NodeGrid

Smart Contract Audit Report

Audit Summary

NodeGrid Audit Report NodeGrid is a new BEP-20 token on the Binance Smart Chain that is an automatic liquidity providing protocol.

For this audit, we reviewed the project team's NodeGrid implementation contract at 0x2245416060e8e5a3d35e013f77c86975262fea70 and Proxy contract at 0xe9C615E0b739e16994a080cA99730Ec104F28CC4 on the Binance Smart Chain Mainnet.

We previously reviewed the project team's FeeManager and NodeManager contracts here.

Audit Findings

Please ensure trust in the team prior to investing as they have substantial control in the ecosystem.
Date: April 13th, 2022.
Finding #1 - NodeGrid - Medium
Description: The _isSelling local variable can be bypassed in the _transfer() function due to the msg.sender==address(uniswapV2Router) condition.
function _transfer {
...
bool _isSelling = _isSwappable && msg.sender==address(uniswapV2Router) && to==address(uniswapV2Pair);
...
}
Risk/Impact: This functionality can be exploited by a malicious contract in order to bypass the higher fees charged on sell transactions.
Recommendation: The msg.sender==address(uniswapV2Router) condition should be removed to only enforce the following:
bool _isSelling = _isSwappable && to==address(uniswapV2Pair);
Resolution: The team has not yet addressed this issue.

Contract Overview

The owner can transfer ownership to a new address after deployment. Upon doing so, 1 million tokens (100% of the total supply) will be minted to the new owner's wallet address.
No mint functions are accessible beyond the first transfer of ownership.
No burn functions are present, though the circulating supply can be decreased by sending tokens to the 0x..dead address.
At the time of writing this report, there are 661 total token holders. The token allocation is as follows:
83.19% of the total supply is stored in a proxy contract.
9.15% of the total supply belongs to an EOA.
5.28% of the total supply is in Pancakeswap liquidity.
Of that liquidity, 99.99% of the LP tokens belong to the owner.
The next five holders own a cumulative 1.37% of the total supply.

The contract enforces a maximum transfer amount (determined by the owner) which imposes a limit to the number of tokens that can be transferred in a single transaction.
The contract enforces a maximum wallet amount that prevents a transfer from occurring if the recipient's token balance will exceed the limit number of tokens (determined by the owner) after the transfer occurs.
Blacklisted accounts are prohibited from participating in transfers.
If the check node functionality is enabled by the team and a user is selling tokens via Pancakeswap, the user must currently have at least 1 node in order for the transaction to be successful.
There is a Liquidity fee and Operator fee on all transfers where neither the sender nor the recipient is excluded from fees. A separate fee structure can be set by the team to apply different fee percentages depending on whether the user is buying or selling during the transfer.
The Liquidity fee charged during transfers is stored in the contract address. The tokens are swapped for BNB for the purpose of funding Pancakeswap liquidity when the following conditions are met:
The threshold number of tokens (determined by the owner) in the contract address has been reached.
The contract is not currently performing an automatic liquidity add.
The caller is not initiating a buy transaction via Pancakeswap.
The caller is not the owner.
Liquidity-adds are automatically performed by selling the tokens collected as fees, pairing the received BNB with the token, and adding it as liquidity to the BNB pair.
The LP tokens received through this process are sent to the owner. We recommend that the team lock these newly acquired LP tokens.
The tokens collected through the Operator fee are swapped for BNB and sent to the team's Operator wallet.
The contract is upgradable, meaning the team can swap out the current contract for a new one at any time.
The contract utilizes the SafeMath library to protect against overflows/underflows.
The contract complies with the BEP-20 token standard.
Ownership Controls:
The owner can modify the Liquidity fee and Operator fee for each fee structure to any percentages at any time.
The owner can modify the percentage of tokens that are allocated to each fund (Liquidity and Operator) to any percentages at any time.
The owner can exclude and include accounts from transfer fees.
The owner can set the maximum transfer amount and maximum wallet amount to any values at any time.
The owner can enable/disable the check node functionality at any time.
The owner can withdraw any tokens and BNB from the contract at any time.
The owner can add accounts to the transfer blacklist at any time.
The owner can update the threshold number of tokens needed to perform an automatic liquidity add.
The owner can update the Pancakeswap Router address at any time.
The owner can update the Node Manager address at any time.
The owner can update the team's Operator wallet at any time.

Audit Results

Vulnerability Category	Notes	Result
Arbitrary Storage Write	N/A	PASS
Arbitrary Jump	N/A	PASS
Centralization of Control	The owner can set each fee percentage up to 100%. The LP tokens generated through automatic liquidity adds are sent to the owner. The owner currently owns 99.99% of the LP tokens. The team can upgrade the contract at any time. The owner can add accounts to the transfer blacklist. The owner can withdraw any tokens from the contract.	WARNING
Compiler Issues	N/A	PASS
Delegate Call to Untrusted Contract	N/A	PASS
Dependence on Predictable Variables	N/A	PASS
Ether/Token Theft	N/A	PASS
Flash Loans	N/A	PASS
Front Running	N/A	PASS
Improper Events	N/A	PASS
Improper Authorization Scheme	N/A	PASS
Integer Over/Underflow	N/A	PASS
Logical Issues	N/A	PASS
Oracle Issues	N/A	PASS
Outdated Compiler Version	N/A	PASS
Race Conditions	N/A	PASS
Reentrancy	N/A	PASS
Signature Issues	N/A	PASS
Unbounded Loops	N/A	PASS
Unused Code	N/A	PASS
Overall Contract Safety		PASS

Inheritance Chart

Smart Contract Audit - Inheritance

Function Graph

Smart Contract Audit - Graph

Functions Overview


 ($) = payable function
 # = non-constant function
 
 Int = Internal
 Ext = External
 Pub = Public

 + [Int] IUniswapV2Factory 
    - [Ext] feeTo
    - [Ext] feeToSetter
    - [Ext] getPair
    - [Ext] allPairs
    - [Ext] allPairsLength
    - [Ext] createPair #
    - [Ext] setFeeTo #
    - [Ext] setFeeToSetter #

 + [Int] IUniswapV2Pair 
    - [Ext] name
    - [Ext] symbol
    - [Ext] decimals
    - [Ext] totalSupply
    - [Ext] balanceOf
    - [Ext] allowance
    - [Ext] approve #
    - [Ext] transfer #
    - [Ext] transferFrom #
    - [Ext] DOMAIN_SEPARATOR
    - [Ext] PERMIT_TYPEHASH
    - [Ext] nonces
    - [Ext] permit #
    - [Ext] MINIMUM_LIQUIDITY
    - [Ext] factory
    - [Ext] token0
    - [Ext] token1
    - [Ext] getReserves
    - [Ext] price0CumulativeLast
    - [Ext] price1CumulativeLast
    - [Ext] kLast
    - [Ext] mint #
    - [Ext] burn #
    - [Ext] swap #
    - [Ext] skim #
    - [Ext] sync #
    - [Ext] initialize #

 + [Int] IUniswapV2Router01 
    - [Ext] factory
    - [Ext] WETH
    - [Ext] addLiquidity #
    - [Ext] addLiquidityETH ($)
    - [Ext] removeLiquidity #
    - [Ext] removeLiquidityETH #
    - [Ext] removeLiquidityWithPermit #
    - [Ext] removeLiquidityETHWithPermit #
    - [Ext] swapExactTokensForTokens #
    - [Ext] swapTokensForExactTokens #
    - [Ext] swapExactETHForTokens ($)
    - [Ext] swapTokensForExactETH #
    - [Ext] swapExactTokensForETH #
    - [Ext] swapETHForExactTokens ($)
    - [Ext] quote
    - [Ext] getAmountOut
    - [Ext] getAmountIn
    - [Ext] getAmountsOut
    - [Ext] getAmountsIn

 + [Int] IUniswapV2Router02 (IUniswapV2Router01)
    - [Ext] removeLiquidityETHSupportingFeeOnTransferTokens #
    - [Ext] removeLiquidityETHWithPermitSupportingFeeOnTransferTokens #
    - [Ext] swapExactTokensForTokensSupportingFeeOnTransferTokens #
    - [Ext] swapExactETHForTokensSupportingFeeOnTransferTokens ($)
    - [Ext] swapExactTokensForETHSupportingFeeOnTransferTokens #

 + [Lib] Address 
    - [Int] isContract
    - [Int] sendValue #
    - [Int] functionCall #
    - [Int] functionCall #
    - [Int] functionCallWithValue #
    - [Int] functionCallWithValue #
    - [Prv] _functionCallWithValue #

 + [Lib] SafeMath 
    - [Int] add
    - [Int] sub
    - [Int] sub
    - [Int] mul
    - [Int] div
    - [Int] div
    - [Int] mod
    - [Int] mod

 + [Int] IERC20 
    - [Ext] totalSupply
    - [Ext] balanceOf
    - [Ext] transfer #
    - [Ext] allowance
    - [Ext] approve #
    - [Ext] transferFrom #

 + [Int] IERC20Upgradeable 
    - [Ext] totalSupply
    - [Ext] balanceOf
    - [Ext] transfer #
    - [Ext] allowance
    - [Ext] approve #
    - [Ext] transferFrom #

 + [Int] IERC20MetadataUpgradeable (IERC20Upgradeable)
    - [Ext] name
    - [Ext] symbol
    - [Ext] decimals

 + [Lib] AddressUpgradeable 
    - [Int] isContract
    - [Int] sendValue #
    - [Int] functionCall #
    - [Int] functionCall #
    - [Int] functionCallWithValue #
    - [Int] functionCallWithValue #
    - [Int] functionStaticCall
    - [Int] functionStaticCall
    - [Int] verifyCallResult

 +  Initializable 
    - [Prv] _isConstructor

 +  ContextUpgradeable (Initializable)
    - [Int] __Context_init #
       - modifiers: onlyInitializing
    - [Int] __Context_init_unchained #
       - modifiers: onlyInitializing
    - [Int] _msgSender
    - [Int] _msgData

 +  ERC20Upgradeable (Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable)
    - [Int] __ERC20_init #
       - modifiers: onlyInitializing
    - [Int] __ERC20_init_unchained #
       - modifiers: onlyInitializing
    - [Pub] name
    - [Pub] symbol
    - [Pub] decimals
    - [Pub] totalSupply
    - [Pub] balanceOf
    - [Pub] transfer #
    - [Pub] allowance
    - [Pub] approve #
    - [Pub] transferFrom #
    - [Pub] increaseAllowance #
    - [Pub] decreaseAllowance #
    - [Int] _transfer #
    - [Int] _mint #
    - [Int] _burn #
    - [Int] _approve #
    - [Int] _spendAllowance #
    - [Int] _beforeTokenTransfer #
    - [Int] _afterTokenTransfer #

 + [Lib] console 
    - [Prv] _sendLogPayload
    - [Int] log
    - [Int] logInt
    - [Int] logUint
    - [Int] logString
    - [Int] logBool
    - [Int] logAddress
    - [Int] logBytes
    - [Int] logBytes1
    - [Int] logBytes2
    - [Int] logBytes3
    - [Int] logBytes4
    - [Int] logBytes5
    - [Int] logBytes6
    - [Int] logBytes7
    - [Int] logBytes8
    - [Int] logBytes9
    - [Int] logBytes10
    - [Int] logBytes11
    - [Int] logBytes12
    - [Int] logBytes13
    - [Int] logBytes14
    - [Int] logBytes15
    - [Int] logBytes16
    - [Int] logBytes17
    - [Int] logBytes18
    - [Int] logBytes19
    - [Int] logBytes20
    - [Int] logBytes21
    - [Int] logBytes22
    - [Int] logBytes23
    - [Int] logBytes24
    - [Int] logBytes25
    - [Int] logBytes26
    - [Int] logBytes27
    - [Int] logBytes28
    - [Int] logBytes29
    - [Int] logBytes30
    - [Int] logBytes31
    - [Int] logBytes32
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
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    - [Int] log
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    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log
    - [Int] log

 + [Int] INodeManager 
    - [Ext] feeManager
    - [Ext] countOfUser

 +  NodeGrid (ERC20Upgradeable)
    - [Pub] initialize #
       - modifiers: initializer
    - [Ext]  ($)
    - [Pub] transferOwnership #
       - modifiers: onlyOwner
    - [Pub] setTransferTaxRate #
       - modifiers: onlyOwner
    - [Pub] buyFee
    - [Pub] setBuyFee #
       - modifiers: onlyOwner
    - [Pub] sellFee
    - [Pub] setSellFee #
       - modifiers: onlyOwner
    - [Pub] setOperator #
       - modifiers: onlyOwner
    - [Pub] setOperatorFee #
       - modifiers: onlyOwner
    - [Pub] setLiquidityFee #
       - modifiers: onlyOwner
    - [Pub] setExcludedFromFee #
       - modifiers: onlyOwner
    - [Pub] removeExcludedFromFee #
       - modifiers: onlyOwner
    - [Pub] setMinAmountToLiquify #
       - modifiers: onlyOwner
    - [Pub] setMaxTransferAmount #
       - modifiers: onlyOwner
    - [Pub] setMaxWalletAmount #
       - modifiers: onlyOwner
    - [Pub] setNodeManagerAddress #
       - modifiers: onlyOwner
    - [Pub] setCheckNodeBeforeSell #
       - modifiers: onlyOwner
    - [Int] _transfer #
    - [Prv] swapAndSendToAddress #
       - modifiers: lockTheSwap,transferTaxFree
    - [Prv] swapAndLiquify #
       - modifiers: lockTheSwap,transferTaxFree
    - [Prv] swapTokensForEth #
    - [Prv] addLiquidity #
    - [Pub] updateRouter #
       - modifiers: onlyOwner
    - [Pub] claimTokens #
       - modifiers: onlyOwner
    - [Ext] claimOtherTokens #
       - modifiers: onlyOwner
    - [Ext] clearStuckBalance #
       - modifiers: onlyOwner
    - [Pub] addBlacklist #
       - modifiers: onlyOwner

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Our firm is well-reputed in the community and is trusted as a top smart contract auditing company for the review of solidity code, no matter how complex. Our team of experienced solidity smart contract auditors performs audits for tokens, NFTs, crowdsales, marketplaces, gambling games, financial protocols, and more!

What is a SourceHat Audit?

Typically, a smart contract audit is a comprehensive review process designed to discover logical errors, security vulnerabilities, and optimization opportunities within code. A SourceHat Audit takes this a step further by verifying economic logic to ensure the stability of smart contracts and highlighting privileged functionality to create a report that is easy to understand for developers and community members alike.

How Do I Interpret the Findings?

Each of our Findings will be labeled with a Severity level. We always recommend the team resolve High, Medium, and Low severity findings prior to deploying the code to the mainnet. Here is a breakdown on what each Severity level means for the project:

High severity indicates that the issue puts a large number of users' funds at risk and has a high probability of exploitation, or the smart contract contains serious logical issues which can prevent the code from operating as intended.
Medium severity issues are those which place at least some users' funds at risk and has a medium to high probability of exploitation.
Low severity issues have a relatively minor risk association; these issues have a low probability of occurring or may have a minimal impact.
Informational issues pose no immediate risk, but inform the project team of opportunities for gas optimizations and following smart contract security best practices.

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