Tool detail

check-x402

Runs a fast live probe against one given x402 endpoint and reports its payment-challenge readiness without paying it.

Categories: API testing

Use when

check whether an x402 endpoint's payment challenge works before buying
verify an endpoint's price matches what you expect before calling it

Not for

not a full conformance scanner — fewer checks than a dedicated scan tool

Inputs

POST JSON body: endpoint (string, required, uri), method (enum, default GET), expectedPriceUsd (number, optional)

Admitted input schema

{
  "type": "object",
  "properties": {
    "endpoint": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "format": "uri",
      "description": "x402 endpoint to probe without paying."
    },
    "expectedPriceUsd": {
      "type": "number",
      "minimum": -9007199254740991,
      "maximum": 9007199254740991,
      "description": "Expected maximum price in USD."
    },
    "method": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "enum": [
        "GET",
        "POST",
        "PUT",
        "PATCH",
        "DELETE",
        "HEAD"
      ],
      "default": "GET"
    }
  },
  "required": [
    "endpoint"
  ],
  "additionalProperties": false
}

Endpoint

Method: POST
URL: https://trust402.vercel.app/api/trust/check-x402

Payment

Protocol: x402
Listed price: $0.005 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: POST https://trust402.vercel.app/api/trust/check-x402
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z