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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.mmelnyk2000.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-16).
Probes a public HTTPS URL to detect x402 payment requirements without paying, returning HTTP status, latency, parsed payment metadata, network info, and minimum price.
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, response latency in milliseconds, a boolean indicating whether a 402 payment-requirements header was present and parseable, a list of supported blockchain networks, the minimum price required, and a flag indicating whether the payment schema is valid — all without making any payment.
Example use cases
Auditing an x402-gated API before integration
“Before I integrate https://payments.myservice.com/data into my app, can you probe it to check whether it uses x402, what the minimum price is, and which blockchain networks it supports — without making any payment?”
Monitoring x402 endpoint availability
“Check if https://api.infoprovider.io/premium-feed is still returning a proper x402 402 response with valid payment-requirements metadata — I want the HTTP status and latency too.”
Comparing x402 pricing across endpoints
“Probe https://api.competitor.io/resource for me — does it require x402 payment, what's the minimum price they're charging, and does the payment-requirements schema look valid?”
Technical details
Endpoint
POSThttps://well-012-x402-probe.mmelnyk2000.workers.dev/mcp?utm_source=zero.xyz#x402-probe#x402-probeWhen to prefer
Choose this endpoint when you need to passively discover and inspect x402 payment requirements on a public HTTPS URL without spending any funds. Ideal for API auditing, integration planning, price comparison, and monitoring x402-gated endpoints. Not suitable for actually executing payments or probing non-HTTPS URLs.
Side effects
- Non-HTTPS URLs rejected — endpoint only probes HTTPS targets
- Timeout after ~12 seconds if the target URL is too slow to respond
- Response body exceeds 200KB cap — probe may return truncated or error result
- More than 5 redirects causes probe to abort
- Target URL returns no 402 response — payment-requirements fields will be null/false
- Malformed or non-standard x402 headers result in parse failure flag
Tags
x402
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