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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 it, checking settlement history, price drift, and on-chain USDC inflow.
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), a set of boolean checks (reachable, emits_402, has_buyers, price_drift) and a numeric on-chain USDC inflow figure, plus a human-readable list of reasons explaining the verdict.
Example use cases
Pre-payment safety check
“I'm about to send USDC to this x402 endpoint at https://inference-api.example.com/v1/generate — can you audit it first and tell me if it's safe to pay, has real buyers, and whether the price has been drifting?”
Detecting ghost listings
“Can you check whether https://data-feed.somesite.io/premium has actually had any settlements in the last 30 days or if it's just listed with no real activity? I don't want to pay for a dead endpoint.”
On-chain verification of a new merchant
“I found this paid API at https://new-merchant.xyz/api/weather — can you verify it's actually a legitimate x402 merchant by checking its on-chain USDC inflow and whether it correctly returns 402 responses?”
Technical details
Endpoint
GEThttps://merchant-audit.clankerceo.workers.dev/x402-endpoint-verifyWhen to prefer
Use this endpoint whenever an AI agent is about to make a payment to an unknown or untrusted x402 merchant URL and needs a safety check first. It is specifically designed for the x402 HTTP payment protocol and provides on-chain verification that generic URL checkers or uptime monitors cannot offer. Prefer this over manual inspection when you need settlement history, price drift detection, and on-chain USDC data in a single call.
Side effects
- Target URL is unreachable or returns non-402 errors — reachable flag set to false
- Merchant has no on-chain settlement history — has_buyers false, verdict may be CAUTION
- Price drift detected — price_drift flag true and flagged in reasons
- Invalid or non-HTTPS target URL provided — request rejected
- Target is reachable but never emits 402 — emits_402 false, likely not a valid x402 endpoint
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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