Add-on, air quality for one location: US AQI category and PM2

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x2d16a243ba9facc6ac85519d5efad2149dc4c6c3",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "8qEn3Y3GPXdQ28LHshPa4UYeD8V38Lq9b4jCRirQAY3n",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "5000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "discoverable": true,
    "info": {
      "input": {
        "example": {
          "loc": "us-stlouis"
        },
        "exampleRequest": "/gauge/air?loc=us-stlouis",
        "method": "GET",
        "queryParams": {
          "loc": "required - location id; full list at free /gauge/preview"
        },
        "type": "http"
      },
      "output": {
        "type": "json"
      }
    },
    "outputSchemaRef": "/manifest",
    "priceUsd": "$0.005",
    "priceUsdNumber": 0.005,
    "routeTemplate": "/gauge/air",
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "additionalProperties": false,
              "properties": {
                "loc": {
                  "description": "required - location id; full list at free /gauge/preview",
                  "examples": [
                    "us-stlouis",
                    "us-memphis",
                    "us-losangeles",
                    "us-fresno",
                    "us-phoenix",
                    "us-denver"
                  ],
                  "type": "string",
                  "x-accepted-values": {
                    "all": "https://api.truthbear.co/schemas/gauge-air.input.json",
                    "shown": 6,
                    "total": 12
                  }
                }
              },
              "required": [
                "loc"
              ],
              "type": "object"
            },
            "type": {
              "const": "http"
            }
          },
          "required": [
            "type",
            "method",
            "queryParams"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "type": {
              "const": "json"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      }
    }
  }
}

curl "https://api.truthbear.co/gauge/air"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://api.truthbear.co/gauge/air");
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://api.truthbear.co/gauge/air")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header