Fantasy Token

Smart Contract Audit Report

Audit Summary

Fantasy Token Audit Report Fantasy Token is a new ERC-20 token on Polygon.

For this audit, we reviewed the project team's FantasyDigital contract at 0xe0d4a49c386f5c0184f72ac0752aad4bd62c579a on the Polygon Mainnet.

Audit Findings

Informational findings were identified and the team may want to review them. In addition, centralized aspects are present.
Date: September 28th, 2022.

Finding #1 - FantasyDigital - Informational

Description: The BurnAcc state variable can never be modified but is not declared constant.
Recommendation: This state variable can be declared constant for additional gas savings on each reference.

Contract Overview

  • The total supply of the token is set to 500 million $FTXXX [500,000,000].
  • No public mint or burn functions exist, though the circulating supply can be decreased by sending tokens to the 0x..dead address.
  • At the time of writing this report, there are 133 total token holders. The token allocation is as follows:
    • 89.56% of the total supply belongs to the owner.
    • 4.73% of the total supply is stored in the UniswapV3Pool contract.
    • The next five holders own a cumulative 4.53% of the total supply.

  • The contract enforces a maximum transaction amount (determined by the owner) which imposes a limit to the number of tokens that can be transferred during any given transaction.
  • The contract features a cool-down mechanism that prevents users from transferring tokens if the cool-down time (set by the team) since the users' last transfer has not yet elapsed.
  • The team must ensure that the proper address exclusions are made from the above restrictions.
  • There is a Team fee, Promo fee, and Burn fee on all transfers where neither the sender nor the recipient is excluded from fees.
  • The tokens collected through the Team fee and Promo fee are sent to the team's Team wallet and Promo wallet respectively.
  • The tokens collected through the Burn fee are sent to the 0x..dead address.
  • As the contract is deployed with Solidity v0.8.9, it is safe from any possible overflows/underflows.
  • The contract complies with the ERC-20 token standard.
Ownership Controls:
  • The owner can set the Team fee and Promo fee to any percentages at any time.
  • The owner can set the Burn fee to any percentage up to 1% at any time.
  • The owner can exclude and include accounts from transfer fees.
  • The owner can pause/unpause trading at any time.
  • The owner can set the maximum transaction amount to any value at any time.
  • The owner can exclude and include accounts from the maximum transaction amount restriction at any time.
  • The owner can set the cool-down time limit to any value at any time.
  • The owner can exclude and include accounts from the cool-down restriction at any time.
  • The owner can update the team's Promo wallet and Team wallet at any time.

Audit Results

Vulnerability Category Notes Result
Arbitrary Jump/Storage Write N/A PASS
Centralization of Control
  • The owner can set the Team fee and Promo fee to any percentages at any time.
  • The owner can pause trading at any time.
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

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

 +  Ownable (Context)
    - [Pub]  #
    - [Pub] owner
    - [Pub] RenounceOwnership #
       - modifiers: onlyOwner
    - [Pub] TransferOwnership #
       - modifiers: onlyOwner
    - [Int] _transferOwnership #

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

 +  Pausable (Ownable)
    - [Pub] Pause #
       - modifiers: onlyOwner,whenNotPaused
    - [Pub] Unpause #
       - modifiers: onlyOwner,whenPaused

 +  FantasyDigital (Context, IERC20, Ownable, Pausable)
    - [Pub] name
    - [Pub] symbol
    - [Pub] decimals
    - [Pub] totalSupply
    - [Pub] balanceOf
    - [Pub] FDTeamtax
    - [Pub] Promotax
    - [Pub] Burntax
    - [Pub] transfer #
       - modifiers: whenNotPaused
    - [Pub] getPromoaddress
    - [Pub] getTeamAddress
    - [Pub] getBurnAddress
    - [Pub] allowance
    - [Pub] approve #
    - [Prv] _approve #
    - [Ext] setBurnPercent #
       - modifiers: onlyOwner
    - [Ext] SetTeamTaxPercent #
       - modifiers: onlyOwner
    - [Ext] SetPromoTaxPercent #
       - modifiers: onlyOwner
    - [Pub] excludeFromTimeLimit #
       - modifiers: onlyOwner
    - [Pub] setTimeLimit #
       - modifiers: onlyOwner
    - [Pub] setMaxTXLimit #
       - modifiers: onlyOwner
    - [Pub] ExcludeFromTax #
       - modifiers: onlyOwner
    - [Pub] excludeFromMaxTxLimit #
       - modifiers: onlyOwner
    - [Pub] IncludeInTax #
       - modifiers: onlyOwner
    - [Pub] transferFrom #
       - modifiers: whenNotPaused
    - [Prv] _transfer #
    - [Prv] _transferStandard #
    - [Prv] _standardTransferContent #
    - [Int] _getCalculatedFees
    - [Int] _TeamTransfer #
    - [Int] _PromoTransfer #
    - [Int] _BurnTransfer #
    - [Pub] TransferOwnership #
       - modifiers: onlyOwner
    - [Prv] removeAllFee #
    - [Prv] restoreAllFee #
    - [Pub]  #
    - [Ext] SetPromoAddress #
       - modifiers: onlyOwner
    - [Ext] SetTeamAddress #
       - 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.