Headline national CPI, year-on-year growth rate (%), monthly, from the official OECD SDMX

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x6ab8efe305cce67daa48c97bde29c04402822dff",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "2000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "country": "USA",
          "last_n": 3
        },
        "type": "http"
      },
      "output": {
        "example": {
          "country": "FRA",
          "country_name": "France",
          "latest_annual_rate_percent": 0.9021049,
          "latest_period": "2025-12",
          "measure": "Consumer price index, all items, annual growth rate, percent",
          "observations": [
            {
              "annual_rate_percent": 0.7919967,
              "period": "2025-11"
            },
            {
              "annual_rate_percent": 0.9021049,
              "period": "2025-12"
            }
          ],
          "source": "OECD Data Explorer, dataset DSD_PRICES@DF_PRICES_ALL (CC BY 4.0)"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET",
                "HEAD",
                "DELETE"
              ],
              "type": "string"
            },
            "queryParams": {
              "properties": {
                "country": {
                  "default": "USA",
                  "description": "OECD REF_AREA code (USA, GBR, JPN, FRA...)",
                  "type": "string"
                },
                "last_n": {
                  "default": 1,
                  "description": "Number of most recent months (1-24)",
                  "type": "integer"
                }
              },
              "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://data.greeneris.io/v1/oecd/cpi"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

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