Payments · x402 · early usage

utilpeek (Tanod) x402 listing lint: description, resource URL, schema and payment field…

utilpeek (Tanod) x402 listing lint: description, resource URL, schema and payment fields checked, with a suggested description. Use when an agent must lint an x402 listing, or check which of a seller's routes the Bazaar lists, before publishing.

by tanod.dev · discovered, not yet claimed by its owner · updated 2026-10-10

30d calls2

30d payers2

MethodPOST

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Tags: utilpeek · x402 · lint · fx-rates · qr-code · bazaar · builder-code

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-10

Input example from Bazaar metadata

{
  "listing": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "network": "eip155:8453",
        "payTo": "0x209693Bc6afc0C5328bA36FaF03C514EF312287C",
        "scheme": "exact"
      }
    ],
    "resource": {
      "description": "Weather forecast for a city.",
      "mimeType": "application/json",
      "url": "https://api.example.com/v1/weather"
    },
    "x402Version": 2
  }
}

Output example

{
  "checked_at": "2026-10-09T08:00:00Z",
  "checks_passed": 9,
  "description_length": 28,
  "errors": 0,
  "note": "Automated checks of the listing rules Tanod knows (Coinbase CDP's 500-character description limit, the Bazaar's https requirement, required fields); the facilitator or catalog may apply others. The suggested description is a draft to review, not a rewrite of your meaning.",
  "problems": [
    {
      "code": "missing_use_when",
      "message": "When-to-use sentence: No \"use when\" sentence found. Fix: Add one, for example: \"Use when an agent needs X before doing Y.\" Curators look for it; 94% of Bazaar listings lack it.",
      "severity": "warning"
    }
  ],
  "score": 95,
  "source": "listing",
  "suggested_description": "Weather forecast for a city. Use when an agent needs weather data from this endpoint.",
  "suggested_length": 85,
  "url": null,
  "warnings": 1
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/35830.json for the price and payment options.
Pay. Call GET https://tanod.dev/v1/x402/lint. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, Polygon, Solana, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.001 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Polygon, Solana
Demand: 2 calls · 2 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.001	0x593857A4a4F619543ea12394137C3004ce841720	300s
exact	Polygon eip155:137	USDC	$0.001	0x593857A4a4F619543ea12394137C3004ce841720	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.001	RMk9k3VC8dr4hhjgFh88rGhjAbzfBzHxJJ5n2fTcqus	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x593857A4a4F619543ea12394137C3004ce841720",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x593857A4a4F619543ea12394137C3004ce841720",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "RMk9k3VC8dr4hhjgFh88rGhjAbzfBzHxJJ5n2fTcqus",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "checked_at": {
          "type": "string"
        },
        "checks_passed": {
          "type": "integer"
        },
        "description_length": {
          "type": "integer"
        },
        "discovery_url": {
          "type": [
            "string",
            "null"
          ]
        },
        "errors": {
          "type": "integer"
        },
        "host": {
          "type": "string"
        },
        "http_status": {
          "type": "integer"
        },
        "method": {
          "type": "string"
        },
        "mode": {
          "enum": [
            "coverage"
          ],
          "type": "string"
        },
        "note": {
          "type": "string"
        },
        "openapi_url": {
          "type": [
            "string",
            "null"
          ]
        },
        "problems": {
          "items": {
            "properties": {
              "code": {
                "type": "string"
              },
              "message": {
                "type": "string"
              },
              "severity": {
                "enum": [
                  "error",
                  "warning"
                ],
                "type": "string"
              }
            },
            "required": [
              "code",
              "severity",
              "message"
            ],
            "type": "object"
          },
          "type": "array"
        },
        "read_from": {
          "enum": [
            "header",
            "body"
          ],
          "type": "string"
        },
        "routes": {
          "items": {
            "type": "object"
          },
          "type": "array"
        },
        "score": {
          "maximum": 100,
          "minimum": 0,
          "type": "integer"
        },
        "snapshot": {
          "type": [
            "string",
            "null"
          ]
        },
        "source": {
          "enum": [
            "listing",
            "url",
            "coverage"
          ],
          "type": "string"
        },
        "sources": {
          "type": "object"
        },
        "suggested_description": {
          "type": "string"
        },
        "suggested_length": {
          "type": "integer"
        },
        "summary": {
          "type": "object"
        },
        "traps": {
          "items": {
            "type": "object"
          },
          "type": "array"
        },
        "truncated": {
          "type": "boolean"
        },
        "url": {
          "type": [
            "string",
            "null"
          ]
        },
        "warnings": {
          "type": "integer"
        }
      },
      "required": [
        "source",
        "checked_at",
        "note"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "checked_at": "string",
    "checks_passed": 0,
    "description_length": 0,
    "discovery_url": "string",
    "errors": 0,
    "host": "string",
    "http_status": 0,
    "method": "string",
    "mode": "coverage",
    "note": "string",
    "openapi_url": "string",
    "problems": [
      {
        "code": "string",
        "message": "string",
        "severity": "error"
      }
    ],
    "read_from": "header",
    "routes": [
      {}
    ],
    "score": 0,
    "snapshot": "string",
    "source": "listing",
    "sources": {},
    "suggested_description": "string",
    "suggested_length": 0,
    "summary": {},
    "traps": [
      {}
    ],
    "truncated": true,
    "url": "string",
    "warnings": 0
  },
  "type": "string"
}

Examples

curl

curl "https://tanod.dev/v1/x402/lint"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://tanod.dev/v1/x402/lint");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://tanod.dev/v1/x402/lint")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: tanod.dev
Endpoint: https://tanod.dev/v1/x402/lint
Machine-readable: /resources/35830.json