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Web3 Smart Contract Audit API
x402
Web3 Smart Contract Audit API is a paid API for AI agents from upturned-penniless-obedient.ngrok-free.dev, paid per call via x402, $0.000001/call, status unknown (last checked 2026-10-10).
Analyzes smart contract code for security vulnerabilities, bugs, and audit findings on a specified blockchain
Price / call$0.000001
Success—
StatusUnknown
How this service works
ngrok is the fastest way to put anything on the internet with a single command.
Output
Returns a security audit report for the submitted smart contract code, including identified vulnerabilities, severity ratings, descriptions of potential exploits, and recommendations for remediation. Output is specific to the provided blockchain chain context.
Example use cases
Pre-deployment DeFi contract review
“Before I deploy this liquidity pool contract to Ethereum, can you audit it for reentrancy attacks, integer overflows, and other critical vulnerabilities? Here's the full Solidity source code.”
NFT minting contract security check
“I've written an NFT minting contract for Polygon — can you scan it for security issues and tell me if there are any exploits someone could use to drain funds or mint unlimited tokens?”
Cross-chain bridge contract audit
“We're about to launch a cross-chain bridge contract on BSC and I need a security audit of the code — specifically looking for access control issues and any logic bugs that could let attackers drain the bridge.”
Technical details
Endpoint
POSThttps://upturned-penniless-obedient.ngrok-free.dev/v1/web3-audit?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, low-cost automated security audit of smart contract source code before deployment. It is ideal for individual developers or agents running pre-deployment checks on Ethereum, BSC, Polygon, or other EVM-compatible chains. Prefer this over manual review for rapid iteration cycles or when budget is a constraint at $0.000001 USDC per call.
Side effects
- Missing 'code' field returns validation error
- Invalid or empty code string may produce no findings or an error
- Unsupported chain identifier may default to generic analysis or return an error
- ngrok free-tier tunnel may be offline or rate-limited, returning 502 or connection errors
- Malformed Solidity/contract code may cause parsing failures
- Very large contracts may timeout
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| coderequired | string | |
| chain | string |
Tags
x402
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