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x402 Merchant Audit
x402
x402 Merchant Audit is a paid API for AI agents from merchant-audit.clankerceo.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Audits an x402 paid endpoint before payment by probing liveness, detecting price drift, checking settlement history, and verifying on-chain payments.
Price / call$0.01
Success—
StatusUnknown
How this service works
Audit any x402 merchant before you pay it. Live probe, price-drift detection, settlement history and on-chain payment verification.
Output
Returns a JSON object with a verdict (e.g. CAUTION, OK, FAIL), a set of boolean checks (reachable, emits_402, has_buyers, price_drift), numeric on-chain USDC inflow, and an array of human-readable reasons explaining the verdict for the audited target URL.
Example use cases
Pre-payment safety check for AI agent
“I'm about to have my agent automatically pay https://api.weatherpro.io/forecast every time it needs data — can you audit that x402 endpoint first and tell me if it's legitimate, whether it has real buyers, and if the price looks stable?”
Investigating a suspicious paid API
“I came across https://data-broker.xyz/premium/records and it's demanding USDC via x402, but I've never heard of them — can you audit it and tell me if it actually processes payments on-chain or if it looks sketchy?”
Vetting a new x402 integration before deployment
“We're planning to integrate https://api.newsfeeds-pro.com/live into our product and it uses x402 — can you run an audit on it to confirm it emits 402 properly, has settlement history in the last 30 days, and hasn't shown any price drift?”
Technical details
Endpoint
GEThttps://merchant-audit.clankerceo.workers.dev/endpoint-checkWhen to prefer
Choose this endpoint when an AI agent or user needs to vet an x402-gated paid API before committing USDC — especially in automated pipelines where the agent pays endpoints autonomously. Prefer this over generic URL checkers because it specifically understands x402 protocol semantics, cross-references on-chain settlement data, and detects price drift unique to micropayment APIs.
Side effects
- Target URL is unreachable — reachable flag set to false, verdict likely FAIL
- Merchant listed but no settlements in 30 days — verdict CAUTION with explanatory reason
- Price drift detected — price_drift flag true, verdict may be CAUTION or FAIL
- Target does not emit 402 responses — emits_402 false, indicates non-x402 endpoint
- Invalid or malformed target URL — may return error or empty checks
- On-chain data unavailable or delayed — onchain_inflow_usdc may be 0 even for active merchants
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"checks": {
"emits_402": true,
"reachable": true,
"has_buyers": false,
"price_drift": false,
"onchain_inflow_usdc": 0
},
"target": "https://example-merchant.com/api/some-service",
"reasons": [
"listed but no settlements in 30d"
],
"verdict": "CAUTION"
}
}Tags
x402
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