ArbInu

Smart Contract Audit Report

Audit Summary

ArbInu is a new ERC-20 token on Arbitrum.

For this audit, we reviewed the project team's ArbInu contract at 0xdd8e557c8804d326c72074e987de02a23ae6ef84 on the Arbitrum Mainnet.

Audit Findings

Informational findings were identified and the team may want to review them.
Date: January 30th, 2023.

Finding #1 - ArbInu - Informational

Description: The basePair and router state variables and the swapTokensForEth and addLiquidity functions are not used in the contract.
Recommendation: The above state variables and functions should either be removed to reduce contract size and deployment costs or utilized in a way that fits the project team's intended functionality.

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Finding #2 - ArbInu - Informational

Description: The getBasePairAddr function returns the basePair address. basePair is set to the 0x00 address and cannot be modified.
Recommendation: The above function should either be removed to reduce contract size and deployment costs or modified in a way that fits the project team's intended functionality.

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Finding #3 - ArbInu - Informational

Description: Although the SafeMath library is utilized, the contract is deployed with Solidity v0.8.17 which has built-in overflow/underflow checks.
Recommendation: SafeMath could be safely removed to reduce contract size, deployment costs, and gas costs on all transactions that utilize it.

Contract Overview

• The total supply of the token is set to 1 billion $ARBINU [1,000,000,000].
• No public mint or 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 2,595 total token holders. The token allocation is as follows:
  • 5.47% of the total supply belongs to the deployer.
  • 10% of the total supply is split between the 0x00 address, 0x001 address, 0x002 address, 0x003 address, 0x004 address, and the 0x..dead address.
  • The next five EOAs own a cumulative 8.62% of the total supply.
  • 6.15% of the total supply is in Sushiswap liquidity.
  • Of that liquidity, 91.69% of the LP tokens are stored in a DXSale token locking contract and will unlock on December 31st, 2023.
  • 5.74% of the LP tokens belong to an EOA.
  
  
• The contract enforces a maximum wallet amount that prevents a transfer from occurring if the recipient's token balance will exceed 20 million tokens after the transfer occurs.
• Although a maximum transaction limit is present in the contract, it has been permanently disabled.
• There is a 4% Dev fee on all transfers where neither the sender nor the recipient is excluded from fees.
• The tokens collected through the Dev fee are sent to the team's Dev wallet.
• As the contract is deployed with Solidity v0.8.17, it is protected from overflows/underflows.
• The contract complies with the ERC-20 token standard.

Ownership Controls:

• Ownership has been renounced by the team.
• The owner was previously able to set the Dev fee to any percentage at any time.
• The owner was previously able to enable/disable the Dev fee at any time.
• The owner was previously able to exclude and include accounts from the Dev fee at any time.
• The owner was previously able to update the maximum transaction limit to any value at any time.
• The owner was previously able to exclude and include accounts from the maximum transaction and maximum wallet restrictions at any time.
• The owner was previously able to update the team's Dev wallet to any address at any time.

Audit Results

Inheritance Chart

Function Graph

Functions Overview

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

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

 +  Context 
    - [Int] _msgSender
    - [Int] _msgData

 +  Ownable (Context)
    - [Pub]  #
    - [Pub] owner
    - [Int] _checkOwner
    - [Pub] renounceOwnership #
       - modifiers: onlyOwner
    - [Pub] transferOwnership #
       - modifiers: onlyOwner
    - [Int] _transferOwnership #

 + [Lib] SafeMath 
    - [Int] tryAdd
    - [Int] trySub
    - [Int] tryMul
    - [Int] tryDiv
    - [Int] tryMod
    - [Int] add
    - [Int] sub
    - [Int] mul
    - [Int] div
    - [Int] mod
    - [Int] sub
    - [Int] div
    - [Int] mod

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

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

 + [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 #

 +  ArbInu (Context, IERC20, Ownable)
    - [Pub]  #
    - [Pub] name
    - [Pub] symbol
    - [Pub] decimals
    - [Pub] totalSupply
    - [Pub] balanceOf
    - [Pub] getBasePairAddr
    - [Pub] transfer #
    - [Pub] allowance
    - [Pub] approve #
    - [Pub] transferFrom #
    - [Pub] increaseAllowance #
    - [Pub] decreaseAllowance #
    - [Pub] excludeFromFee #
       - modifiers: onlyOwner
    - [Pub] includeInFee #
       - modifiers: onlyOwner
    - [Pub] excludeFromMaxAmount #
       - modifiers: onlyOwner
    - [Pub] includeInMaxAmount #
       - modifiers: onlyOwner
    - [Ext] setDevFeePercent #
       - modifiers: onlyOwner
    - [Ext] setMaxTxPercent #
       - modifiers: onlyOwner
    - [Pub] setDevWalletAddress #
       - modifiers: onlyOwner
    - [Ext] replaceDevWalletAddress #
       - modifiers: onlyOwner
    - [Ext]  ($)
    - [Prv] _getValues
    - [Prv] _takeDev #
    - [Prv] calculateDevFee
    - [Prv] removeAllFee #
    - [Prv] restoreAllFee #
    - [Pub] isExcludedFromFee
    - [Pub] isExcludedFromMaxAmount
    - [Prv] _approve #
    - [Prv] _transfer #
    - [Prv] swapTokensForEth #
    - [Prv] addLiquidity #
    - [Prv] _tokenTransfer #
    - [Pub] disableFees #
       - modifiers: onlyOwner
    - [Pub] enableFees #
       - modifiers: onlyOwner

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What is a Solidity Audit?

Typically, a smart contract audit is a comprehensive review process designed to discover logical errors, security vulnerabilities, and optimization opportunities within code. A Solidity 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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