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Token Integration Analyzer

Trail of BitsOfficialPublished by Trail of Bits

  • Skill
  • Review and audit
  • Security
  • CC-BY-SA-4.0
  • No issues found

From the author

Token integration and implementation analyzer based on Trail of Bits' token integration checklist. Analyzes token implementations for ERC20/ERC721 conformity, checks for 20+ weird token patterns, assesses contract composition and owner privileges, performs on-chain scarcity analysis, and evaluates how protocols handle non-standard tokens. Use when integrating or accepting arbitrary ERC20/ERC721 tokens, auditing a token implementation for standards conformity, or assessing risk from weird tokens such as fee-on-transfer, rebasing, missing return values, or blocklists.
— the description by Trail of Bits

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

The Token Integration Analyzer provides a systematic security review for smart contract tokens and protocols that interact with them. It leverages the Trail of Bits token integration checklist to evaluate codebases for ERC20/ERC721 standard conformity, identify risks from over 20 non-standard 'weird' token patterns, and assess contract composition, owner privileges, and integration safety. The tool supports both static analysis of Solidity code and on-chain analysis of deployed contracts to ensure robust handling of external token interactions.

What it does

  • Performs automated ERC20/ERC721 conformity checks using static analysis tools.
  • Identifies risks from 20+ known weird token patterns like fee-on-transfer or missing return values.
  • Evaluates contract composition, complexity, and owner privilege centralization.
  • Analyzes on-chain data for token scarcity, holder concentration, and configuration.
  • Provides a structured security report with prioritized remediation recommendations.
  • Validates integration safety patterns for protocols interacting with external tokens.

When to use it

  • When developing or auditing a new ERC20 or ERC721 token implementation.
  • Before integrating external tokens into a DeFi protocol or smart contract system.
  • When assessing the risk profile of arbitrary tokens accepted by a platform.
  • To verify that a protocol correctly handles non-standard token behaviors.

Advantages

  • Reduces risks associated with non-standard token behaviors in smart contract integrations.
  • Provides a comprehensive, standardized checklist based on industry-recognized security practices.
  • Combines static code analysis with on-chain data for a holistic security view.
  • Helps developers identify and fix critical vulnerabilities before mainnet deployment.

Usage examples

“Analyze my ERC20 token implementation for potential security risks and standard conformity.”
The agent will review the provided Solidity code, run conformity checks, identify any non-standard patterns, and provide a report on potential vulnerabilities.
“I am integrating USDT into my vault. What should I check for?”
The agent will analyze the integration code, specifically checking for missing return value handling and other known USDT-specific quirks.
“Assess the risks of this deployed token contract at address 0x123...”
The agent will perform an on-chain analysis of the contract, checking for holder concentration, owner privileges, and configuration risks.

Install

  1. Download the skill as a ZIP:

    https://mp-staging.autogineer.com/agent-skills/trailofbits/token-integration-analyzer/download
  2. Unzip it into the cross-client skills folder of your project:

    mkdir -p .agents/skills && unzip token-integration-analyzer.zip -d .agents/skills

Documentation by Trail of Bits

Token Integration Analyzer

Purpose

Systematically analyzes the codebase for token-related security concerns using Trail of Bits' token integration checklist:

  1. Token Implementations: Analyze if your token follows ERC20/ERC721 standards or has non-standard behavior

  2. Token Integrations: Analyze how your protocol handles arbitrary tokens, including weird/non-standard tokens

  3. On-chain Analysis: Query deployed contracts for scarcity, distribution, and configuration

  4. Security Assessment: Identify risks from 20+ known weird token patterns

Framework: Building Secure Contracts - Token Integration Checklist + Weird ERC20 Database


How This Works

Phase 1: Context Discovery

Determines analysis context:

  • Token implementation: Are you building a token contract?

  • Token integration: Does your protocol interact with external tokens?

  • Platform: Ethereum, other EVM chains, or different platform?

  • Token types: ERC20, ERC721, or both?

Phase 2: Slither Analysis (if Solidity)

For Solidity projects, I'll help run:

  • slither-check-erc - ERC conformity checks

  • slither --print human-summary - Complexity and upgrade analysis

  • slither --print contract-summary - Function analysis

  • slither-prop - Property generation for testing

Phase 3: Code Analysis

Analyzes:

  • Contract composition and complexity

  • Owner privileges and centralization risks

  • ERC20/ERC721 conformity

  • Known weird token patterns

  • Integration safety patterns

Phase 4: On-chain Analysis (if deployed)

If you provide a contract address, I'll query:

  • Token scarcity and distribution

  • Total supply and holder concentration

  • Exchange listings

  • On-chain configuration

Phase 5: Risk Assessment

Provides:

  • Identified vulnerabilities

  • Non-standard behaviors

  • Integration risks

  • Prioritized recommendations


Assessment Categories

I check 10 comprehensive categories covering all aspects of token security. For detailed criteria, patterns, and checklists, see ASSESSMENT_CATEGORIES.md.

Quick Reference:
  1. General Considerations - Security reviews, team transparency, security contacts

  2. Contract Composition - Complexity analysis, SafeMath usage, function count, entry points

  3. Owner Privileges - Upgradeability, minting, pausability, blacklisting, team accountability

  4. ERC20 Conformity - Return values, metadata, decimals, race conditions, Slither checks

  5. ERC20 Extension Risks - External calls/hooks, transfer fees, rebasing/yield-bearing tokens

  6. Token Scarcity Analysis - Supply distribution, holder concentration, exchange distribution, flash loan/mint risks

  7. Weird ERC20 Patterns (24 patterns including):

    • Reentrant calls (ERC777 hooks)

    • Missing return values (USDT, BNB, OMG)

    • Fee on transfer (STA, PAXG)

    • Balance modifications outside transfers (Ampleforth, Compound)

    • Upgradable tokens (USDC, USDT)

    • Flash mintable (DAI)

    • Blocklists (USDC, USDT)

    • Pausable tokens (BNB, ZIL)

    • Approval race protections (USDT, KNC)

    • Revert on approval/transfer to zero address

    • Revert on zero value approvals/transfers

    • Multiple token addresses

    • Low decimals (USDC: 6, Gemini: 2)

    • High decimals (YAM-V2: 24)

    • transferFrom with src == msg.sender

    • Non-string metadata (MKR)

    • No revert on failure (ZRX, EURS)

    • Revert on large approvals (UNI, COMP)

    • Code injection via token name

    • Unusual permit function (DAI, RAI, GLM)

    • Transfer less than amount (cUSDCv3)

    • ERC-20 native currency representation (Celo, Polygon, zkSync)

    • And more...

  8. Token Integration Safety - Safe transfer patterns, balance verification, allowlists, wrappers, defensive patterns

  9. ERC721 Conformity - Transfer to 0x0, safeTransferFrom, metadata, ownerOf, approval clearing, token ID immutability

  10. ERC721 Common Risks - onERC721Received reentrancy, safe minting, burning approval clearing


Example Output

When analysis is complete, you'll receive a comprehensive report structured as follows:

=== TOKEN INTEGRATION ANALYSIS REPORT ===

Project: MultiToken DEX
Token Analyzed: Custom Reward Token + Integration Safety
Platform: Solidity 0.8.20
Analysis Date: March 15, 2024

---

## EXECUTIVE SUMMARY

Token Type: ERC20 Implementation + Protocol Integrating External Tokens
Overall Risk Level: MEDIUM
Critical Issues: 2
High Issues: 3
Medium Issues: 4

**Top Concerns:**
⚠ Fee-on-transfer tokens not handled correctly
⚠ No validation for missing return values (USDT compatibility)
⚠ Owner can mint unlimited tokens without cap

**Recommendation:** Address critical/high issues before mainnet launch.

---

## 1. GENERAL CONSIDERATIONS

✓ Contract audited by CertiK (June 2023)
✓ Team contactable via [email protected]
✗ No security mailing list for critical announcements

**Risk:** Users won't be notified of critical issues
**Action:** Set up [email protected] mailing list

---

## 2. CONTRACT COMPOSITION

### Complexity Analysis

**Slither human-summary Results:**
- 456 lines of code
- Cyclomatic complexity: Average 6, Max 14 (transferWithFee())
- 12 functions, 8 state variables
- Inheritance depth: 3 (moderate)

✓ Contract complexity is reasonable
⚠ transferWithFee() complexity high (14) - consider splitting

### SafeMath Usage

✓ Using Solidity 0.8.20 (built-in overflow protection)
✓ No unchecked blocks found
✓ All arithmetic operations protected

### Non-Token Functions

**Functions Beyond ERC20:**
- setFeeCollector() - Admin function ✓
- setTransferFee() - Admin function ✓
- withdrawFees() - Admin function ✓
- pause()/unpause() - Emergency functions ✓

⚠ 4 non-token functions (acceptable but adds complexity)

### Address Entry Points

✓ Single contract address
✓ No proxy with multiple entry points
✓ No token migration creating address confusion

**Status:** PASS

---

## 3. OWNER PRIVILEGES

### Upgradeability

⚠ Contract uses TransparentUpgradeableProxy
**Risk:** Owner can change contract logic at any time

**Current Implementation:**
- ProxyAdmin: 0x1234... (2/3 multisig) ✓
- Timelock: None ✗

**Recommendation:** Add 48-hour timelock to all upgrades

### Minting Capabilities

❌ CRITICAL: Unlimited minting
File: contracts/RewardToken.sol:89
```solidity
function mint(address to, uint256 amount) external onlyOwner {
    _mint(to, amount);  // No cap!
}

Risk: Owner can inflate supply arbitrarily Fix: Add maximum supply cap or rate-limited minting

Pausability

✓ Pausable pattern implemented (OpenZeppelin) ✓ Only owner can pause ⚠ Paused state affects all transfers (including existing holders)

Risk: Owner can trap all user funds Mitigation: Use multi-sig for pause function (already implemented ✓)

Blacklisting

✗ No blacklist functionality Assessment: Good - no centralized censorship risk

Team Transparency

✓ Team members public (team.md) ✓ Company registered in Switzerland ✓ Accountable and contactable

Status: ACCEPTABLE


4. ERC20 CONFORMITY

Slither-check-erc Results

Command: slither-check-erc . RewardToken --erc erc20

✓ transfer returns bool ✓ transferFrom returns bool ✓ name, decimals, symbol present ✓ decimals returns uint8 (value: 18) ✓ Race condition mitigated (increaseAllowance/decreaseAllowance)

Status: FULLY COMPLIANT

slither-prop Test Results

Command: slither-prop . --contract RewardToken

Generated 12 properties, all passed: ✓ Transfer doesn't change total supply ✓ Allowance correctly updates ✓ Balance updates match transfer amounts ✓ No balance manipulation possible [... 8 more properties ...]

Echidna fuzzing: 50,000 runs, no violations ✓

Status: EXCELLENT


5. WEIRD TOKEN PATTERN ANALYSIS

Integration Safety Check

Your Protocol Integrates 5 External Tokens:

  1. USDT (0xdac17f9...)

  2. USDC (0xa0b86991...)

  3. DAI (0x6b175474...)

  4. WETH (0xc02aaa39...)

  5. UNI (0x1f9840a8...)

Critical Issues Found

❌ Pattern 7.2: Missing Return Values Found in: USDT integration File: contracts/Vault.sol:156

IERC20(usdt).transferFrom(msg.sender, address(this), amount);
// No return value check! USDT doesn't return bool

Risk: Silent failures on USDT transfers Exploit: User appears to deposit, but no tokens moved Fix: Use OpenZeppelin SafeERC20 wrapper


❌ Pattern 7.3: Fee on Transfer Risk for: Any token with transfer fees File: contracts/Vault.sol:170

uint256 balanceBefore = IERC20(token).balanceOf(address(this));
token.transferFrom(msg.sender, address(this), amount);
shares = amount * exchangeRate;  // WRONG! Should use actual received amount

Risk: Accounting mismatch if token takes fees Exploit: User credited more shares than tokens deposited Fix: Calculate shares from balanceAfter - balanceBefore


Known Non-Standard Token Handling

✓ USDC: Properly handled (SafeERC20, 6 decimals accounted for) ⚠ DAI: permit() function not used (opportunity for gas savings) ✗ USDT: Missing return value not handled (CRITICAL) ✓ WETH: Standard wrapper, properly handled ⚠ UNI: Large approval handling not checked (reverts >= 2^96)


[... Additional sections for remaining analysis categories ...]


For complete report template and deliverables format, see [REPORT_TEMPLATES.md](resources/REPORT_TEMPLATES.md).

---

## Rationalizations (Do Not Skip)

| Rationalization | Why It's Wrong | Required Action |
|-----------------|----------------|-----------------|
| "Token looks standard, ERC20 checks pass" | 20+ weird token patterns exist beyond ERC20 compliance | Check ALL weird token patterns from database (missing return, revert on zero, hooks, etc.) |
| "Slither shows no issues, integration is safe" | Slither detects some patterns, misses integration logic | Complete manual analysis of all 5 token integration criteria |
| "No fee-on-transfer detected, skip that check" | Fee-on-transfer can be owner-controlled or conditional | Test all transfer scenarios, check for conditional fee logic |
| "Balance checks exist, handling is safe" | Balance checks alone don't protect against all weird tokens | Verify safe transfer wrappers, revert handling, approval patterns |
| "Token is deployed by reputable team, assume standard" | Reputation doesn't guarantee standard behavior | Analyze actual code and on-chain behavior, don't trust assumptions |
| "Integration uses OpenZeppelin, must be safe" | OpenZeppelin libraries don't protect against weird external tokens | Verify defensive patterns around all external token calls |
| "Can't run Slither, skipping automated analysis" | Slither provides critical ERC conformance checks | Manually verify all slither-check-erc criteria or document why blocked |
| "This pattern seems fine" | Intuition misses subtle token integration bugs | Systematically check all 20+ weird token patterns with code evidence |

---

## Deliverables

When analysis is complete, I'll provide:

1. **Compliance Checklist** - Checkboxes for all assessment categories
2. **Weird Token Pattern Analysis** - Presence/absence of all 24 patterns with risk levels and evidence
3. **On-chain Analysis Report** (if applicable) - Holder distribution, exchange listings, configuration
4. **Integration Safety Assessment** (if applicable) - Safe transfer usage, defensive patterns, weird token handling
5. **Prioritized Recommendations** - CRITICAL/HIGH/MEDIUM/LOW issues with specific fixes

Complete deliverable templates available in [REPORT_TEMPLATES.md](resources/REPORT_TEMPLATES.md).

---

## Ready to Begin

**What I'll need**:
- Your codebase
- Context: Token implementation or integration?
- Token type: ERC20, ERC721, or both?
- Contract address (if deployed and want on-chain analysis)
- RPC endpoint (if querying on-chain)

Let's analyze your token implementation or integration for security risks!

Files

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Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Security

No issues found by our static scan· No issues found

A static scan is not a guarantee. Skills are third-party content: review a skill before you let an agent use it.

Attribution and licence

Published by
Trail of Bits
Publisher
Trail of Bits (Official)
Source
trailofbits/skills · plugins/building-secure-contracts/skills/token-integration-analyzer · commit e4dd0bb
Licence
Creative Commons Attribution-ShareAlike 4.0 International (redistribution allowed)
  • LICENSE (added by AutoGineer from LICENSE)
  • ATTRIBUTION.md (written by AutoGineer)
Synced

AutoGineer is not affiliated with or endorsed by Trail of Bits.

Download ZIP

The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download token-integration-analyzer.zip