{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/awattar/main/json-schema/awattar-market-data-response.json",
  "title": "aWATTar Market Data Response",
  "description": "Schema for the aWATTar API /v1/marketdata endpoint response containing hourly EPEX Spot electricity market prices",
  "type": "object",
  "properties": {
    "object": {
      "type": "string",
      "description": "Type identifier for the response object",
      "const": "list"
    },
    "data": {
      "type": "array",
      "description": "Array of hourly market price entries",
      "items": {
        "$ref": "#/$defs/MarketPriceEntry"
      }
    }
  },
  "required": ["object", "data"],
  "$defs": {
    "MarketPriceEntry": {
      "title": "Market Price Entry",
      "description": "A single hourly electricity market price data point from the EPEX Spot exchange",
      "type": "object",
      "properties": {
        "start_timestamp": {
          "type": "integer",
          "description": "Start of the pricing interval as Unix epoch timestamp in milliseconds (UTC)",
          "examples": [1428591600000]
        },
        "end_timestamp": {
          "type": "integer",
          "description": "End of the pricing interval as Unix epoch timestamp in milliseconds (UTC). Typically 3600000 ms (1 hour) after start_timestamp.",
          "examples": [1428595200000]
        },
        "marketprice": {
          "type": "number",
          "description": "EPEX Spot market price for the interval in EUR/MWh. Can be negative during periods of excess renewable energy supply.",
          "examples": [42.09, -5.12, 102.49]
        },
        "unit": {
          "type": "string",
          "description": "Unit of measurement for the market price",
          "const": "Eur/MWh"
        }
      },
      "required": ["start_timestamp", "end_timestamp", "marketprice", "unit"]
    }
  }
}