Measures topsoil ph for two to ten named European sites and ranks the observed values with

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "locations": [
            {
              "latitude": 51.9,
              "longitude": 7.1,
              "name": "A"
            },
            {
              "latitude": 51.95,
              "longitude": 7.2,
              "name": "B"
            }
          ]
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "additionalProperties": false,
              "properties": {
                "locations": {
                  "items": {
                    "additionalProperties": false,
                    "properties": {
                      "latitude": {
                        "description": "WGS84 latitude inside the published European coverage.",
                        "maximum": 72.5,
                        "minimum": 34,
                        "type": "number"
                      },
                      "longitude": {
                        "description": "WGS84 longitude inside the published European coverage.",
                        "maximum": 40.5,
                        "minimum": -31.5,
                        "type": "number"
                      },
                      "name": {
                        "maxLength": 60,
                        "minLength": 1,
                        "type": "string"
                      }
                    },
                    "required": [
                      "longitude",
                      "latitude"
                    ],
                    "type": "object"
                  },
                  "maxItems": 10,
                  "minItems": 2,
                  "type": "array"
                }
              },
              "required": [
                "locations"
              ],
              "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"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  },
  "payment-identifier": {
    "info": {
      "required": false
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "id": {
          "maxLength": 128,
          "minLength": 16,
          "pattern": "^[a-zA-Z0-9_-]+$",
          "type": "string"
        },
        "required": {
          "type": "boolean"
        }
      },
      "required": [
        "required"
      ],
      "type": "object"
    }
  }
}

curl "https://landvergleich.halowerk.com/v1/rank-sites-soil-ph"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://landvergleich.halowerk.com/v1/rank-sites-soil-ph");
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://landvergleich.halowerk.com/v1/rank-sites-soil-ph")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header