Free Smart Contract Audit
SmartContract.us offers one free AI-powered smart contract security audit per day — no account, no credit card, no signup required. Enter any verified contract address, select your chain, and receive a comprehensive security report in under 60 seconds.
What the free audit includes
Every free audit runs the same analysis pipeline as our Pro tier:
- Vulnerability detection: Checks for reentrancy, access control flaws, integer overflow/underflow, unchecked return values, tx.origin authentication, flash loan attack vectors, and 80+ other patterns.
- Trust Score: A 0–100 security score based on weighted sub-scores across code security, access control, economic risk, and operational risk.
- Risk verdict: LOW / MEDIUM / HIGH / CRITICAL risk rating with a deploy-readiness assessment.
- Findings with severity: Each vulnerability with its severity (Critical to Informational), description, impact, and recommended fix.
- Gas analysis: Efficiency rating and optimization suggestions.
- Investor summary: Rug pull risk assessment and key risk factors.
Supported chains
- Ethereum (ETH)
- Polygon (MATIC)
- Arbitrum (ARB)
- Base
- BNB Chain (BSC)
Free vs Pro
| Feature | Free (Guest) | Pro ($59/month) |
|---|---|---|
| Contract audits per day | 1 | 20 |
| Code scans per day | 1 | 20 |
| Transaction simulation | 1/day | 20/day |
| Account required | No | Yes |
| Audit history | No | Yes (full history) |
| Shareable audit URLs | No | Yes |
| Portfolio monitoring | No | Yes (24-hour alerts) |
| Incident response playbook | No | Yes |
| PDF export | No | Yes |
| Rekt Test | 1/day | Unlimited |
How the free audit works
- Navigate to SmartContract.us.
- Enter a verified contract address in the address field.
- Select the chain from the dropdown (Ethereum, Polygon, Arbitrum, Base, or BNB Chain).
- Click "Analyze" and wait approximately 30–60 seconds.
- Review your full security report — no login required.
Why the free tier exists
We believe that basic smart contract security analysis should be accessible to every developer and investor — not just those who can afford $50,000 audits. Our free tier lets you:
- Check any contract before interacting with it.
- Run a quick security sanity check on contracts you're considering investing in.
- Get a security report as a developer before deciding whether a formal audit is needed.
Is a free AI audit enough?
A free AI audit is an excellent starting point and is often sufficient for:
- Developer security checks during development.
- Investor due diligence before depositing funds into a DeFi protocol.
- Contracts holding low-to-moderate value (under $100,000).
For production contracts handling significant user funds, a professional manual audit from a reputable firm (Trail of Bits, OpenZeppelin, Certik) is recommended in addition to AI analysis. See our AI vs Manual Audit comparison for details.
Try it now — completely free
No account required. Enter a contract address and get results in under 60 seconds.
Run Free Audit →