L2E [Label2Earn] Token

Label2Earn.transferForeignToken(address) (#524-542) ignores return value by IBEP20(_token).transfer(marketingFeeReceiver,_contractBalance) (#534)
Use SafeERC20, or ensure that the transfer/transferFrom return value is checked.

Additional information: link

Reentrancy in Label2Earn._transferFrom(address,address,uint256) (#259-297):
External calls:
- swapBack() (#272)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToLiquifySwap,0,pathLiq,address(this),block.timestamp) (#421-428)
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#432-442)
- router.swapExactTokensForTokensSupportingFeeOnTransferTokens(amountToMarketing,0,path,marketingFeeReceiver,block.timestamp) (#453-459)
External calls sending eth:
- swapBack() (#272)
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#432-442)
State variables written after the call(s):
- _balances[sender] = _balances[sender].sub(amount,Insufficient Balance) (#274)
- _balances[recipient] = _balances[recipient].add(amountReceived) (#276)
- amountReceived = takeFee(sender,recipient,amount) (#275)
- _balances[DEAD] = _balances[DEAD].add(burnAmount) (#318)
- _balances[address(this)] = _balances[address(this)].add(newFeeAmount) (#326)
- _balances[DEAD] = _balances[DEAD].add(burnAmount_scope_1) (#340)
- _balances[address(this)] = _balances[address(this)].add(newFeeAmount_scope_2) (#354)
- _balances[address(this)] = _balances[address(this)].add(feeAmount_scope_3) (#364)
- buyersToken[updatedTime][recipient] = newTotalTokenUser (#292)
- amountReceived = takeFee(sender,recipient,amount) (#275)
- competitionAmount = competitionAmount + (rewardFeeAmount) (#347)
- currentWinner = recipient (#289)
- currentWinnerBNB = newTotalBuyUser (#287)
- amountReceived = takeFee(sender,recipient,amount) (#275)
- liqamount = liqamount + (amount.mul(liquidityFeeSell).div(1000)) (#325)
- liqamount = liqamount + (amount.mul(liquidityFeeBuy).div(1000)) (#353)
Reentrancy in Label2Earn.addLiqManual() (#580-609):
External calls:
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToLiquifySwap,0,pathLiq,address(this),block.timestamp) (#590-596)
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#599-606)
External calls sending eth:
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#599-606)
State variables written after the call(s):
- liqamount = 0 (#607)
Reentrancy in Label2Earn.manualSwapback() (#611-666):
External calls:
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToLiquifySwap,0,pathLiq,address(this),block.timestamp) (#626-633)
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#637-647)
External calls sending eth:
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#637-647)
State variables written after the call(s):
- liqamount = 0 (#645)
Reentrancy in Label2Earn.swapBack() (#406-461):
External calls:
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToLiquifySwap,0,pathLiq,address(this),block.timestamp) (#421-428)
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#432-442)
External calls sending eth:
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#432-442)
State variables written after the call(s):
- liqamount = 0 (#440)
Apply the check-effects-interactions pattern.

Additional information: link

Label2Earn._transferFrom(address,address,uint256) (#259-297) uses a dangerous strict equality:
- competitionLastRewarded == 0 && (sender == pair || recipient == pair) (#265)
Don't use strict equality to determine if an account has enough Ether or tokens.

Additional information: link

Unable to verify that contract auditor is trusted: Certik, Quantstamp, Hacken, Solidity, Paladinsec, Openzeppelin, Verichains

Contract ownership is not renounced (belongs to a wallet)

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.

Label2Earn.swapBack() (#406-461) ignores return value by router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#432-442)
Label2Earn.addLiqManual() (#580-609) ignores return value by router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#599-606)
Label2Earn.manualSwapback() (#611-666) ignores return value by router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#637-647)
Ensure that all the return values of the function calls are used.

Additional information: link

Label2Earn.setCompetitionTimePeriod(uint256) (#509-512) should emit an event for:
- competitionRewardTimePeriod = _second (#511)
Emit an event for critical parameter changes.

Additional information: link

Label2Earn.setMarketingReward(address)._reward (#504) lacks a zero-check on :
- REWARD = address(_reward) (#505)
Check that the address is not zero.

Additional information: link

Label2Earn.swapBack() (#406-461) has external calls inside a loop: router.swapExactTokensForTokensSupportingFeeOnTransferTokens(amountToMarketing,0,path,marketingFeeReceiver,block.timestamp) (#453-459)
Label2Earn.swapBack() (#406-461) has external calls inside a loop: router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToLiquifySwap,0,pathLiq,address(this),block.timestamp) (#421-428)
Label2Earn.swapBack() (#406-461) has external calls inside a loop: router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#432-442)
Label2Earn._transferFrom(address,address,uint256) (#259-297) has external calls inside a loop: boughtAmount = router.getAmountsIn(amount,path) (#283)
Favor pull over push strategy for external calls.

Additional information: link

Reentrancy in Label2Earn._transferFrom(address,address,uint256) (#259-297):
External calls:
- swapBack() (#272)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToLiquifySwap,0,pathLiq,address(this),block.timestamp) (#421-428)
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#432-442)
- router.swapExactTokensForTokensSupportingFeeOnTransferTokens(amountToMarketing,0,path,marketingFeeReceiver,block.timestamp) (#453-459)
External calls sending eth:
- swapBack() (#272)
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#432-442)
State variables written after the call(s):
- buyers[updatedTime][recipient] = newTotalBuyUser (#291)
- currentWinnerToken = newTotalTokenUser (#288)
Reentrancy in Label2Earn.constructor() (#214-226):
External calls:
- pair = IDEXFactory(router.factory()).createPair(WBNB,address(this)) (#217)
State variables written after the call(s):
- _allowances[address(this)][address(router)] = type()(uint256).max (#218)
- _balances[_owner] = _totalSupply (#224)
- isFeeExempt[_owner] = true (#220)
- isFeeExempt[address(this)] = true (#221)
- isLimitExempt[_owner] = true (#222)
- isLimitExempt[address(this)] = true (#223)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in Label2Earn._transferFrom(address,address,uint256) (#259-297):
External calls:
- swapBack() (#272)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToLiquifySwap,0,pathLiq,address(this),block.timestamp) (#421-428)
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#432-442)
- router.swapExactTokensForTokensSupportingFeeOnTransferTokens(amountToMarketing,0,path,marketingFeeReceiver,block.timestamp) (#453-459)
External calls sending eth:
- swapBack() (#272)
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#432-442)
Event emitted after the call(s):
- Transfer(sender,DEAD,burnAmount) (#319)
- amountReceived = takeFee(sender,recipient,amount) (#275)
- Transfer(sender,address(this),newFeeAmount) (#327)
- amountReceived = takeFee(sender,recipient,amount) (#275)
- Transfer(sender,DEAD,burnAmount_scope_1) (#341)
- amountReceived = takeFee(sender,recipient,amount) (#275)
- Transfer(sender,recipient,amountReceived) (#295)
- Transfer(sender,address(this),newFeeAmount_scope_2) (#355)
- amountReceived = takeFee(sender,recipient,amount) (#275)
- Transfer(sender,address(this),feeAmount_scope_3) (#365)
- amountReceived = takeFee(sender,recipient,amount) (#275)
Reentrancy in Label2Earn.addLiqManual() (#580-609):
External calls:
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToLiquifySwap,0,pathLiq,address(this),block.timestamp) (#590-596)
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#599-606)
External calls sending eth:
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#599-606)
Event emitted after the call(s):
- AutoLiquify(amountBNB,amountToLiquifyToken) (#608)
Reentrancy in Label2Earn.constructor() (#214-226):
External calls:
- pair = IDEXFactory(router.factory()).createPair(WBNB,address(this)) (#217)
Event emitted after the call(s):
- Transfer(address(0),_owner,_totalSupply) (#225)
Reentrancy in Label2Earn.manualSwapback() (#611-666):
External calls:
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToLiquifySwap,0,pathLiq,address(this),block.timestamp) (#626-633)
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#637-647)
External calls sending eth:
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#637-647)
Event emitted after the call(s):
- AutoLiquify(amountBNB,amountToLiquifyToken) (#646)
Reentrancy in Label2Earn.swapBack() (#406-461):
External calls:
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(amountToLiquifySwap,0,pathLiq,address(this),block.timestamp) (#421-428)
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#432-442)
External calls sending eth:
- router.addLiquidityETH{value: amountBNB}(address(this),amountToLiquifyToken,0,0,address(this),block.timestamp) (#432-442)
Event emitted after the call(s):
- AutoLiquify(amountBNB,amountToLiquifyToken) (#441)
Apply the check-effects-interactions pattern.

Additional information: link

Label2Earn._transferFrom(address,address,uint256) (#259-297) uses timestamp for comparisons
Dangerous comparisons:
- competitionLastRewarded == 0 && (sender == pair || recipient == pair) (#265)
Label2Earn.shouldSendReward() (#379-384) uses timestamp for comparisons
Dangerous comparisons:
- competitionLastRewarded < block.timestamp && competitionRewardPercent != 0 && competitionLastRewarded != 0 && competitionAmount > 0 (#380-383)
Label2Earn.updateTime() (#567-578) uses timestamp for comparisons
Dangerous comparisons:
- dif > competitionRewardTimePeriod (#570)
Avoid relying on block.timestamp.

Additional information: link

Label2Earn._transferFrom(address,address,uint256) (#259-297) has costly operations inside a loop:
- competitionLastRewarded = block.timestamp.add(competitionRewardTimePeriod) (#266)
Label2Earn.swapping() (#212) has costly operations inside a loop:
- inSwap = true (#212)
Label2Earn.swapping() (#212) has costly operations inside a loop:
- inSwap = false (#212)
Label2Earn.swapBack() (#406-461) has costly operations inside a loop:
- liqamount = 0 (#440)
Label2Earn.takeFee(address,address,uint256) (#310-370) has costly operations inside a loop:
- liqamount = liqamount + (amount.mul(liquidityFeeSell).div(1000)) (#325)
Label2Earn.takeFee(address,address,uint256) (#310-370) has costly operations inside a loop:
- competitionAmount = competitionAmount + (rewardFeeAmount) (#347)
Label2Earn.takeFee(address,address,uint256) (#310-370) has costly operations inside a loop:
- liqamount = liqamount + (amount.mul(liquidityFeeBuy).div(1000)) (#353)
Label2Earn._transferFrom(address,address,uint256) (#259-297) has costly operations inside a loop:
- currentWinnerBNB = newTotalBuyUser (#287)
Label2Earn._transferFrom(address,address,uint256) (#259-297) has costly operations inside a loop:
- currentWinnerToken = newTotalTokenUser (#288)
Label2Earn._transferFrom(address,address,uint256) (#259-297) has costly operations inside a loop:
- currentWinner = recipient (#289)
Label2Earn.sendReward() (#386-404) has costly operations inside a loop:
- currentWinner = address(this) (#388)
Label2Earn.sendReward() (#386-404) has costly operations inside a loop:
- lastWinnerReward = competitionAmount (#393)
Label2Earn.updateTime() (#567-578) has costly operations inside a loop:
- competitionLastRewarded = competitionLastRewarded + (competitionRewardTimePeriod * (roundDelay + 1)) (#572)
Label2Earn.updateTime() (#567-578) has costly operations inside a loop:
- competitionLastRewarded = competitionLastRewarded + competitionRewardTimePeriod (#575)
Label2Earn.sendReward() (#386-404) has costly operations inside a loop:
- lastWinner = currentWinner (#395)
Label2Earn.sendReward() (#386-404) has costly operations inside a loop:
- lastWinnerBNB = currentWinnerBNB (#396)
Label2Earn.sendReward() (#386-404) has costly operations inside a loop:
- currentWinner = DEAD (#397)
Label2Earn.sendReward() (#386-404) has costly operations inside a loop:
- currentWinnerBNB = 0 (#398)
Label2Earn.sendReward() (#386-404) has costly operations inside a loop:
- currentWinnerToken = 0 (#399)
Label2Earn.sendReward() (#386-404) has costly operations inside a loop:
- competitionAmount = 0 (#400)
Use a local variable to hold the loop computation result.

Additional information: link

Function IDEXRouter.WETH() (#104) is not in mixedCase
Event Label2EarnswapThresholdChanged(uint256,bool) (#670) is not in CapWords
Event Label2EarnfeeChanged(uint256,uint256,uint256,uint256,uint256,uint256,uint256,uint256) (#671) is not in CapWords
Parameter Label2Earn.setFees(uint256,uint256,uint256,uint256,uint256,uint256,uint256,uint256)._liquidityFeeSell (#484) is not in mixedCase
Parameter Label2Earn.setFees(uint256,uint256,uint256,uint256,uint256,uint256,uint256,uint256)._marketingFeeSell (#484) is not in mixedCase
Parameter Label2Earn.setFees(uint256,uint256,uint256,uint256,uint256,uint256,uint256,uint256)._burnFeeSell (#484) is not in mixedCase
Parameter Label2Earn.setFees(uint256,uint256,uint256,uint256,uint256,uint256,uint256,uint256)._transferFee (#484) is not in mixedCase
Parameter Label2Earn.setFees(uint256,uint256,uint256,uint256,uint256,uint256,uint256,uint256)._liquidityFeeBuy (#484) is not in mixedCase
Parameter Label2Earn.setFees(uint256,uint256,uint256,uint256,uint256,uint256,uint256,uint256)._marketingFeeBuy (#484) is not in mixedCase
Parameter Label2Earn.setFees(uint256,uint256,uint256,uint256,uint256,uint256,uint256,uint256)._burnFeeBuy (#484) is not in mixedCase
Parameter Label2Earn.setFees(uint256,uint256,uint256,uint256,uint256,uint256,uint256,uint256)._competitionFee (#484) is not in mixedCase
Parameter Label2Earn.setMarketingReward(address)._reward (#504) is not in mixedCase
Parameter Label2Earn.setCompetitionTimePeriod(uint256)._second (#509) is not in mixedCase
Parameter Label2Earn.setSwapBackSettings(bool,uint256)._enabled (#514) is not in mixedCase
Parameter Label2Earn.setSwapBackSettings(bool,uint256)._amount (#514) is not in mixedCase
Parameter Label2Earn.transferForeignToken(address)._token (#524) is not in mixedCase
Parameter Label2Earn.multiSend(address[],uint256[])._to (#552) is not in mixedCase
Parameter Label2Earn.multiSend(address[],uint256[])._value (#552) is not in mixedCase
Variable Label2Earn.REWARD (#156) is not in mixedCase
Variable Label2Earn.PANCAKE_ROUTER (#157) is not in mixedCase
Constant Label2Earn._name (#159) is not in UPPER_CASE_WITH_UNDERSCORES
Constant Label2Earn._symbol (#160) is not in UPPER_CASE_WITH_UNDERSCORES
Constant Label2Earn._decimals (#161) is not in UPPER_CASE_WITH_UNDERSCORES
Constant Label2Earn._totalSupply (#162) is not in UPPER_CASE_WITH_UNDERSCORES
Variable Label2Earn._maxWalletSize (#164) is not in mixedCase
Variable Label2Earn._balances (#165) is not in mixedCase
Variable Label2Earn._allowances (#166) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Variable IDEXRouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#109) is too similar to IDEXRouter.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#110)
Variable Label2Earn.takeFee(address,address,uint256).feeAmount_scope_0 (#335) is too similar to Label2Earn.takeFee(address,address,uint256).feeAmount_scope_3 (#363)
Prevent variables from having similar names.

Additional information: link

Label2Earn.slitherConstructorConstantVariables() (#152-673) uses literals with too many digits:
- DEAD = 0x000000000000000000000000000000000000dEaD (#155)
Label2Earn.slitherConstructorConstantVariables() (#152-673) uses literals with too many digits:
- _totalSupply = 256000000 * (10 ** _decimals) (#162)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

Label2Earn.PANCAKE_ROUTER (#157) should be constant
Label2Earn.marketingFeeReceiver (#184) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

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. Ignore for presale.

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

Additional information: link

Unable to find token on CoinGecko

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Unable to find token on CoinMarketCap

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Token is not listed at Mobula.Finance

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Unable to find token on CoinHunt

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Token has no active CoinGecko listing / rank

Token has no active CoinMarketCap listing / rank

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