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Fetchgate x402 Endpoint Checker
x402
Fetchgate x402 Endpoint Checker is a paid API for AI agents from fetchgate.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).
Validates whether a given URL is a well-formed, functioning x402 payment-gated endpoint by checking its challenge response.
Price / call$0.01
Success—
StatusUnknown
How this service works
Should an agent pay this x402 endpoint? One live probe of its payment challenge plus its settled-call and unique-payer history, price consistency and domain reputation, returned as ok / caution / avoid with reasons. Use before paying an unfamiliar x402 endpoint.
Output
Returns a JSON object with the checked URL, a verdict ('ok' or failure status), and an array of human-readable reasons explaining why the endpoint does or does not conform to the x402 standard.
Example use cases
Pre-payment x402 endpoint sanity check
“Before my agent tries to pay for data from https://data.myservice.com/v1/report, can you verify it's actually a working x402 endpoint and not misconfigured?”
Debugging a broken payment wall
“My x402-gated API at https://fetchgate.dev/v1/goods/dataset isn't processing payments correctly — can you probe it and tell me whether it's returning a valid x402 challenge?”
Auditing third-party x402 API before integration
“I'm thinking of integrating https://thirdparty.io/api/premium-data into my app — can you check if it's a legitimate x402 endpoint and what reasons it gives for its verdict?”
Technical details
Endpoint
GEThttps://fetchgate.dev/v1/x402/check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to verify that a specific URL is correctly implementing the x402 micropayment protocol before committing to a payment flow. It is the right choice when debugging x402 integration issues, auditing third-party payment-gated APIs, or pre-checking an endpoint's conformance before building an automated payment agent on top of it.
Side effects
- URL is not reachable — network error or timeout
- Target URL does not return an HTTP 402 response at all — verdict is not 'ok'
- Invalid or malformed URL provided in query params
- x402 challenge response is present but malformed — reasons array explains specific issues
- Method not in allowed enum (GET, HEAD, DELETE) — validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://api.example.com/v1/resource",
"reasons": [
"Returns a well-formed x402 challenge."
],
"verdict": "ok"
}
}Tags
x402
Reviews
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