openapi: 3.1.0
info:
  title: EODHD Financial Data Calendar Market Data API
  description: Comprehensive API for retrieving financial data including stock prices, fundamentals, calendar events, news, and more from EOD Historical Data (eodhd.com)
  version: 2.0.0
  contact:
    name: EODHD Support
    url: https://eodhd.com
    email: supportlevel1@eodhistoricaldata.com
  termsOfService: https://eodhd.com/financial-apis/terms-conditions
  license:
    name: Proprietary
    url: https://eodhd.com/financial-apis/terms-conditions
servers:
- url: https://eodhd.com/api
  description: Primary API path
- url: https://eodhistoricaldata.com/api
  description: Alternative API path
security:
- EODHDQueryKey: []
tags:
- name: Market Data
  description: Market capitalization and other market data
paths:
  /historical-market-cap/{ticker}:
    get:
      summary: Retrieve historical market capitalization data
      description: Fetches historical market capitalization for a specified stock symbol with weekly frequency.
      operationId: GetHistoricalMarketCap
      parameters:
      - name: ticker
        in: path
        required: true
        description: The ticker symbol of the stock, e.g., 'AAPL.US' or simply 'AAPL'.
        schema:
          type: string
      - name: api_token
        in: query
        required: true
        description: Your API key for authentication.
        schema:
          type: string
      - name: from
        in: query
        required: false
        description: Start date for data retrieval in 'YYYY-MM-DD' format.
        schema:
          type: string
          format: date
      - name: to
        in: query
        required: false
        description: End date for data retrieval in 'YYYY-MM-DD' format.
        schema:
          type: string
          format: date
      - name: reverse
        in: query
        required: false
        description: Set to 'true' to reverse sort order (newest first).
        schema:
          type: string
          enum:
          - 'true'
          - 'false'
      - name: fmt
        in: query
        required: false
        description: Output format, either 'json' or 'csv'. Defaults to 'json'.
        schema:
          type: string
          enum:
          - json
          - csv
          default: json
      responses:
        '200':
          description: 'Successfully retrieved historical market capitalization data.


            The response is a JSON object whose keys are sequential integer indices (as strings: "0", "1", "2", ...) and whose values are objects containing `date` and `value`. Iterate over the values, not the keys.

            '
          content:
            application/json:
              schema:
                type: object
                additionalProperties:
                  type: object
                  properties:
                    date:
                      type: string
                      format: date
                      description: The date of the market capitalization value.
                    value:
                      type: number
                      description: Market capitalization value in USD.
                  required:
                  - date
                  - value
              example:
                '0':
                  date: '2022-06-07'
                  value: 2406898266500
                '1':
                  date: '2022-06-14'
                  value: 2148744629600
                '2':
                  date: '2022-06-21'
                  value: 2199080542500
                '3':
                  date: '2022-06-28'
                  value: 2212148752300
        '400':
          description: Invalid request parameters.
        '401':
          description: Unauthorized. Invalid API token.
        '404':
          description: Market capitalization data not found for the specified ticker or date range.
      tags:
      - Market Data
components:
  securitySchemes:
    EODHDQueryKey:
      type: apiKey
      in: query
      name: api_token
      description: EODHD API key (stored as a secret in ChatGPT).