{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "SeriesRequest",
  "type": "object",
  "description": "A single series request within a multi-series call.",
  "properties": {
    "mnemonic": {
      "type": "string",
      "description": "The unique series mnemonic identifier."
    },
    "freq": {
      "type": "string",
      "description": "Desired output frequency."
    },
    "trans": {
      "type": "string",
      "description": "Mathematical transformation to apply."
    },
    "startDate": {
      "type": "string",
      "description": "Start date for the data range."
    },
    "endDate": {
      "type": "string",
      "description": "End date for the data range."
    },
    "vintage": {
      "type": "string",
      "description": "Vintage date for historical data revisions."
    }
  }
}