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x402 Endpoint Health & Payment Parameter Vetter
x402
x402 Endpoint Health & Payment Parameter Vetter is a paid API for AI agents from api.fadeandco.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).
Probes a public HTTPS endpoint for x402 payment challenge details (networks, asset, price, pay-to address, CORS) without making a payment
Price / call$0.002
Success—
StatusUnknown
How this service works
Checks an x402 (HTTP 402 payment) endpoint before you pay: one unpaid GET, then the HTTP status, whether a 402 challenge with an accepts list is present, the payment networks, asset, price and pay-to address format, CORS header and response time. Does not pay, does not verify the seller's identity or reputation, and gives one sample, not uptime.
Output
Returns a JSON object with: the URL checked, HTTP status code, a verdict string (e.g. '402_WITHOUT_X402_ACCEPTS' or valid x402), list of accepted payment networks, asset, price, pay-to address format, CORS allow-origin header value, response time in milliseconds, number of accepts, and a timestamp. Explicitly notes this is one unpaid sample and says nothing about uptime or seller identity.
Example use cases
Pre-flight check before paying an API
“I want to call https://api.someservice.com/data but I think it requires a payment — can you probe it and tell me what asset and price it expects, which networks it accepts, and how fast it responds, without actually paying?”
Validating x402 configuration of a new endpoint
“I just deployed my x402-gated endpoint at https://mypaywall.workers.dev/api/report — can you check whether the 402 challenge is properly formed, what networks and assets are listed, and if CORS is set up correctly?”
Comparing payment terms across a vendor's endpoint
“Can you inspect https://vendor.io/api/premium and tell me the exact price, asset, and pay-to address it advertises in its x402 challenge, plus how many milliseconds it takes to respond?”
Technical details
Endpoint
GEThttps://api.fadeandco.workers.dev/api/agent-intel/x402-endpoint-health-vetting?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to inspect an x402-gated URL's payment parameters before committing funds — specifically to see which blockchain networks and assets are accepted, the price, the pay-to address format, and CORS configuration. Prefer it over manually reading 402 headers when you want a structured, parsed summary. Not suitable for verifying seller reputation, testing endpoint uptime, or actually executing a payment.
Side effects
- Non-HTTPS or unreachable URLs return an error or null first-response
- Endpoints that don't return 402 at all yield a non-x402 verdict
- Endpoints with a 402 but no valid x402 accepts list yield '402_WITHOUT_X402_ACCEPTS' verdict
- Network timeouts may produce null response fields
- No payment is attempted so paywalled response bodies are not validated
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://httpbin.org/status/402",
"note": "One unpaid request. Says nothing about uptime, seller identity or reputation.",
"first": null,
"source": "https://httpbin.org/status/402",
"verdict": "402_WITHOUT_X402_ACCEPTS",
"networks": [],
"checkedAt": "2026-10-23T09:35:20.497Z",
"httpStatus": 402,
"responseMs": 816,
"acceptsCount": 0,
"corsAllowOrigin": "*"
}
}Tags
x402
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