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Council of AI x402 Conformance Checker
x402
Council of AI x402 Conformance Checker is a paid API for AI agents from councilof.ai, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-02).
Checks whether a given public HTTPS URL correctly implements the x402 payment protocol and returns a signed conformance receipt
Price / call$0.02
Success—
StatusUnknown
How this service works
We measure how AI systems behave against frozen, published tests and publish checkable evidence. Issued measurement cards are signed; unsigned supporting runs are labelled. Read the live board and corrections ledger.
Output
A JSON object with a 'kind' of 'receipt', containing a 'result' block that includes the HTTP status code, whether the endpoint is conformant, the x402 version detected, presence of the payment-required header, and whether the bazaar extension block is present. Also includes a 'state' field (CONFORMANT, NOT_CONFORMANT, or UNREACHABLE), the schema version, and a cryptographic receipt with a SHA-256 hash and optional ed25519 signature.
Example use cases
Pre-launch x402 compliance audit
“I'm about to launch my paid API at https://data.myservice.com/feed — can you run an x402 conformance check on it and tell me whether it's fully compliant, including whether it has the bazaar extension and the right headers?”
Third-party proof of x402 compliance
“I need independent, signed proof that https://api.partner.com/reports is a conformant x402 endpoint — can you fetch a signed receipt from Council of AI so I can share it with my stakeholders?”
Debugging a broken x402 endpoint
“My endpoint at https://api.acme.io/premium/data is returning 402 but buyers say payments aren't working — can you run an x402 conformance check on it so I can see exactly which parts of the spec it's failing?”
Technical details
Endpoint
GEThttps://councilof.ai/api/ras/x402-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need independent, cryptographically signed third-party verification that a specific public HTTPS URL correctly implements the x402 payment protocol per version 2 of the spec. Prefer this over manual inspection when you need a checkable, publishable conformance receipt — especially for auditing partner APIs, validating your own implementation before launch, or debugging x402 compliance failures.
Side effects
- URL is unreachable or times out — state returned as UNREACHABLE
- URL does not return HTTP 402 — conformant field is false
- Missing PAYMENT-REQUIRED response header — conformant field is false
- x402Version in body is not 2 — conformant field is false
- Missing extensions.bazaar block — conformant field is false
- Non-HTTPS URL provided — rejected by input schema validation
- Receipt may be unsigned (sig_ed25519 null) for supporting runs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"kind": "receipt",
"result": {
"row": {
"status": 402,
"conformant": true,
"x402_version": 2,
"has_bazaar_extension": true,
"payment_required_header": true
},
"kind": "csoai.ras.x402-check/0.1",
"rule": "Conformant = HTTP 402 AND a PAYMENT-REQUIRED response header AND x402Version 2 in the body AND an extensions.bazaar block.",
"state": "CONFORMANT | NOT_CONFORMANT | UNREACHABLE"
},
"schema": "csoai.ras.x402-check/0.1",
"receipt": {
"sha256": "<hex>",
"sig_ed25519": "<hex or null>"
}
}
}Tags
x402
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