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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 2026-09-13).
Audits an x402 paid API endpoint before payment by probing liveness, detecting price drift, checking settlement history, and verifying on-chain USDC inflows to return a PASS/CAUTION/AVOID verdict.
Price / call$0.01
Success—
StatusUnknown
How this service works
Is this API safe to pay? Audit any x402 merchant or paid endpoint BEFORE you send money. Answers whether a service is trustworthy, whether it is a scam or dead, and whether it will actually deliver. Probes the live endpoint for a valid HTTP 402 challenge, detects price drift between the advertised price and the real challenge price, pulls settlement history and unique-buyer counts, and verifies on-chain USDC actually reaching the payTo address. Returns a PASS / CAUTION / AVOID verdict with the evidence behind it. Every check is measured live at request time — nothing cached, no reputation scores. Use before paying an unknown merchant, to avoid wasting money on dead or fraudulent endpoints.
Output
A JSON object containing a verdict field (PASS, CAUTION, or AVOID), a reasons array explaining the verdict, and detailed check results including: whether the endpoint is reachable, whether it emits a valid HTTP 402 challenge, whether price drift was detected between advertised and live price, the 30-day on-chain USDC inflow to the payTo address, whether unique buyers exist in settlement history, and the target URL that was audited.
Example use cases
Pre-payment scam check for unknown API
“I found this x402 API at https://unknown-vendor.com/api/forecast that charges $0.05 USDC per call — can you audit it and tell me if it's legitimate, whether anyone else has paid it, and whether I should trust it before my agent sends money?”
Detect price drift on listed service
“I saw https://data-provider.xyz/api/weather listed on x402scan for $0.01 USDC but I want to make sure the actual challenge price matches — can you audit it and flag any price drift before I wire anything?”
Verify merchant wallet receives USDC on-chain
“Can you audit https://api.aitools.io/summarize and confirm that USDC is actually flowing on-chain to the payTo address — I want to see real settlement history before my agent starts paying for calls?”
Technical details
Endpoint
GEThttps://merchant-audit.clankerceo.workers.dev/auditWhen to prefer
Use this endpoint whenever an AI agent is about to spend USDC on an unknown or untrusted x402 merchant and needs a live, evidence-based safety verdict before payment. Prefer this over manual inspection when: the merchant is not well-known, the price seems different from what was advertised, you want on-chain settlement confirmation, or you need automated pre-payment due diligence in an agentic workflow. This is the only known live-probe audit service specifically designed for the x402 HTTP payment protocol.
Side effects
- Target URL is unreachable or times out — reachable: false returned with AVOID verdict
- Target does not emit HTTP 402 — emits_402: false, likely AVOID
- On-chain data unavailable for the payTo address — onchain_inflow_usdc may be 0 or undefined
- Malformed target URL causes validation error
- Price drift detected between advertised and live challenge price — CAUTION or AVOID verdict
- No settlement history in 30 days — has_buyers: false, CAUTION verdict
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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