METARWRD [Meta Rewards] Token

Reentrancy in MetaRewards._transfer(address,address,uint256) (#487-513):
External calls:
- handle_fees() (#503)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#550-557)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#541)
External calls sending eth:
- handle_fees() (#503)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#550-557)
State variables written after the call(s):
- super._transfer(sender,recipient,amount - fee) (#506)
- _balances[sender] = senderBalance - amount (#294)
- _balances[recipient] += amount (#295)
- super._transfer(sender,address(this),fee) (#510)
- _balances[sender] = senderBalance - amount (#294)
- _balances[recipient] += amount (#295)
Apply the check-effects-interactions pattern.

Additional information: link

Token is flagged by TokenSniffer due to presence of exploit in contract code

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

Contract ownership is not renounced (belongs to a wallet)

MetaRewards.changeFees(uint16,uint16) (#572-575) should emit an event for:
- feeliq_buy = _feeliq_buy (#573)
- feeliq_sell = _feeliq_sell (#574)
Emit an event for critical parameter changes.

Additional information: link

Modifier MetaRewards.mutexLock() (#463-469) does not always execute _; or revert
All the paths in a modifier must execute _ or revert.

Additional information: link

Reentrancy in MetaRewards.constructor() (#471-484):
External calls:
- _pair = IFactory(_router.factory()).createPair(address(this),_router.WETH()) (#477-478)
State variables written after the call(s):
- exemptFee[address(this)] = true (#483)
- pair = _pair (#481)
- router = _router (#480)
Reentrancy in MetaRewards.handle_fees() (#515-529):
External calls:
- swapTokensForBNB(exchange) (#524)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#541)
- addLiquidity(exchangeOtherHalf,bnbBalance) (#527)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#550-557)
External calls sending eth:
- addLiquidity(exchangeOtherHalf,bnbBalance) (#527)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#550-557)
State variables written after the call(s):
- addLiquidity(exchangeOtherHalf,bnbBalance) (#527)
- _allowances[owner][spender] = amount (#360)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in MetaRewards._transfer(address,address,uint256) (#487-513):
External calls:
- handle_fees() (#503)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#550-557)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#541)
External calls sending eth:
- handle_fees() (#503)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#550-557)
Event emitted after the call(s):
- Transfer(sender,recipient,amount) (#297)
- super._transfer(sender,recipient,amount - fee) (#506)
- Transfer(sender,recipient,amount) (#297)
- super._transfer(sender,address(this),fee) (#510)
Reentrancy in MetaRewards.handle_fees() (#515-529):
External calls:
- swapTokensForBNB(exchange) (#524)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#541)
- addLiquidity(exchangeOtherHalf,bnbBalance) (#527)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#550-557)
External calls sending eth:
- addLiquidity(exchangeOtherHalf,bnbBalance) (#527)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#550-557)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#361)
- addLiquidity(exchangeOtherHalf,bnbBalance) (#527)
Apply the check-effects-interactions pattern.

Additional information: link

Address.isContract(address) (#34-43) uses assembly
- INLINE ASM (#41)
Address._functionCallWithValue(address,bytes,uint256,string) (#71-88) uses assembly
- INLINE ASM (#80-83)
Do not use evm assembly.

Additional information: link

Low level call in Address.sendValue(address,uint256) (#45-51):
- (success) = recipient.call{value: amount}() (#49)
Low level call in Address._functionCallWithValue(address,bytes,uint256,string) (#71-88):
- (success,returndata) = target.call{value: weiValue}(data) (#74)
Avoid low-level calls. Check the call success. If the call is meant for a contract, check for code existence

Additional information: link

Redundant expression "this (#11)" inContext (#5-14)
Remove redundant statements if they congest code but offer no value.

Additional information: link

name() should be declared external:
- ERC20.name() (#135-137)
symbol() should be declared external:
- ERC20.symbol() (#143-145)
totalSupply() should be declared external:
- ERC20.totalSupply() (#167-169)
transfer(address,uint256) should be declared external:
- ERC20.transfer(address,uint256) (#186-189)
allowance(address,address) should be declared external:
- ERC20.allowance(address,address) (#194-196)
approve(address,uint256) should be declared external:
- ERC20.approve(address,uint256) (#205-208)
transferFrom(address,address,uint256) should be declared external:
- ERC20.transferFrom(address,address,uint256) (#223-231)
increaseAllowance(address,uint256) should be declared external:
- ERC20.increaseAllowance(address,uint256) (#245-248)
decreaseAllowance(address,uint256) should be declared external:
- ERC20.decreaseAllowance(address,uint256) (#264-270)
owner() should be declared external:
- Ownable.owner() (#393-395)
renounceOwnership() should be declared external:
- Ownable.renounceOwnership() (#402-405)
transferOwnership(address) should be declared external:
- Ownable.transferOwnership(address) (#407-411)
Use the external attribute for functions never called from the contract.

Additional information: link

Address._functionCallWithValue(address,bytes,uint256,string) (#71-88) is never used and should be removed
Address.functionCall(address,bytes) (#54-56) is never used and should be removed
Address.functionCall(address,bytes,string) (#58-60) is never used and should be removed
Address.functionCallWithValue(address,bytes,uint256) (#62-64) is never used and should be removed
Address.functionCallWithValue(address,bytes,uint256,string) (#66-69) is never used and should be removed
Address.isContract(address) (#34-43) is never used and should be removed
Address.sendValue(address,uint256) (#45-51) is never used and should be removed
Context._msgData() (#10-13) is never used and should be removed
ERC20._burn(address,uint256) (#330-341) is never used and should be removed
Remove unused functions.

Additional information: link

MetaRewards.addLiquidity(uint256,uint256) (#545-558) ignores return value by router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#550-557)
Ensure that all the return values of the function calls are used.

Additional information: link

Function IRouter.WETH() (#421) is not in mixedCase
Function MetaRewards.handle_fees() (#515-529) is not in mixedCase
Parameter MetaRewards.changeLiquidityTreshhold(uint256).new_amount (#566) is not in mixedCase
Parameter MetaRewards.changeFees(uint16,uint16)._feeliq_buy (#572) is not in mixedCase
Parameter MetaRewards.changeFees(uint16,uint16)._feeliq_sell (#572) is not in mixedCase
Parameter MetaRewards.updateExemptFee(address,bool)._address (#578) is not in mixedCase
Variable MetaRewards._tokenLiquidityThreshold (#448) is not in mixedCase
Variable MetaRewards.ProvidingLiquidity (#449) is not in mixedCase
Variable MetaRewards.feeliq_buy (#452) is not in mixedCase
Variable MetaRewards.feeliq_sell (#453) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Contract has 23% buy tax and 0% sell tax.
Taxes are suspiciously high (over 10%) and contract ownership is not renounced. Token has a high risk of becoming a honeypot.

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.

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

Token is deployed only at one blockchain

Token has only one trading pair

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

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

Additional information: link

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

Token has no active CoinGecko listing / rank

Token has no active CoinMarketCap listing / rank