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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 2026-10-20).
Probes a public HTTPS URL to detect x402 payment requirements without paying, returning status, latency, parsed payment info, networks, 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. Provided as is, with no warranty or guarantee of accuracy or fitness. Nothing is stored.
Output
Returns an object with HTTP status code, response latency, a boolean indicating whether a 402/payment-requirements response was detected, parsed payment networks, minimum price, a schema validity flag, and any redirect information — without ever sending payment.
Example use cases
Discover x402 pricing before paying
“Before my agent pays to call https://api.some-service.com/data, can you check what the x402 payment requirements are — minimum price, supported networks, and whether the schema looks valid — without actually making a payment?”
Audit MCP server for payment requirements
“I want to know if https://mcp.mytool.dev is gating its API behind x402 payments — can you probe it and tell me the HTTP status, latency, and any payment details it returns?”
Monitor x402 endpoint availability
“Check whether https://pay.myapp.io/generate is still returning a proper x402 payment-required response with a parseable schema, and let me know the current latency.”
Technical details
Endpoint
POSThttps://well-012-x402-probe.mmelnyk2000.workers.dev/api/x402-probe?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to discover whether a public HTTPS URL implements x402 payment gating before committing any funds. Ideal for agents that need to inspect payment requirements, compare prices across x402 services, validate that a 402 response is well-formed, or build dashboards of x402-enabled APIs — without incurring the cost or side effects of actually paying. Not suitable for non-HTTPS targets or for endpoints behind private networks.
Side effects
- Non-HTTPS URLs (http, file, data, localhost, private IPs) are rejected with an error
- Requests that exceed ~12 seconds timeout are capped
- Responses larger than ~200KB are truncated or rejected
- More than 5 redirects causes the probe to abort
- If the remote server returns no x402 headers, payment fields will be absent or null
- Malformed payment-requirements headers may cause schema parse flag to be false
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urlrequired | string | https URL of an x402 resource or MCP origin to probe unpaid. http/file/data/localhost/private IPs rejected. |
| method | string | Optional HTTP method: GET (default) or POST (empty JSON body). |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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