RocketX Exchange BSC

Smart Contract Audit Report

Audit Summary

RocketX Exchange is a new BEP-20 token on the Binance Smart Chain.

For this audit, we reviewed the project team's RocketXExchangeV2 contract at 0x267e0c7456df5254492127ea7b2e14e556b492b8 on the Binance Smart Chain Mainnet.

Audit Findings

All findings have been resolved, though some centralized aspects are present.
Date: August 25th, 2023.
Updated: February 21st, 2024 to reflect the contract's Mainnet address.
Updated: March 11th, 2024 to reflect the contract's updated BSC Mainnet address.
Updated: March 12th, 2024 to reflect the contract's updated BSC Mainnet address that resolves Finding #1.

Finding #1 - RocketXExchangeV2 - Low (Resolved)

Description: The burnFrom() function is designed to let users burn tokens on behalf of another user, up to the allowance granted to them. However, tokens are always burned from the caller's address as msgSender is the parameter passed into the _specialBurn() function.

function burnFrom(address account, uint256 amount) public override(ERC20Burnable) {
    _spendAllowance(account, _msgSender(), amount * 10 ** 18);
    _specialBurn(_msgSender(), amount * 10 ** 18);
}

Risk/Impact: Users are unable to burn tokens on behalf of another address; all burns made through the burnFrom() function are always via the caller's wallet address.
Recommendation: The burnFrom() function should be modified to pass account into the _specialBurn() function rather than msgSender.
Resolution: The team has implemented the above recommendation.

Contract Overview

• The initial supply of the token is set to 28 million $RVF [28,000,000].
• The owner can mint any number of tokens to their own address at any time as long as the total supply cap of 99.3 million tokens is not exceeded.
• Any user can burn their own tokens to reduce the total supply at any time.
• Any user can burn tokens on another user's behalf up to their granted allowance.
• At the time of writing this report, 100% of the total supply belongs to the owner.


• There is a Buy fee and Sell fee on all buys and sells via an approved DEX where neither the sender nor the recipient is excluded from fees.
• A portion of the tokens collected through the fee is burned, while the remaining portion is sent to the owner, based on the respective percentages set by the owner for burning and Dev allocation.
• The contract enforces a burn cap of 20 million tokens through fees. Once this cap is reached, all tokens collected through fees are allocated to the owner.
• As the contract is deployed with Solidity v0.8.21, it is protected from overflows/underflows.
• The contract complies with the BEP-20 token standard.


• The owner can set the Buy fee and Sell fee to any percentages at any time.
• The owner can set the Burn allocation and Dev allocation to any percentages as long as their combined percentage is 100%.
• The owner can exclude and include accounts from the Buy fee and Sell fee at any time.
• The owner can add/remove any address from the approved DEX list at any time.
• The owner can withdraw any tokens or BNB erroneously sent to the contract at any time.

Audit Results

Inheritance Chart

Function Graph

Functions Overview

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

 + [Int] IUniswapV3PoolEvents 

 + [Int] IUniswapV3PoolOwnerActions 
    - [Ext] setFeeProtocol #
    - [Ext] collectProtocol #

 + [Int] IUniswapV3PoolActions 
    - [Ext] initialize #
    - [Ext] mint #
    - [Ext] collect #
    - [Ext] burn #
    - [Ext] swap #
    - [Ext] flash #
    - [Ext] increaseObservationCardinalityNext #

 + [Int] IUniswapV3PoolDerivedState 
    - [Ext] observe
    - [Ext] snapshotCumulativesInside

 + [Int] IUniswapV3PoolState 
    - [Ext] slot0
    - [Ext] feeGrowthGlobal0X128
    - [Ext] feeGrowthGlobal1X128
    - [Ext] protocolFees
    - [Ext] liquidity
    - [Ext] ticks
    - [Ext] tickBitmap
    - [Ext] positions
    - [Ext] observations

 + [Int] IUniswapV3PoolImmutables 
    - [Ext] factory
    - [Ext] token0
    - [Ext] token1
    - [Ext] fee
    - [Ext] tickSpacing
    - [Ext] maxLiquidityPerTick

 + [Int] IUniswapV3Pool (IUniswapV3PoolImmutables, IUniswapV3PoolState, IUniswapV3PoolDerivedState, IUniswapV3PoolActions, IUniswapV3PoolOwnerActions, IUniswapV3PoolEvents)

 + [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] IUniswapV3Factory 
    - [Ext] owner
    - [Ext] feeAmountTickSpacing
    - [Ext] getPool
    - [Ext] createPool #
    - [Ext] setOwner #
    - [Ext] enableFeeAmount #

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

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

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

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

 +  Ownable2Step (Ownable)
    - [Pub] pendingOwner
    - [Pub] transferOwnership #
       - modifiers: onlyOwner
    - [Int] _transferOwnership #
    - [Pub] acceptOwnership #

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

 + [Int] IERC20Metadata (IERC20)
    - [Ext] name
    - [Ext] symbol
    - [Ext] decimals

 +  ERC20 (Context, IERC20, IERC20Metadata)
    - [Pub]  #
    - [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 #

 +  ERC20Burnable (Context, ERC20)
    - [Pub] burn #
    - [Pub] burnFrom #

 +  RocketXExchangeV2 (ERC20, ERC20Burnable, Ownable2Step)
    - [Pub]  #
       - modifiers: ERC20
    - [Int] _calculateFee
    - [Int] _calculateTax
    - [Int] _isV2Pool
    - [Int] _isV3Pool
    - [Int] _isLiquidityPool #
    - [Int] _determineTax #
    - [Int] _specialBurn #
    - [Int] _applyFee #
    - [Int] _applyTax #
    - [Pub] transfer #
    - [Pub] transferFrom #
    - [Ext] mint #
       - modifiers: onlyOwner
    - [Pub] burn #
    - [Pub] burnFrom #
    - [Ext] updateTax #
       - modifiers: onlyOwner
    - [Ext] updateFee #
       - modifiers: onlyOwner
    - [Ext] updateExcluded #
       - modifiers: onlyOwner
    - [Ext] updatePool #
       - modifiers: onlyOwner
    - [Ext] transferAnyERC20Token #
       - modifiers: onlyOwner

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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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