Sends a request to a web address you provide and reports back everything the server said i

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "8ugAWAXDB8V18kiUrGZTq1oMvU3C6Fxs8hfC6rvzQT3b",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "10000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "follow_redirects": true,
          "method": "GET",
          "url": "https://example.com"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "api_version": "1.0.0",
          "final_url": "https://example.com/",
          "headers": {
            "cache-control": "max-age=600",
            "content-length": "1256",
            "content-type": "text/html; charset=UTF-8",
            "server": "nginx"
          },
          "missing_security_headers": [
            "strict-transport-security",
            "content-security-policy"
          ],
          "redirect_chain": [
            {
              "status_code": 301,
              "url": "http://example.com"
            }
          ],
          "response_time_ms": 214,
          "status_code": 200,
          "url": "https://example.com"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "additionalProperties": false,
              "properties": {
                "follow_redirects": {
                  "description": "Whether to follow redirects to their final destination or stop at the first one",
                  "type": "boolean"
                },
                "method": {
                  "description": "Either GET or HEAD; GET fetches the page normally, HEAD only asks for headers without the body",
                  "type": "string"
                },
                "url": {
                  "description": "The full web address to check, including http:// or https://",
                  "type": "string"
                }
              },
              "required": [
                "url"
              ],
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "properties": {
                "api_version": {
                  "type": "string"
                },
                "final_url": {
                  "type": "string"
                },
                "headers": {
                  "additionalProperties": true,
                  "type": "object"
                },
                "missing_security_headers": {
                  "items": {
                    "type": "string"
                  },
                  "type": "array"
                },
                "redirect_chain": {
                  "items": {
                    "type": "object"
                  },
                  "type": "array"
                },
                "response_time_ms": {
                  "type": "integer"
                },
                "status_code": {
                  "type": "integer"
                },
                "url": {
                  "type": "string"
                }
              },
              "required": [
                "api_version",
                "url",
                "final_url",
                "status_code",
                "redirect_chain",
                "headers",
                "missing_security_headers",
                "response_time_ms"
              ],
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

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

const res = await fetch("https://http-header-checker.underscoredone.com/check");
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://http-header-checker.underscoredone.com/check")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header