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Oblique Markets x402 Endpoint Verifier
x402
Oblique Markets x402 Endpoint Verifier is a paid API for AI agents from api.oblique.markets, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Probes a third-party URL to confirm it returns a well-formed HTTP 402 challenge and reports x402 protocol-conformance findings including accepts[] completeness, CDP Base price floor, header/body consistency, and timeout sanity.
Price / call$0.02
Success—
StatusUnknown
How this service works
Use when an agent needs x402 endpoint verify. Returns Verify and lint a third-party x402 endpoint: probes the URL (SSRF-guarded), confirms it answers with a well-formed HTTP 402 challenge, and reports protocol-conformance findings — accepts[] completeness, facilitator price floor on Base, PAYMENT-REQUIRED header/body consistency, timeout sanity. $0.02.
Output
Returns a structured conformance report indicating whether the probed URL returns a valid HTTP 402 challenge, with specific findings on: accepts[] array completeness, CDP Base price floor adequacy, PAYMENT-REQUIRED header/body consistency, timeout sanity, and overall protocol compliance pass/fail status. SSRF-guard checks are applied before probing.
Example use cases
Pre-launch x402 compliance check
“Before I list my API on agentic.market, can you verify my x402 endpoint at https://api.myproject.com/v1/premium/data is fully protocol-compliant — especially whether the accepts[] array covers all required payment methods and the 402 response body matches the headers?”
Debugging a rejected payment endpoint
“My x402 endpoint at https://api.myservice.io/paid/results keeps getting rejected by facilitators — can you probe it and tell me exactly which conformance issues are causing the problem, like missing accepts[] entries or header/body mismatches?”
Auditing a third-party x402 API before integration
“I'm thinking about integrating a third-party paid API at https://data.vendor.xyz/api/v2/feed — can you lint their x402 endpoint and tell me if their 402 challenge is well-formed, their CDP Base price floor is reasonable, and their timeout is sane before I build against it?”
Technical details
Endpoint
POSThttps://api.oblique.markets/api/v1/paid/x402-endpoint-verifyWhen to prefer
Use this endpoint when you need to validate that a specific URL correctly implements the x402 payment protocol before listing it on a facilitator or integrating it into an agentic payment flow. It is purpose-built for x402 conformance — covering accepts[] completeness, CDP Base price floor, header/body consistency, and timeout sanity — rather than generic HTTP testing or API health checks.
Side effects
- URL is blocked by SSRF guard (private/internal IP ranges rejected)
- Target endpoint does not respond with HTTP 402 at all
- Target endpoint is unreachable or times out during probe
- Malformed or incomplete 402 response body prevents conformance analysis
- accepts[] array is empty or missing required payment network entries
- CDP Base price floor is absent or below minimum threshold
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | The https URL of the x402 endpoint to verify |
| method | string | HTTP method the endpoint sells on |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://api.example-seller.com/api/v1/paid/quote",
"method": "GET",
"is_x402": true,
"findings": [
"accepts[1] amount 500 is below the CDP facilitator floor of 1079 atomic on eip155:8453 — unsellable through the main facilitator",
"PAYMENT-REQUIRED header is absent — x402 v2 clients that read the header instead of the body will not see the challenge"
],
"reachable": true,
"checked_at": "2026-08-10T12:00:00.000Z",
"http_status": 402,
"x402_version": 2,
"accepts_count": 2
}
}Tags
x402
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