Tool detail

x402 Doctor

Diagnoses why a given x402 payment endpoint or MCP server is failing: checks the 402 challenge, payment options, and discovery surfaces, read-only.

Categories: API testing

Use when

debug why an x402 endpoint's payments are failing before integrating it
check whether an x402 endpoint is reachable and payable without paying it

Not for

never pays the diagnosed endpoint -- read-only checks only

Inputs

GET query params: url (string, required, the x402 endpoint to diagnose); method (enum GET|POST, optional, default tries GET then POST)

Admitted input schema

{
  "type": "object",
  "properties": {
    "method": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "enum": [
        "GET",
        "POST"
      ],
      "description": "HTTP method of the endpoint. Default: try GET, then POST."
    },
    "url": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "The x402 endpoint to diagnose (public http(s) URL)."
    }
  },
  "required": [
    "url"
  ],
  "additionalProperties": false
}

Endpoint

Method: GET
URL: https://x402-doctor.onrender.com/api/v1/diagnose

Payment

Protocol: x402
Listed price: 0.01 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: GET https://x402-doctor.onrender.com/api/v1/diagnose
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z