Convert between YAML and JSON in one call

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xc55A2D530b53CBaD1001e4AfD4720B7E71f9C291",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 60
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "input": "services:\n  web:\n    image: nginx:1.29\n    ports:\n      - \"80:80\"\n",
          "to": "json"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "result": {
            "services": {
              "web": {
                "image": "nginx:1.29",
                "ports": [
                  "80:80"
                ]
              }
            }
          }
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "description": "Conversion request.",
              "properties": {
                "input": {
                  "description": "The value to convert. With to:\"json\": a single YAML document as a string, max 2 MB UTF-8. With to:\"yaml\": any JSON value; a string is first parsed as JSON text."
                },
                "to": {
                  "description": "Target format: \"json\" parses YAML text, \"yaml\" emits YAML text.",
                  "enum": [
                    "json",
                    "yaml"
                  ],
                  "type": "string"
                }
              },
              "required": [
                "input",
                "to"
              ],
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "description": "Conversion result.",
              "properties": {
                "result": {
                  "description": "With to:\"json\": the parsed document as a JSON value (object, array, string, number, boolean or null). With to:\"yaml\": the YAML text as a string."
                }
              },
              "required": [
                "result"
              ],
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

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