Emission-factor lookup: fetch the underlying factor (value, unit, methodology, source, lic

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xdCA14e2B0F7995fe9263d77A9E7dCd128D1E6dD7",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "3000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "country": "US",
          "mcc": "5411"
        },
        "type": "http"
      },
      "output": {
        "example": {
          "factor": {
            "licence": "Public Domain",
            "methodology": "US EPA USEEIO v2.1",
            "source": "US EPA",
            "unit": "spend-based_kg_co2e_per_usd",
            "value": 0.2845
          }
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "properties": {
                "activity_type": {
                  "description": "Activity-based lookup",
                  "type": "string"
                },
                "bea_code": {
                  "description": "US BEA spend factor",
                  "type": "string"
                },
                "country": {
                  "description": "ISO 3166-1 alpha-2 (optional)",
                  "type": "string"
                },
                "id": {
                  "description": "Exact factor UUID (re-fetch for audit)",
                  "type": "string"
                },
                "mcc": {
                  "description": "Spend classification (also naics/isic/sic/nace)",
                  "type": "string"
                }
              },
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://api.myco2suite.io/api/v1/factor"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://api.myco2suite.io/api/v1/factor");
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.myco2suite.io/api/v1/factor")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header