MERD [Mermaid] Token

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Mermaid._writeCheckpoint(address,uint32,uint256,uint256) (contracts/Mermaid.sol#313-338) uses a dangerous strict equality:
- nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber (contracts/Mermaid.sol#325-326)
Don't use strict equality to determine if an account has enough Ether or tokens.

Additional information: link

BEP20.constructor(string,string).name (contracts/libs/BEP20.sol#59) shadows:
- BEP20.name() (contracts/libs/BEP20.sol#75-77) (function)
- IBEP20.name() (contracts/libs/IBEP20.sol#25) (function)
BEP20.constructor(string,string).symbol (contracts/libs/BEP20.sol#59) shadows:
- BEP20.symbol() (contracts/libs/BEP20.sol#89-91) (function)
- IBEP20.symbol() (contracts/libs/IBEP20.sol#20) (function)
BEP20.allowance(address,address).owner (contracts/libs/BEP20.sol#123) shadows:
- Ownable.owner() (@openzeppelin/contracts/access/Ownable.sol#34-36) (function)
BEP20._approve(address,address,uint256).owner (contracts/libs/BEP20.sol#295) shadows:
- Ownable.owner() (@openzeppelin/contracts/access/Ownable.sol#34-36) (function)
Rename the local variables that shadow another component.

Additional information: link

Mermaid.delegateBySig(address,uint256,uint256,uint8,bytes32,bytes32) (contracts/Mermaid.sol#179-214) uses timestamp for comparisons
Dangerous comparisons:
- require(bool,string)(block.timestamp <= expiry,MERD::delegateBySig: signature expired) (contracts/Mermaid.sol#209-212)
Avoid relying on block.timestamp.

Additional information: link

Address.isContract(address) (@openzeppelin/contracts/utils/Address.sol#26-36) uses assembly
- INLINE ASM (@openzeppelin/contracts/utils/Address.sol#32-34)
Address.verifyCallResult(bool,bytes,string) (@openzeppelin/contracts/utils/Address.sol#195-215) uses assembly
- INLINE ASM (@openzeppelin/contracts/utils/Address.sol#207-210)
Mermaid.getChainId() (contracts/Mermaid.sol#349-355) uses assembly
- INLINE ASM (contracts/Mermaid.sol#351-353)
Do not use evm assembly.

Additional information: link

Different versions of Solidity is used:
- Version used: ['>=0.4.22<0.9.0', '>=0.8.0', '^0.8.0']
- ^0.8.0 (@openzeppelin/contracts/access/Ownable.sol#3)
- ^0.8.0 (@openzeppelin/contracts/utils/Address.sol#3)
- ^0.8.0 (@openzeppelin/contracts/utils/Context.sol#3)
- ^0.8.0 (@openzeppelin/contracts/utils/math/SafeMath.sol#3)
- >=0.8.0 (contracts/Mermaid.sol#3)
- >=0.4.22<0.9.0 (contracts/libs/BEP20.sol#3)
- >=0.4.22<0.9.0 (contracts/libs/IBEP20.sol#3)
Use one Solidity version.

Additional information: link

Address.functionCall(address,bytes) (@openzeppelin/contracts/utils/Address.sol#79-81) is never used and should be removed
Address.functionCall(address,bytes,string) (@openzeppelin/contracts/utils/Address.sol#89-95) is never used and should be removed
Address.functionCallWithValue(address,bytes,uint256) (@openzeppelin/contracts/utils/Address.sol#108-114) is never used and should be removed
Address.functionCallWithValue(address,bytes,uint256,string) (@openzeppelin/contracts/utils/Address.sol#122-133) is never used and should be removed
Address.functionDelegateCall(address,bytes) (@openzeppelin/contracts/utils/Address.sol#168-170) is never used and should be removed
Address.functionDelegateCall(address,bytes,string) (@openzeppelin/contracts/utils/Address.sol#178-187) is never used and should be removed
Address.functionStaticCall(address,bytes) (@openzeppelin/contracts/utils/Address.sol#141-143) is never used and should be removed
Address.functionStaticCall(address,bytes,string) (@openzeppelin/contracts/utils/Address.sol#151-160) is never used and should be removed
Address.isContract(address) (@openzeppelin/contracts/utils/Address.sol#26-36) is never used and should be removed
Address.sendValue(address,uint256) (@openzeppelin/contracts/utils/Address.sol#54-59) is never used and should be removed
Address.verifyCallResult(bool,bytes,string) (@openzeppelin/contracts/utils/Address.sol#195-215) is never used and should be removed
BEP20._burnFrom(address,uint256) (contracts/libs/BEP20.sol#312-319) is never used and should be removed
Context._msgData() (@openzeppelin/contracts/utils/Context.sol#20-22) is never used and should be removed
SafeMath.div(uint256,uint256) (@openzeppelin/contracts/utils/math/SafeMath.sol#134-136) is never used and should be removed
SafeMath.div(uint256,uint256,string) (@openzeppelin/contracts/utils/math/SafeMath.sol#190-199) is never used and should be removed
SafeMath.mod(uint256,uint256) (@openzeppelin/contracts/utils/math/SafeMath.sol#150-152) is never used and should be removed
SafeMath.mod(uint256,uint256,string) (@openzeppelin/contracts/utils/math/SafeMath.sol#216-225) is never used and should be removed
SafeMath.mul(uint256,uint256) (@openzeppelin/contracts/utils/math/SafeMath.sol#120-122) is never used and should be removed
SafeMath.tryAdd(uint256,uint256) (@openzeppelin/contracts/utils/math/SafeMath.sol#21-27) is never used and should be removed
SafeMath.tryDiv(uint256,uint256) (@openzeppelin/contracts/utils/math/SafeMath.sol#63-68) is never used and should be removed
SafeMath.tryMod(uint256,uint256) (@openzeppelin/contracts/utils/math/SafeMath.sol#75-80) is never used and should be removed
SafeMath.tryMul(uint256,uint256) (@openzeppelin/contracts/utils/math/SafeMath.sol#46-56) is never used and should be removed
SafeMath.trySub(uint256,uint256) (@openzeppelin/contracts/utils/math/SafeMath.sol#34-39) is never used and should be removed
Remove unused functions.

Additional information: link

Pragma version^0.8.0 (@openzeppelin/contracts/access/Ownable.sol#3) allows old versions
Pragma version^0.8.0 (@openzeppelin/contracts/utils/Address.sol#3) allows old versions
Pragma version^0.8.0 (@openzeppelin/contracts/utils/Context.sol#3) allows old versions
Pragma version^0.8.0 (@openzeppelin/contracts/utils/math/SafeMath.sol#3) allows old versions
Pragma version>=0.8.0 (contracts/Mermaid.sol#3) allows old versions
Pragma version>=0.4.22<0.9.0 (contracts/libs/BEP20.sol#3) is too complex
Pragma version>=0.4.22<0.9.0 (contracts/libs/IBEP20.sol#3) is too complex
solc-0.8.0 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.

Additional information: link

Low level call in Address.sendValue(address,uint256) (@openzeppelin/contracts/utils/Address.sol#54-59):
- (success) = recipient.call{value: amount}() (@openzeppelin/contracts/utils/Address.sol#57)
Low level call in Address.functionCallWithValue(address,bytes,uint256,string) (@openzeppelin/contracts/utils/Address.sol#122-133):
- (success,returndata) = target.call{value: value}(data) (@openzeppelin/contracts/utils/Address.sol#131)
Low level call in Address.functionStaticCall(address,bytes,string) (@openzeppelin/contracts/utils/Address.sol#151-160):
- (success,returndata) = target.staticcall(data) (@openzeppelin/contracts/utils/Address.sol#158)
Low level call in Address.functionDelegateCall(address,bytes,string) (@openzeppelin/contracts/utils/Address.sol#178-187):
- (success,returndata) = target.delegatecall(data) (@openzeppelin/contracts/utils/Address.sol#185)
Avoid low-level calls. Check the call success. If the call is meant for a contract, check for code existence

Additional information: link

Parameter Mermaid.mint(address,uint256)._to (contracts/Mermaid.sol#57) is not in mixedCase
Parameter Mermaid.mint(address,uint256)._amount (contracts/Mermaid.sol#57) is not in mixedCase
Parameter Mermaid.burn(uint256)._amount (contracts/Mermaid.sol#71) is not in mixedCase
Variable Mermaid._delegates (contracts/Mermaid.sol#113) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Mermaid.burnWallet (contracts/Mermaid.sol#16) should be constant
Mermaid.initialMintWallet (contracts/Mermaid.sol#19) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

renounceOwnership() should be declared external:
- Ownable.renounceOwnership() (@openzeppelin/contracts/access/Ownable.sol#53-55)
transferOwnership(address) should be declared external:
- Ownable.transferOwnership(address) (@openzeppelin/contracts/access/Ownable.sol#61-64)
burn(uint256) should be declared external:
- Mermaid.burn(uint256) (contracts/Mermaid.sol#71-74)
operator() should be declared external:
- Mermaid.operator() (contracts/Mermaid.sol#95-97)
transferOperator(address) should be declared external:
- Mermaid.transferOperator(address) (contracts/Mermaid.sol#103-110)
decimals() should be declared external:
- BEP20.decimals() (contracts/libs/BEP20.sol#82-84)
symbol() should be declared external:
- BEP20.symbol() (contracts/libs/BEP20.sol#89-91)
transfer(address,uint256) should be declared external:
- BEP20.transfer(address,uint256) (contracts/libs/BEP20.sol#115-118)
allowance(address,address) should be declared external:
- BEP20.allowance(address,address) (contracts/libs/BEP20.sol#123-125)
approve(address,uint256) should be declared external:
- BEP20.approve(address,uint256) (contracts/libs/BEP20.sol#134-137)
transferFrom(address,address,uint256) should be declared external:
- BEP20.transferFrom(address,address,uint256) (contracts/libs/BEP20.sol#151-163)
increaseAllowance(address,uint256) should be declared external:
- BEP20.increaseAllowance(address,uint256) (contracts/libs/BEP20.sol#177-180)
decreaseAllowance(address,uint256) should be declared external:
- BEP20.decreaseAllowance(address,uint256) (contracts/libs/BEP20.sol#196-203)
mint(uint256) should be declared external:
- BEP20.mint(uint256) (contracts/libs/BEP20.sol#213-216)
Use the external attribute for functions never called from the contract.

Additional information: link

Contract ownership is semi-renounced (passed to a contract)

Average 30d PancakeSwap volume is less than $100. Token is either dead or inactive.

Average 30d PancakeSwap liquidity is low.

Average 30d number of PancakeSwap swaps is low.

Average PancakeSwap trading volume, liqudity, number of swaps are low. Token seems to be inactive.

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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Token was delisted (assigned to inactive / untracked listing) from CoinMarketCap

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Unable to find token contract audit

Unable to verify token contract address on the website

Unable to find audit link on the website

Unable to find token on CoinHunt

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Unable to find code repository for the project

Token is not listed at Mobula.Finance

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Token has no active CoinMarketCap listing / rank

Young tokens have high risks of price dump / death

Token has relatively low CoinGecko rank

Young tokens have high risks of price dump / death

Young tokens have high risks of price dump / death