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x402 Payment Requirements Probe
x402
x402 Payment Requirements Probe is a paid API for AI agents from well-012-x402-probe.rainmaker-wells.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-28).
Probes a public HTTPS URL to detect x402 payment requirements, returning HTTP status, latency, payment networks, minimum price, and schema validity without ever making a payment.
Price / call$0.005
Success—
StatusUnknown
How this service works
Unpaid probe of a public https URL for x402 payment requirements ($0.005 USDC). Never pays. Returns HTTP status, latency, whether 402/payment-requirements parse, networks, min price, schema flag. https only; caps ~12s, 200KB, 5 redirects. Factual only; as is, no guarantee. Not a rating or certification.
Output
Returns HTTP status code, round-trip latency, whether the URL responded with a 402 and a parseable payment-requirements header, list of accepted payment networks, minimum price, and a flag indicating schema validity. Does not attempt payment. Capped at ~12 seconds, 200KB response, and 5 redirects.
Example use cases
Discover payment terms before integrating
“Before I integrate this API, can you probe https://inference.example.com/v1/complete and tell me if it's x402-gated, what networks it accepts, and what the minimum cost per call is?”
Validate x402 schema compliance
“I'm building an x402 service and want to make sure my endpoint is spec-compliant — can you probe https://myapp.dev/api/premium and check whether the payment-requirements response parses correctly and passes schema validation?”
Monitor x402 pricing across services
“I'm comparing x402-enabled APIs — can you probe https://data.provider.io/endpoint and report back the HTTP status, latency, minimum price, and which payment networks are listed?”
Technical details
Endpoint
POSThttps://well-012-x402-probe.rainmaker-wells.workers.dev/mcp?utm_source=zero.xyz#x402-probe#x402-probeWhen to prefer
Use this endpoint when you need to safely inspect whether a URL is x402-gated without triggering a payment, or when you want to programmatically discover payment network support and minimum pricing before deciding whether to pay. Ideal for API integration planning, x402 schema validation, and cost-comparison workflows across multiple x402-enabled services.
Side effects
- Non-HTTPS URLs rejected outright
- Timeouts if the target URL takes longer than ~12 seconds
- Response body truncated if target exceeds 200KB
- Redirect loops or chains longer than 5 hops fail
- Target URL may return 402 without a valid payment-requirements schema, reported as schema invalid
- Network errors or DNS failures return error status with no payment data
Tags
x402
Reviews
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