _balances[recipient] = _balances[recipient].add(amountReceived) (#521)
- amountReceived = takeFee(sender,recipient,amount) (#520)
- _balances[gameContract] = _balances[gameContract].add(gameTokens) (#566)
- _balances[address(this)] = _balances[address(this)].add(feeAmount).sub(gameTokens) (#567)
- triggerAutoBuyback() (#516)
- inSwap = true (#441)
- inSwap = false (#441)
Apply the check-effects-interactions pattern.

Additional information: link

FlipperToken.rescueToken(address,address) (#757-759) ignores return value by IBEP20(token).transfer(to,IBEP20(token).balanceOf(address(this))) (#758)
Use SafeERC20, or ensure that the transfer/transferFrom return value is checked.

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.

FlipperToken.slitherConstructorVariables() (#381-802) uses literals with too many digits:
- maxGasPrice = 10000000000 (#443)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

FlipperToken.maxGasPrice (#443) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

getCirculatingSupply() should be declared external:
- FlipperToken.getCirculatingSupply() (#796-798)
Use the external attribute for functions never called from the contract.

Additional information: link

FlipperToken.takeFee(address,address,uint256) (#562-571) performs a multiplication on the result of a division:
-feeAmount = amount.mul(getTotalFee(receiver == pair)).div(feeDenominator) (#563)
-gameTokens = feeAmount.mul(gameFee).div(totalFee) (#564)
Consider ordering multiplication before division.

Additional information: link

Reentrancy in DividendDistributor.setShare(address,uint256) (#258-272):
External calls:
- distributeDividend(shareholder) (#260)
- rewardsToken.transfer(shareholder,amount) (#331)
State variables written after the call(s):
- shares[shareholder].amount = amount (#270)
- shares[shareholder].totalExcluded = getCumulativeDividends(shares[shareholder].amount) (#271)
Apply the check-effects-interactions pattern.

Additional information: link

FlipperToken.setSwapBackSettings(bool,uint256) (#727-730) should emit an event for:
- swapThreshold = _amount (#729)
Emit an event for critical parameter changes.

Additional information: link

FlipperToken.setDevFeeReceiver(address)._devFeeReceiver (#723) lacks a zero-check on :
- devFeeReceiver = _devFeeReceiver (#724)
Check that the address is not zero.

Additional information: link

FlipperToken.multiTransfer(address,address[],uint256[]) (#761-785) has external calls inside a loop: distributor.setShare(addresses[i_scope_0],balanceOf(addresses[i_scope_0])) (#777)
Favor pull over push strategy for external calls.

Additional information: link

Reentrancy in FlipperToken.triggerManualBuyback(uint256,bool) (#615-621):
External calls:
- buyTokens(amount,DEAD) (#616)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#648-653)
State variables written after the call(s):
- buybackMultiplierTriggeredAt = block.timestamp (#618)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in FlipperToken.triggerManualBuyback(uint256,bool) (#615-621):
External calls:
- buyTokens(amount,DEAD) (#616)
- router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(0,path,to,block.timestamp) (#648-653)
Event emitted after the call(s):
- BuybackMultiplierActive(buybackMultiplierLength) (#619)
Apply the check-effects-interactions pattern.

Additional information: link

FlipperToken.multiTransfer(address,address[],uint256[]) (#761-785) uses timestamp for comparisons
Dangerous comparisons:
- require(bool,string)(balanceOf(from) >= totalAirdropTokens,Not enough tokens in wallet) (#772)
Avoid relying on block.timestamp.

Additional information: link

DividendDistributor.process(uint256) (#294-318) has costly operations inside a loop:
- currentIndex ++ (#315)
Use a local variable to hold the loop computation result.

Additional information: link

FlipperToken.swapThreshold (#439) is set pre-construction with a non-constant function or state variable:
- _totalSupply / 1000
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-0.8.9 is not recommended for deployment
Deploy with any of the following Solidity versions: 0.5.16 - 0.5.17, 0.6.11 - 0.6.12, 0.7.5 - 0.7.6 Use a simple pragma version that allows any of these versions. Consider using the latest version of Solidity for testing.

Additional information: link

Low level call in FlipperToken.swapBack() (#580-605):
- (successMarketing) = address(marketingFeeReceiver).call{gas: 3000000,value: amountBNBMarketing}() (#602)
- (successDev) = address(devFeeReceiver).call{gas: 3000000,value: amountBNBDev}() (#603)
Avoid low-level calls. Check the call success. If the call is meant for a contract, check for code existence

Additional information: link

Variable FlipperToken._allowances (#397) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Variable IDEXRouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#155) is too similar to IDEXRouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#156)
Prevent variables from having similar names.

Additional information: link

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

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 token on CoinHunt

Additional information: link

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 scam / price dump / death

Token has no active CoinMarketCap listing / rank

Token has relatively low CoinGecko rank