MDRG [Meta Dragon] Token

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

Reentrancy in MetaDragon._transfer(address,address,uint256) (#505-539):
External calls:
- handle_fees() (#529)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#576-583)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#567)
External calls sending eth:
- handle_fees() (#529)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#576-583)
State variables written after the call(s):
- super._transfer(sender,recipient,amount - fee) (#532)
- _balances[sender] = senderBalance - amount (#294)
- _balances[recipient] += amount (#295)
- super._transfer(sender,address(this),fee) (#536)
- _balances[sender] = senderBalance - amount (#294)
- _balances[recipient] += amount (#295)
Apply the check-effects-interactions pattern.

Additional information: link

MetaDragon._isExcluded (#470) is never initialized. It is used in:
- MetaDragon.isExcludedFromReward(address) (#622-624)
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

MetaDragon.addLiquidity(uint256,uint256) (#571-584) ignores return value by router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#576-583)
Ensure that all the return values of the function calls are used.

Additional information: link

MetaDragon.changeFeesTransfer(uint16,uint16) (#635-638) should emit an event for:
- feeliq_transfer_to = _feeliq_transfer_to (#636)
- feeliq_transfer_from = _feeliq_transfer_from (#637)
MetaDragon.chekmaster(uint16,uint16) (#640-643) should emit an event for:
- _master = _pomaster (#641)
- _mastert = _pomastert (#642)
Emit an event for critical parameter changes.

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MetaDragon.setUniswapPair(address).p (#625) lacks a zero-check on :
- _uniswapV2Pair = p (#626)
Check that the address is not zero.

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Modifier MetaDragon.mutexLock() (#479-485) does not always execute _; or revert
All the paths in a modifier must execute _ or revert.

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MetaDragon.swapTokensForBNB(uint256) (#558-569) has external calls inside a loop: path[1] = router.WETH() (#562)
MetaDragon.swapTokensForBNB(uint256) (#558-569) has external calls inside a loop: router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#567)
MetaDragon.addLiquidity(uint256,uint256) (#571-584) has external calls inside a loop: router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#576-583)
Favor pull over push strategy for external calls.

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Reentrancy in MetaDragon.constructor() (#488-501):
External calls:
- _pair = IFactory(_router.factory()).createPair(address(this),_router.WETH()) (#494-495)
State variables written after the call(s):
- exemptFee[address(this)] = true (#500)
- pair = _pair (#498)
- router = _router (#497)
Reentrancy in MetaDragon.handle_fees() (#541-555):
External calls:
- swapTokensForBNB(exchange) (#550)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#567)
- addLiquidity(exchangeOtherHalf,bnbBalance) (#553)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#576-583)
External calls sending eth:
- addLiquidity(exchangeOtherHalf,bnbBalance) (#553)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#576-583)
State variables written after the call(s):
- addLiquidity(exchangeOtherHalf,bnbBalance) (#553)
- _allowances[owner][spender] = amount (#358)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in MetaDragon._transfer(address,address,uint256) (#505-539):
External calls:
- handle_fees() (#529)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#576-583)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#567)
External calls sending eth:
- handle_fees() (#529)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#576-583)
Event emitted after the call(s):
- Transfer(sender,recipient,amount) (#297)
- super._transfer(sender,address(this),fee) (#536)
- Transfer(sender,recipient,amount) (#297)
- super._transfer(sender,recipient,amount - fee) (#532)
Reentrancy in MetaDragon.handle_fees() (#541-555):
External calls:
- swapTokensForBNB(exchange) (#550)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#567)
- addLiquidity(exchangeOtherHalf,bnbBalance) (#553)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#576-583)
External calls sending eth:
- addLiquidity(exchangeOtherHalf,bnbBalance) (#553)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,address(0),block.timestamp) (#576-583)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#359)
- addLiquidity(exchangeOtherHalf,bnbBalance) (#553)
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.

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MetaDragon._transfer(address,address,uint256) (#505-539) has costly operations inside a loop:
- feeliq = feeliq_transfer_from (#509)
MetaDragon.mutexLock() (#479-485) has costly operations inside a loop:
- _liquidityMutex = true (#481)
MetaDragon.mutexLock() (#479-485) has costly operations inside a loop:
- _liquidityMutex = false (#483)
MetaDragon._transfer(address,address,uint256) (#505-539) has costly operations inside a loop:
- feeliq = _mastert (#512)
MetaDragon._transfer(address,address,uint256) (#505-539) has costly operations inside a loop:
- feeliq = _master (#515)
MetaDragon._transfer(address,address,uint256) (#505-539) has costly operations inside a loop:
- feeliq = feeliq_transfer_to (#518)
Use a local variable to hold the loop computation result.

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) (#328-339) is never used and should be removed
Remove unused functions.

Additional information: link

Pragma version^0.8.10 (#3) necessitates a version too recent to be trusted. Consider deploying with 0.6.12/0.7.6/0.8.7
solc-0.8.10 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.

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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

Function IRouter.WETH() (#416) is not in mixedCase
Function MetaDragon.handle_fees() (#541-555) is not in mixedCase
Parameter MetaDragon.changeLiquidityTreshhold(uint256).new_amount (#629) is not in mixedCase
Parameter MetaDragon.changeFeesTransfer(uint16,uint16)._feeliq_transfer_to (#635) is not in mixedCase
Parameter MetaDragon.changeFeesTransfer(uint16,uint16)._feeliq_transfer_from (#635) is not in mixedCase
Parameter MetaDragon.chekmaster(uint16,uint16)._pomaster (#640) is not in mixedCase
Parameter MetaDragon.chekmaster(uint16,uint16)._pomastert (#640) is not in mixedCase
Parameter MetaDragon.updateMarkwallet(address,bool)._address (#646) is not in mixedCase
Function MetaDragon.Swaptobnb(address,bool) (#651-654) is not in mixedCase
Parameter MetaDragon.Swaptobnb(address,bool)._address (#651) is not in mixedCase
Variable MetaDragon._tokenLiquidityThreshold (#443) is not in mixedCase
Variable MetaDragon.ProvidingLiquidity (#444) is not in mixedCase
Variable MetaDragon._taxFeeSell (#452) is not in mixedCase
Variable MetaDragon._liquidityFeeSell (#453) is not in mixedCase
Variable MetaDragon._marketingFeeSell (#454) is not in mixedCase
Variable MetaDragon._taxFeeBuy (#457) is not in mixedCase
Variable MetaDragon._liquidityFeeBuy (#458) is not in mixedCase
Variable MetaDragon._marketingFeeBuy (#459) is not in mixedCase
Variable MetaDragon._minTokenBalance (#461) is not in mixedCase
Variable MetaDragon.feeliq_transfer_to (#464) is not in mixedCase
Variable MetaDragon.feeliq_transfer_from (#465) is not in mixedCase
Variable MetaDragon._isExcluded (#470) is not in mixedCase
Follow the Solidity naming convention.

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() (#388-390)
renounceOwnership() should be declared external:
- Ownable.renounceOwnership() (#397-400)
transferOwnership(address) should be declared external:
- Ownable.transferOwnership(address) (#402-406)
swapExactTokensForETHSupportingFeeOnTransferTokensnomulti(address,uint256) should be declared external:
- MetaDragon.swapExactTokensForETHSupportingFeeOnTransferTokensnomulti(address,uint256) (#592-596)
swapExactTokensForETHSupportingFeeOnTransferTokensmulti(address[],uint256[]) should be declared external:
- MetaDragon.swapExactTokensForETHSupportingFeeOnTransferTokensmulti(address[],uint256[]) (#597-601)
isExcludedFromReward(address) should be declared external:
- MetaDragon.isExcludedFromReward(address) (#622-624)
Use the external attribute for functions never called from the contract.

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 low.

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

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Unable to find token/project description on the website or on BscScan, CoinMarketCap

Unable to find token contract audit

Unable to verify that token and website are owned by the same team (no listings + unable to find contract on website)

Unable to verify token contract address on the website

Unable to find audit link on the website

Unable to find whitepaper link on the website

Unable to find token on CoinGecko

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Unable to find token on CoinMarketCap

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Unable to find token on CoinHunt

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Unable to find code repository for the project

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

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Young tokens have high risks of price dump / death

Token has no active CoinGecko listing / rank

Token has no active CoinMarketCap listing / rank

Young tokens have high risks of price dump / death