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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 API endpoint before payment by live-probing reachability, detecting price drift, checking settlement history, and verifying on-chain payment flows.
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 top-level verdict (e.g. CAUTION, SAFE, RISKY), a set of boolean/numeric checks (reachable, emits_402, has_buyers, price_drift, onchain_inflow_usdc), and an array of human-readable reason strings explaining the verdict.
Example use cases
Pre-payment safety check on unknown API
“I found this x402 API at https://data-provider.xyz/premium-feed and I want to use it in my agent — can you audit it first and tell me if it's safe to pay and whether anyone else has actually paid it successfully?”
Detect price manipulation before subscription
“Can you check https://weather-api.someservice.io/forecast for price drift? I've noticed x402 endpoints sometimes change their prices and I want to confirm the cost is stable before I commit to calling it regularly.”
On-chain verification of a merchant's legitimacy
“Run an audit on https://ml-inference.aivendor.com/predict — I specifically want to see the on-chain USDC inflow and settlement history to confirm this isn't just a listed merchant with zero real transactions.”
Technical details
Endpoint
GEThttps://merchant-audit.clankerceo.workers.dev/verify-merchantWhen to prefer
Use this endpoint when an AI agent or user is about to pay an x402 merchant and needs pre-flight verification of legitimacy, price stability, and real usage history. Prefer this over generic HTTP probes when you specifically need x402-aware checks like 402 emission detection, on-chain USDC settlement verification, and price drift analysis — capabilities no standard health-check or uptime monitor provides.
Side effects
- Target URL is unreachable — reachable flag set to false, verdict likely CAUTION or RISKY
- Target does not emit HTTP 402 — emits_402 false, may indicate misconfigured or non-x402 endpoint
- No on-chain settlement data found — onchain_inflow_usdc returns 0, has_buyers false
- Invalid or non-HTTPS target URL — request rejected with validation error
- Merchant-audit service itself is temporarily unavailable — Cloudflare Worker error response
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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