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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, $2/call, status unknown (last checked 2026-09-15).
Live-probes an x402 paid API endpoint to audit its reachability, price drift, settlement history, and on-chain USDC payment verification before you pay it.
Price / call$2
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 and numeric checks (reachable, emits_402, has_buyers, price_drift, onchain_inflow_usdc), and a human-readable list of reasons explaining the verdict for the target x402 URL.
Example use cases
Pre-payment safety check for unknown API
“I found an x402 API at https://unknown-data-vendor.com/api/premium — before I pay anything, can you audit it and tell me if it's safe, whether it actually emits 402, and if there's any real settlement history?”
Detecting abandoned x402 listings
“Can you check https://old-project.io/api/feed to see if it's still active and has had any buyers in the last 30 days? I don't want to pay for a dead endpoint.”
On-chain verification before agent automation
“My agent is about to start auto-paying https://ai-service.xyz/generate for each request — first, audit that merchant to confirm real USDC has flowed to it on-chain and that the price hasn't been drifting.”
Technical details
Endpoint
GEThttps://merchant-audit.clankerceo.workers.dev/datasetWhen to prefer
Use this endpoint whenever an AI agent is about to make an x402 micropayment to an unfamiliar or untrusted endpoint, or when you want to validate that a listed x402 resource is live, has real buyers, and hasn't changed its price unexpectedly. Prefer this over manual inspection when you need on-chain settlement evidence and a structured PASS/CAUTION/FAIL verdict rather than a raw HTTP probe.
Side effects
- Target URL is not an x402 endpoint — returns emits_402: false and likely a CAUTION or FAIL verdict
- Target host is unreachable — reachable: false in checks
- No settlement data found in 30 days — verdict CAUTION with reason 'listed but no settlements in 30d'
- Invalid or missing target query parameter — request fails with schema validation error
- On-chain data temporarily unavailable — 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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