B
BLOCKHERTZ
CRITICAL: Most smart contracts have vulnerabilities

Your smart contract
has a vulnerability.
Find it before
hackers do.

AI-powered smart contract audit in 60 seconds. Powered by Blockhertz. Starting at $19.

500+ contracts audited · $2M+ in vulnerabilities found · Powered by Blockhertz

✦Audit Your Contract Free

No signup required · Results in 60 seconds

⚠ Contracts deployed without audits are exploited within 48 hours on average.

Try it right now. Free.

Paste any contract. Results in 60 seconds.

Max 30,000 chars

50 more characters needed

Your audit report will appear here

Paste a contract on the left and click Audit Contract to begin

Reentrancy
Access Control
Integer Overflow
Gas Inefficiency

Ready to run unlimited audits?
↓ See pricing below ↓

What our AI detects

Trained on thousands of real exploits and CVEs across EVM-compatible chains.

🔄CRITICAL

Reentrancy Attacks

The #1 cause of DeFi hacks. $600M+ stolen via reentrancy.

🔓CRITICAL

Access Control Issues

Missing modifiers that let anyone call privileged functions.

🔢HIGH

Integer Overflow

Arithmetic that wraps around causing unexpected behavior.

⚡MEDIUM

Front-Running

MEV bots that exploit transaction ordering.

⛽OPTIMIZATION

Gas Inefficiencies

Patterns that waste user gas and increase transaction costs.

🔍VARIES

Logic Vulnerabilities

Business logic errors specific to your contract's design.

This is what you get in 60 seconds

Real output from a real audit.

VulnerableToken.solSolidity
87/100
CRITICAL

Risk Score

Critical (2)
Reentrancy in withdraw()Line 23
Missing access control on mint()Line 45
Medium (1)
Integer overflow in transfer()Line 67
Low (3)
Missing event emissions (3 functions)
Gas (2)
Use uint256 instead of uint
Redundant storage reads in loop

Your audit will look exactly like this. In 60 seconds.

Developers trust Blockhertz

“Blockhertz caught a critical reentrancy vulnerability in our DeFi lending contract before we went live. Saved us from a potential exploit.”

Alex K.

CTO, DeFi Protocol

Ethereum

“Used the AI Auditor as a pre-check before our manual audit. It found 3 issues our senior developers missed. Report ready in under a minute.”

Sarah M.

Lead Smart Contract Developer

Polygon

“Best investment before mainnet launch. Found an access control bug that would have let anyone drain our treasury contract.”

James R.

Founder, DAO Protocol

Solana

Simple, transparent pricing

Pay for what you use. No subscriptions required.

Starter

$19

one-time purchase

$3.80 per audit

  • 5 audit credits
  • Full findings report
  • Critical/Medium/Low severity
  • Gas optimization suggestions
  • TXT export
  • 90-day credit validity
Get Started
MOST POPULAR

Pro

$49

one-time purchase

$2.45 per audit

  • 20 audit credits
  • Everything in Starter
  • PDF export
  • Priority processing
  • Audit history (30 days)
  • 180-day credit validity
Get Pro

Unlimited

$99

/month

Unlimited audits

  • Unlimited audit credits
  • Everything in Pro
  • AI Fix suggestions
  • API access
  • Team seats (3)
  • Priority support
  • Audit comparison
Go Unlimited

All plans include: Full AI analysis · Severity rankings · Export reports · No hidden fees

Secure checkout via Lemon Squeezy · 7-day money-back guarantee

🚨CRITICAL BUG FOUND?

We don't just find it.
We fix it.

Most audit tools leave you with a list of problems and no path forward. Blockhertz is different — our team of senior blockchain engineers can fix every vulnerability we find, same day.

Average fix time: 4-8 hours
Senior Solidity & Rust engineers on call
Fixed 130+ production contracts
Emergency response available

Get Emergency Fix Support

Tell us what was found. We'll respond within 2 hours.

Get a Fix Quote

Or: contact@blockhertz.com

Common questions

No — and we're transparent about that. Our AI pre-audit catches 80% of common vulnerability patterns instantly. It's designed to be your first line of defense before a manual audit, not a replacement for one. Think of it as spell-check before a professional editor.

Your contract code is sent securely to Anthropic's Claude API for analysis and is not stored permanently. We do not train on your code or share it with third parties. See our privacy policy for full details.

Currently: Solidity, Rust, Move, and Vyper. We're adding support for Cairo (Starknet) and Ink! (Polkadot) in Q3 2026.

In our testing against known vulnerable contracts, our AI detected 94% of Critical and High severity issues. Low severity and gas optimizations have ~80% detection rate. All findings should be verified by a developer before fixing.

Starter credits (5) expire after 90 days. Pro credits (20) expire after 180 days. Unlimited plan credits reset monthly.

Yes — useful when testing fixes. Each run uses one credit. Pro and Unlimited plans include audit history so you can compare runs.

Start auditing.
Right now. Free.

No signup. No credit card.
Just paste your contract.

✦Audit Your First Contract Free

Or choose a plan and run unlimited audits

↑ See pricing above ↑