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BackDrops Token

About BackDrops

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Laser Scorebeta Last Audit: 7 February 2022

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Reentrancy in BackDrops._transfer(address,address,uint256) (#744-797):
External calls:
- swapAndLiquify(tokensToSwap) (#777)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
- pcsV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#940-946)
External calls sending eth:
- swapAndLiquify(tokensToSwap) (#777)
- recipient.transfer(amount) (#963)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
State variables written after the call(s):
- _transferStandard(sender,recipient,amount) (#792)
- _rOwned[address(this)] = _rOwned[address(this)].add(rLiquidity) (#898)
- _rOwned[sender] = _rOwned[sender].sub(rAmount) (#801)
- _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount) (#802)
- _transferStandard(sender,recipient,amount) (#792)
- _rTotal = _rTotal.sub(rFee) (#809)
Apply the check-effects-interactions pattern.

Additional information: link

BackDrops._tOwned (#521) is never initialized. It is used in:
- BackDrops._getCurrentSupply() (#880-893)
BackDrops._excluded (#526) is never initialized. It is used in:
- BackDrops._getCurrentSupply() (#880-893)
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

BackDrops._getTValues(uint256) (#837-852) performs a multiplication on the result of a division:
-tFee = tAmount.div(10 ** 2).mul(_taxFee).mul(multiplier) (#847)
BackDrops._getTValues(uint256) (#837-852) performs a multiplication on the result of a division:
-tLiquidity = tAmount.div(10 ** 2).mul(_liquidityFee).mul(multiplier) (#848-849)
BackDrops.swapAndLiquify(uint256) (#901-931) performs a multiplication on the result of a division:
-liquidtyPortion = contractTokenBalance.div(10 ** 2).mul(40) (#903)
BackDrops.slitherConstructorVariables() (#517-968) performs a multiplication on the result of a division:
-_maxWallet = _tTotal.div(10 ** 2).mul(100) (#535)
Consider ordering multiplication before division.

Additional information: link

BackDrops._transfer(address,address,uint256) (#744-797) uses tx.origin for authorization: require(bool,string)(balanceOf(tx.origin) + amount <= _maxWallet,Exceeds maximum wallet token amount) (#759-763)
Do not use tx.origin for authorization.

Additional information: link

BackDrops.addLiquidity(uint256,uint256) (#949-960) ignores return value by pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
Ensure that all the return values of the function calls are used.

Additional information: link

BackDrops.allowance(address,address).owner (#645) shadows:
- Ownable.owner() (#134-136) (function)
BackDrops._approve(address,address,uint256).owner (#710) shadows:
- Ownable.owner() (#134-136) (function)
Rename the local variables that shadow another component.

Additional information: link

Reentrancy in BackDrops._transfer(address,address,uint256) (#744-797):
External calls:
- swapAndLiquify(tokensToSwap) (#777)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
- pcsV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#940-946)
External calls sending eth:
- swapAndLiquify(tokensToSwap) (#777)
- recipient.transfer(amount) (#963)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
State variables written after the call(s):
- removeAllFee() (#790)
- _liquidityFee = 0 (#728)
- restoreAllFee() (#794)
- _liquidityFee = _previousLiquidityFee (#741)
- turnOffPenalties() (#796)
- _penaltiesEnabled = false (#732)
- removeAllFee() (#790)
- _previousLiquidityFee = _liquidityFee (#725)
- removeAllFee() (#790)
- _previousTaxFee = _taxFee (#724)
- _transferStandard(sender,recipient,amount) (#792)
- _tFeeTotal = _tFeeTotal.add(tFee) (#810)
- removeAllFee() (#790)
- _taxFee = 0 (#727)
- restoreAllFee() (#794)
- _taxFee = _previousTaxFee (#740)
Reentrancy in BackDrops.constructor() (#562-576):
External calls:
- pcsV2Pair = IPancakeFactory(_pancakeswapV2Router.factory()).createPair(address(this),_pancakeswapV2Router.WETH()) (#569-572)
State variables written after the call(s):
- pcsV2Router = _pancakeswapV2Router (#573)
Reentrancy in BackDrops.swapAndLiquify(uint256) (#901-931):
External calls:
- swapTokensForBNB(half) (#911)
- pcsV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#940-946)
- addLiquidity(otherHalf,newBalanceFromLiquify) (#915)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
External calls sending eth:
- addLiquidity(otherHalf,newBalanceFromLiquify) (#915)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
State variables written after the call(s):
- addLiquidity(otherHalf,newBalanceFromLiquify) (#915)
- _allowances[owner][spender] = amount (#717)
Reentrancy in BackDrops.swapAndLiquify(uint256) (#901-931):
External calls:
- swapTokensForBNB(half) (#911)
- pcsV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#940-946)
- addLiquidity(otherHalf,newBalanceFromLiquify) (#915)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
- swapTokensForBNB(Portion) (#922)
- pcsV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#940-946)
External calls sending eth:
- addLiquidity(otherHalf,newBalanceFromLiquify) (#915)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
State variables written after the call(s):
- swapTokensForBNB(Portion) (#922)
- _allowances[owner][spender] = amount (#717)
Reentrancy in BackDrops.transferFrom(address,address,uint256) (#663-678):
External calls:
- _transfer(sender,recipient,amount) (#668)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
- pcsV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#940-946)
External calls sending eth:
- _transfer(sender,recipient,amount) (#668)
- recipient.transfer(amount) (#963)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
State variables written after the call(s):
- _approve(sender,_msgSender(),_allowances[sender][_msgSender()].sub(amount,ERC20: transfer amount exceeds allowance)) (#669-676)
- _allowances[owner][spender] = amount (#717)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in BackDrops._transfer(address,address,uint256) (#744-797):
External calls:
- swapAndLiquify(tokensToSwap) (#777)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
- pcsV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#940-946)
External calls sending eth:
- swapAndLiquify(tokensToSwap) (#777)
- recipient.transfer(amount) (#963)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
Event emitted after the call(s):
- Transfer(sender,recipient,tTransferAmount) (#805)
- _transferStandard(sender,recipient,amount) (#792)
Reentrancy in BackDrops.constructor() (#562-576):
External calls:
- pcsV2Pair = IPancakeFactory(_pancakeswapV2Router.factory()).createPair(address(this),_pancakeswapV2Router.WETH()) (#569-572)
Event emitted after the call(s):
- Transfer(address(0),_msgSender(),_tTotal) (#575)
Reentrancy in BackDrops.swapAndLiquify(uint256) (#901-931):
External calls:
- swapTokensForBNB(half) (#911)
- pcsV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#940-946)
- addLiquidity(otherHalf,newBalanceFromLiquify) (#915)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
External calls sending eth:
- addLiquidity(otherHalf,newBalanceFromLiquify) (#915)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#718)
- addLiquidity(otherHalf,newBalanceFromLiquify) (#915)
- LiquiditySwapped(half,newBalanceFromLiquify,otherHalf) (#917)
Reentrancy in BackDrops.swapAndLiquify(uint256) (#901-931):
External calls:
- swapTokensForBNB(half) (#911)
- pcsV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#940-946)
- addLiquidity(otherHalf,newBalanceFromLiquify) (#915)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
- swapTokensForBNB(Portion) (#922)
- pcsV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#940-946)
External calls sending eth:
- addLiquidity(otherHalf,newBalanceFromLiquify) (#915)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#718)
- swapTokensForBNB(Portion) (#922)
Reentrancy in BackDrops.swapAndLiquify(uint256) (#901-931):
External calls:
- swapTokensForBNB(half) (#911)
- pcsV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#940-946)
- addLiquidity(otherHalf,newBalanceFromLiquify) (#915)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
- swapTokensForBNB(Portion) (#922)
- pcsV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#940-946)
External calls sending eth:
- addLiquidity(otherHalf,newBalanceFromLiquify) (#915)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
- TransferETH(address(buybackswap),address(this).balance) (#928)
- recipient.transfer(amount) (#963)
Event emitted after the call(s):
- TokensSwapped(Portion,BalanceReceived,totalBalanceToSend,buybackswap) (#930)
Reentrancy in BackDrops.transferFrom(address,address,uint256) (#663-678):
External calls:
- _transfer(sender,recipient,amount) (#668)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
- pcsV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#940-946)
External calls sending eth:
- _transfer(sender,recipient,amount) (#668)
- recipient.transfer(amount) (#963)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#718)
- _approve(sender,_msgSender(),_allowances[sender][_msgSender()].sub(amount,ERC20: transfer amount exceeds allowance)) (#669-676)
Apply the check-effects-interactions pattern.

Additional information: link

BackDrops._getAntiDumpMultiplier() (#819-835) uses timestamp for comparisons
Dangerous comparisons:
- time_since_start < 1 * hour (#823)
- time_since_start < 2 * hour (#825)
- time_since_start < 3 * hour (#827)
Avoid relying on block.timestamp.

Additional information: link

Different versions of Solidity is used:
- Version used: ['>=0.5.0', '>=0.6.2', '^0.6.12']
- ^0.6.12 (#1)
- >=0.6.2 (#162)
- >=0.6.2 (#323)
- >=0.5.0 (#372)
- >=0.5.0 (#406)
Use one Solidity version.

Additional information: link

Context._msgData() (#50-53) is never used and should be removed
SafeMath.mod(uint256,uint256) (#106-108) is never used and should be removed
SafeMath.mod(uint256,uint256,string) (#110-117) is never used and should be removed
Remove unused functions.

Additional information: link

BackDrops._previousTaxFee (#538) is set pre-construction with a non-constant function or state variable:
- _taxFee
BackDrops._previousLiquidityFee (#539) 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

Pragma version>=0.6.2 (#162) allows old versions
Pragma version>=0.6.2 (#323) allows old versions
Pragma version>=0.5.0 (#372) allows old versions
Pragma version>=0.5.0 (#406) allows old versions
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

Function IPancakeRouter01.WETH() (#167) is not in mixedCase
Function IPancakeFactory.INIT_CODE_PAIR_HASH() (#403) is not in mixedCase
Function IPancakePair.DOMAIN_SEPARATOR() (#441) is not in mixedCase
Function IPancakePair.PERMIT_TYPEHASH() (#443) is not in mixedCase
Function IPancakePair.MINIMUM_LIQUIDITY() (#474) is not in mixedCase
Function BackDrops.TransferETH(address,uint256) (#962-964) is not in mixedCase
Constant BackDrops._tTotal (#531) is not in UPPER_CASE_WITH_UNDERSCORES
Variable BackDrops._taxFee (#536) is not in mixedCase
Variable BackDrops._liquidityFee (#537) is not in mixedCase
Variable BackDrops._previousTaxFee (#538) is not in mixedCase
Variable BackDrops._previousLiquidityFee (#539) is not in mixedCase
Variable BackDrops._start_timestamp (#547) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Redundant expression "this (#51)" inContext (#43-54)
Remove redundant statements if they congest code but offer no value.

Additional information: link

Reentrancy in BackDrops._transfer(address,address,uint256) (#744-797):
External calls:
- swapAndLiquify(tokensToSwap) (#777)
- recipient.transfer(amount) (#963)
External calls sending eth:
- swapAndLiquify(tokensToSwap) (#777)
- recipient.transfer(amount) (#963)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
State variables written after the call(s):
- removeAllFee() (#790)
- _liquidityFee = 0 (#728)
- restoreAllFee() (#794)
- _liquidityFee = _previousLiquidityFee (#741)
- turnOffPenalties() (#796)
- _penaltiesEnabled = false (#732)
- removeAllFee() (#790)
- _previousLiquidityFee = _liquidityFee (#725)
- removeAllFee() (#790)
- _previousTaxFee = _taxFee (#724)
- _transferStandard(sender,recipient,amount) (#792)
- _rOwned[address(this)] = _rOwned[address(this)].add(rLiquidity) (#898)
- _rOwned[sender] = _rOwned[sender].sub(rAmount) (#801)
- _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount) (#802)
- _transferStandard(sender,recipient,amount) (#792)
- _rTotal = _rTotal.sub(rFee) (#809)
- _transferStandard(sender,recipient,amount) (#792)
- _tFeeTotal = _tFeeTotal.add(tFee) (#810)
- removeAllFee() (#790)
- _taxFee = 0 (#727)
- restoreAllFee() (#794)
- _taxFee = _previousTaxFee (#740)
Event emitted after the call(s):
- Transfer(sender,recipient,tTransferAmount) (#805)
- _transferStandard(sender,recipient,amount) (#792)
Reentrancy in BackDrops.swapAndLiquify(uint256) (#901-931):
External calls:
- TransferETH(address(buybackswap),address(this).balance) (#928)
- recipient.transfer(amount) (#963)
External calls sending eth:
- addLiquidity(otherHalf,newBalanceFromLiquify) (#915)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
- TransferETH(address(buybackswap),address(this).balance) (#928)
- recipient.transfer(amount) (#963)
Event emitted after the call(s):
- TokensSwapped(Portion,BalanceReceived,totalBalanceToSend,buybackswap) (#930)
Reentrancy in BackDrops.transferFrom(address,address,uint256) (#663-678):
External calls:
- _transfer(sender,recipient,amount) (#668)
- recipient.transfer(amount) (#963)
External calls sending eth:
- _transfer(sender,recipient,amount) (#668)
- recipient.transfer(amount) (#963)
- pcsV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#952-959)
State variables written after the call(s):
- _approve(sender,_msgSender(),_allowances[sender][_msgSender()].sub(amount,ERC20: transfer amount exceeds allowance)) (#669-676)
- _allowances[owner][spender] = amount (#717)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#718)
- _approve(sender,_msgSender(),_allowances[sender][_msgSender()].sub(amount,ERC20: transfer amount exceeds allowance)) (#669-676)
Apply the check-effects-interactions pattern.

Additional information: link

Variable IPancakeRouter01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#172) is too similar to IPancakeRouter01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#173)
Variable BackDrops._transferStandard(address,address,uint256).rTransferAmount (#800) is too similar to BackDrops._transferStandard(address,address,uint256).tTransferAmount (#800)
Variable BackDrops._getValues(uint256).rTransferAmount (#815) is too similar to BackDrops._transferStandard(address,address,uint256).tTransferAmount (#800)
Variable BackDrops._transferStandard(address,address,uint256).rTransferAmount (#800) is too similar to BackDrops._getTValues(uint256).tTransferAmount (#850)
Variable BackDrops._getRValues(uint256,uint256,uint256,uint256).rTransferAmount (#871) is too similar to BackDrops._getValues(uint256).tTransferAmount (#814)
Variable BackDrops._getRValues(uint256,uint256,uint256,uint256).rTransferAmount (#871) is too similar to BackDrops._getTValues(uint256).tTransferAmount (#850)
Variable BackDrops._getValues(uint256).rTransferAmount (#815) is too similar to BackDrops._getTValues(uint256).tTransferAmount (#850)
Variable BackDrops._getValues(uint256).rTransferAmount (#815) is too similar to BackDrops._getValues(uint256).tTransferAmount (#814)
Variable BackDrops._getRValues(uint256,uint256,uint256,uint256).rTransferAmount (#871) is too similar to BackDrops._transferStandard(address,address,uint256).tTransferAmount (#800)
Variable BackDrops._transferStandard(address,address,uint256).rTransferAmount (#800) is too similar to BackDrops._getValues(uint256).tTransferAmount (#814)
Prevent variables from having similar names.

Additional information: link

BackDrops.slitherConstructorVariables() (#517-968) uses literals with too many digits:
- _numOfTokensToExchange = 10000000 * 10 ** 6 * 10 ** 9 (#534)
BackDrops.slitherConstructorConstantVariables() (#517-968) uses literals with too many digits:
- _tTotal = 1000000000 * 10 ** 6 * 10 ** 9 (#531)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

BackDrops._decimals (#546) should be constant
BackDrops._maxWallet (#535) should be constant
BackDrops._name (#544) should be constant
BackDrops._numOfTokensToExchange (#534) should be constant
BackDrops._symbol (#545) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

renounceOwnership() should be declared external:
- Ownable.renounceOwnership() (#143-146)
transferOwnership(address) should be declared external:
- Ownable.transferOwnership(address) (#148-150)
name() should be declared external:
- BackDrops.name() (#584-586)
symbol() should be declared external:
- BackDrops.symbol() (#588-590)
decimals() should be declared external:
- BackDrops.decimals() (#592-594)
getEquivalentValue() should be declared external:
- BackDrops.getEquivalentValue() (#596-614)
getPairReserves() should be declared external:
- BackDrops.getPairReserves() (#617-622)
totalSupply() should be declared external:
- BackDrops.totalSupply() (#624-626)
isExcluded(address) should be declared external:
- BackDrops.isExcluded(address) (#632-634)
transfer(address,uint256) should be declared external:
- BackDrops.transfer(address,uint256) (#636-643)
allowance(address,address) should be declared external:
- BackDrops.allowance(address,address) (#645-652)
approve(address,uint256) should be declared external:
- BackDrops.approve(address,uint256) (#654-661)
transferFrom(address,address,uint256) should be declared external:
- BackDrops.transferFrom(address,address,uint256) (#663-678)
totalFees() should be declared external:
- BackDrops.totalFees() (#680-682)
inSwapAndLiquify() should be declared external:
- BackDrops.inSwapAndLiquify() (#684-686)
reflect(uint256) should be declared external:
- BackDrops.reflect(uint256) (#688-694)
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 low.


Unable to find Telegram and Twitter accounts

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Unable to find website, listings and other project-related information


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


Token has no active CoinGecko listing / rank


Token has no active CoinMarketCap listing / rank

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