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MCV [METACUPIDVERSE] Token

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MetaCupidVerse aims to build and deploy a productive platform that provides passive income, auto-staking, assisting people towards finacial freedom.

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Laser Scorebeta Last Audit: 4 February 2022

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

CUPID.swapBack() (#338-379) sends eth to arbitrary user
Dangerous calls:
- (MarketingSuccess) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#363)
- (buybackSuccess) = address(buybackFeeReceiver).call{gas: 30000,value: amountBNBbuyback}() (#365)
Ensure that an arbitrary user cannot withdraw unauthorized funds.

Additional information: link

Reentrancy in CUPID._transferFrom(address,address,uint256) (#279-299):
External calls:
- swapBack() (#288)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#349-355)
- (MarketingSuccess) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#363)
- (buybackSuccess) = address(buybackFeeReceiver).call{gas: 30000,value: amountBNBbuyback}() (#365)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,marketingFeeReceiver,block.timestamp) (#369-376)
External calls sending eth:
- swapBack() (#288)
- (MarketingSuccess) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#363)
- (buybackSuccess) = address(buybackFeeReceiver).call{gas: 30000,value: amountBNBbuyback}() (#365)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,marketingFeeReceiver,block.timestamp) (#369-376)
State variables written after the call(s):
- _balances[sender] = _balances[sender].sub(amount,Insufficient Balance) (#292)
- _balances[recipient] = _balances[recipient].add(amountReceived) (#295)
- amountReceived = takeFee(sender,recipient,amount) (#294)
- _balances[address(this)] = _balances[address(this)].add(feeAmount) (#325)
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.

CUPID.slitherConstructorVariables() (#194-463) performs a multiplication on the result of a division:
-swapThreshold = _totalSupply / 1000 * 5 (#230)
Consider ordering multiplication before division.

Additional information: link

CUPID.swapBack() (#338-379) ignores return value by router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,marketingFeeReceiver,block.timestamp) (#369-376)
Ensure that all the return values of the function calls are used.

Additional information: link

CUPID.setTxLimit(uint256) (#402-405) should emit an event for:
- _maxTxAmount = amount (#404)
CUPID.setFees(uint256,uint256,uint256,uint256) (#420-426) should emit an event for:
- liquidityFee = _liquidityFee (#421)
- buybackFee = _buybackFee (#422)
- marketingFee = _marketingFee (#423)
- totalFee = _liquidityFee.add(_buybackFee).add(_marketingFee) (#424)
- feeDenominator = _feeDenominator (#425)
Emit an event for critical parameter changes.

Additional information: link

Auth.transferOwnership(address).adr (#133) lacks a zero-check on :
- owner = adr (#134)
CUPID.setFeeReceiver(address,address)._marketingFeeReceiver (#428) lacks a zero-check on :
- marketingFeeReceiver = _marketingFeeReceiver (#429)
CUPID.setFeeReceiver(address,address)._buybackFeeReceiver (#428) lacks a zero-check on :
- buybackFeeReceiver = _buybackFeeReceiver (#430)
Check that the address is not zero.

Additional information: link

Reentrancy in CUPID._transferFrom(address,address,uint256) (#279-299):
External calls:
- swapBack() (#288)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#349-355)
- (MarketingSuccess) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#363)
- (buybackSuccess) = address(buybackFeeReceiver).call{gas: 30000,value: amountBNBbuyback}() (#365)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,marketingFeeReceiver,block.timestamp) (#369-376)
External calls sending eth:
- swapBack() (#288)
- (MarketingSuccess) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#363)
- (buybackSuccess) = address(buybackFeeReceiver).call{gas: 30000,value: amountBNBbuyback}() (#365)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,marketingFeeReceiver,block.timestamp) (#369-376)
State variables written after the call(s):
- launch() (#290)
- launchedAt = block.number (#399)
Reentrancy in CUPID.constructor() (#234-245):
External calls:
- pair = IDEXFactory(router.factory()).createPair(WBNB,address(this)) (#236)
State variables written after the call(s):
- _allowances[address(this)][address(router)] = type()(uint256).max (#237)
- _balances[_owner] = _totalSupply (#243)
- isFeeExempt[_owner] = true (#240)
- isTxLimitExempt[_owner] = true (#241)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in CUPID._transferFrom(address,address,uint256) (#279-299):
External calls:
- swapBack() (#288)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#349-355)
- (MarketingSuccess) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#363)
- (buybackSuccess) = address(buybackFeeReceiver).call{gas: 30000,value: amountBNBbuyback}() (#365)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,marketingFeeReceiver,block.timestamp) (#369-376)
External calls sending eth:
- swapBack() (#288)
- (MarketingSuccess) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#363)
- (buybackSuccess) = address(buybackFeeReceiver).call{gas: 30000,value: amountBNBbuyback}() (#365)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,marketingFeeReceiver,block.timestamp) (#369-376)
Event emitted after the call(s):
- Transfer(sender,address(this),feeAmount) (#326)
- amountReceived = takeFee(sender,recipient,amount) (#294)
- Transfer(sender,recipient,amountReceived) (#297)
Reentrancy in CUPID.constructor() (#234-245):
External calls:
- pair = IDEXFactory(router.factory()).createPair(WBNB,address(this)) (#236)
Event emitted after the call(s):
- Transfer(address(0),_owner,_totalSupply) (#244)
Reentrancy in CUPID.swapBack() (#338-379):
External calls:
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToSwap,0,path,address(this),block.timestamp) (#349-355)
- (MarketingSuccess) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#363)
- (buybackSuccess) = address(buybackFeeReceiver).call{gas: 30000,value: amountBNBbuyback}() (#365)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,marketingFeeReceiver,block.timestamp) (#369-376)
External calls sending eth:
- (MarketingSuccess) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#363)
- (buybackSuccess) = address(buybackFeeReceiver).call{gas: 30000,value: amountBNBbuyback}() (#365)
- router.addLiquidityETH{value: amountBNBLiquidity}(address(this),amountToLiquify,0,0,marketingFeeReceiver,block.timestamp) (#369-376)
Event emitted after the call(s):
- AutoLiquify(amountBNBLiquidity,amountToLiquify) (#377)
Apply the check-effects-interactions pattern.

Additional information: link

CUPID.buyTokens(uint256,address) (#381-392) is never used and should be removed
Remove unused functions.

Additional information: link

CUPID._maxTxAmount (#206) is set pre-construction with a non-constant function or state variable:
- (_totalSupply * 1) / 100
CUPID._maxWalletSize (#207) is set pre-construction with a non-constant function or state variable:
- (_totalSupply * 1) / 100
CUPID.swapThreshold (#230) is set pre-construction with a non-constant function or state variable:
- _totalSupply / 1000 * 5
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

Low level call in CUPID.swapBack() (#338-379):
- (MarketingSuccess) = address(marketingFeeReceiver).call{gas: 30000,value: amountBNBMarketing}() (#363)
- (buybackSuccess) = address(buybackFeeReceiver).call{gas: 30000,value: amountBNBbuyback}() (#365)
Avoid low-level calls. Check the call success. If the call is meant for a contract, check for code existence

Additional information: link

Function IDEXRouter.WETH() (#148) is not in mixedCase
Parameter CUPID.setFees(uint256,uint256,uint256,uint256)._liquidityFee (#420) is not in mixedCase
Parameter CUPID.setFees(uint256,uint256,uint256,uint256)._buybackFee (#420) is not in mixedCase
Parameter CUPID.setFees(uint256,uint256,uint256,uint256)._marketingFee (#420) is not in mixedCase
Parameter CUPID.setFees(uint256,uint256,uint256,uint256)._feeDenominator (#420) is not in mixedCase
Parameter CUPID.setFeeReceiver(address,address)._marketingFeeReceiver (#428) is not in mixedCase
Parameter CUPID.setFeeReceiver(address,address)._buybackFeeReceiver (#428) is not in mixedCase
Parameter CUPID.setSwapBackSettings(bool,uint256)._enabled (#433) is not in mixedCase
Parameter CUPID.setSwapBackSettings(bool,uint256)._amount (#433) is not in mixedCase
Parameter CUPID.transferForeignToken(address)._token (#443) is not in mixedCase
Variable CUPID.WBNB (#197) is not in mixedCase
Variable CUPID.DEAD (#198) is not in mixedCase
Variable CUPID.ZERO (#199) is not in mixedCase
Constant CUPID._name (#201) is not in UPPER_CASE_WITH_UNDERSCORES
Constant CUPID._symbol (#202) is not in UPPER_CASE_WITH_UNDERSCORES
Constant CUPID._decimals (#203) is not in UPPER_CASE_WITH_UNDERSCORES
Variable CUPID._totalSupply (#205) is not in mixedCase
Variable CUPID._maxTxAmount (#206) is not in mixedCase
Variable CUPID._maxWalletSize (#207) is not in mixedCase
Variable CUPID._balances (#209) is not in mixedCase
Variable CUPID._allowances (#210) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Variable IDEXRouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#153) is too similar to IDEXRouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#154)
Prevent variables from having similar names.

Additional information: link

CUPID.slitherConstructorVariables() (#194-463) uses literals with too many digits:
- DEAD = 0x000000000000000000000000000000000000dEaD (#198)
CUPID.slitherConstructorVariables() (#194-463) uses literals with too many digits:
- ZERO = 0x0000000000000000000000000000000000000000 (#199)
CUPID.slitherConstructorVariables() (#194-463) uses literals with too many digits:
- _totalSupply = 1000000000 * (10 ** _decimals) (#205)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

CUPID.DEAD (#198) should be constant
CUPID.WBNB (#197) should be constant
CUPID.ZERO (#199) should be constant
CUPID._totalSupply (#205) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

authorize(address) should be declared external:
- Auth.authorize(address) (#105-107)
unauthorize(address) should be declared external:
- Auth.unauthorize(address) (#112-114)
transferOwnership(address) should be declared external:
- Auth.transferOwnership(address) (#133-137)
transferForeignToken(address) should be declared external:
- CUPID.transferForeignToken(address) (#443-447)
isOverLiquified(uint256,uint256) should be declared external:
- CUPID.isOverLiquified(uint256,uint256) (#457-459)
Use the external attribute for functions never called from the contract.

Additional information: link

Holders:


Token seems to be untradeable: there is no PancakeSwap trading pair and no trading volumes. Ignore for presale.


Number of Binance Smart Chain (BSC) token holders is less than 100. Token is either dead or inactive.


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