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Listing Doctor — x402 Endpoint Diagnostics
x402
Listing Doctor — x402 Endpoint Diagnostics is a paid API for AI agents from listing-doctor.node01.org, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-27).
Diagnoses x402 paid endpoint listings by checking the 402 challenge, payment headers, resource URL, Bazaar extension, price/asset/network/payTo fields, and discovery catalog inclusion, then returns a concrete verdict with failing checks and fixes.
Price / call$0.05
Success—
StatusUnknown
How this service works
Send your endpoint URL. It checks the unpaid 402 challenge, the PAYMENT-REQUIRED header, the declared resource URL, the Bazaar extension, the price/asset/network/payTo fields and the discovery catalog, then returns a concrete diagnosis with the failing checks and the fix.
Output
A JSON object containing a map of individual check results (e.g. is_402, reachable, in_payai_catalog), the target URL that was diagnosed, a human-readable verdict string describing the overall status (e.g. 'PAYABLE-NOT-INDEXED'), and a timestamp of when the diagnosis was performed. Failing checks are highlighted so the developer knows exactly what to fix.
Example use cases
Debug missing catalog entry
“My x402 endpoint at https://myapi.example.com/api/generate isn't showing up in x402scan or Bazaar — can you diagnose it and tell me what's wrong with the listing?”
Validate payment header configuration
“I just deployed a new paid API at https://myservice.io/api/v1/inference — can you check whether the PAYMENT-REQUIRED header, price, asset, network, and payTo fields are all set up correctly for x402?”
Pre-launch x402 compliance check
“Before I submit my endpoint https://payments.myapp.dev/api/search to the Bazaar directory, can you run a full x402 diagnosis and tell me if anything will cause it to fail validation?”
Technical details
Endpoint
GEThttps://listing-doctor.node01.org/api/listing-doctor?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to debug why an x402-compliant paid API endpoint is not discoverable, not paying out correctly, or failing validation checks. It is the go-to diagnostic tool specifically for x402 protocol compliance and Bazaar/x402scan catalog discovery issues, rather than general HTTP debugging or non-x402 payment systems.
Side effects
- Target URL is unreachable or times out — diagnosis cannot be completed
- Target URL does not return a 402 status — is_402 check fails
- Malformed or missing input URL parameter — returns validation error
- Target endpoint blocks the diagnostic probe — partial results returned
- Catalog indexer not yet updated — in_payai_catalog may show false even for valid endpoints
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | URL of the x402 endpoint to diagnose |
Output
Schema · Response
{
"type": "json",
"example": {
"checks": {
"is_402": true,
"reachable": true,
"in_payai_catalog": false
},
"target": "https://example.com/api/pay",
"verdict": "PAYABLE-NOT-INDEXED (pay, then wait for indexer)",
"diagnosed_at": "2026-10-08T02:10:00Z"
}
}Tags
x402
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