Enriched quote for an x402 endpoint: probes it unpaid (never pays, SSRF-checked), decodes

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xc55A2D530b53CBaD1001e4AfD4720B7E71f9C291",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "2000",
    "maxTimeoutSeconds": 60
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "url": "https://402utils.com/v1/rss-to-json"
        },
        "type": "http"
      },
      "output": {
        "example": {
          "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
          "description": "Fetch an RSS 2.0 or Atom feed and return clean JSON.",
          "isX402": true,
          "marketContext": {
            "category": "rss",
            "cheaperThanMarket": true,
            "medianForCategory": 0.003,
            "sampleSize": 4
          },
          "network": "eip155:8453",
          "payTo": "0x209693Bc6afc0C5328bA36FaF03C514EF312287C",
          "price": "2000",
          "priceUsd": 0.002,
          "resource": "https://402utils.com/v1/rss-to-json",
          "status": 402
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "description": "Query string only.",
              "properties": {
                "url": {
                  "description": "Public http(s) URL of the x402 endpoint to quote (required).",
                  "format": "uri",
                  "type": "string"
                }
              },
              "required": [
                "url"
              ],
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "properties": {
                "asset": {
                  "type": "string"
                },
                "description": {
                  "type": "string"
                },
                "discovery": {
                  "description": "Bazaar/discovery extension, passed through verbatim when present.",
                  "type": "object"
                },
                "isX402": {
                  "type": "boolean"
                },
                "marketContext": {
                  "properties": {
                    "category": {
                      "description": "Derived category keyword the market is sampled for.",
                      "type": "string"
                    },
                    "cheaperThanMarket": {
                      "description": "True when this endpoint's USD price is below the category median.",
                      "type": "boolean"
                    },
                    "medianForCategory": {
                      "description": "Median USD price across the matched category (omitted if <3 matches).",
                      "type": "number"
                    },
                    "sampleSize": {
                      "description": "USD-priced Bazaar resources matched for the category.",
                      "type": "integer"
                    }
                  },
                  "required": [
                    "category",
                    "sampleSize"
                  ],
                  "type": "object"
                },
                "network": {
                  "type": "string"
                },
                "payTo": {
                  "type": "string"
                },
                "price": {
                  "description": "Chosen accept's amount in atomic units of the asset.",
                  "type": "string"
                },
                "priceUsd": {
                  "description": "USD price when the asset is a recognised USD stablecoin.",
                  "type": "number"
                },
                "resource": {
                  "type": "string"
                },
                "status": {
                  "type": "integer"
                }
              },
              "required": [
                "isX402",
                "status"
              ],
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

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

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

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