> ## Documentation Index
> Fetch the complete documentation index at: https://docs.amberdata.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Batch Historical

> Delivers batch historical open interest data for multiple options contracts, providing timestamped values that reflect the total number of outstanding contracts over specified time ranges across supported exchanges.

<Warning>
  The maximum time range (difference between `startDate` and `endDate`) is:

  * 62 days of daily, hourly or minutely data
  * This endpoint only stores the most recent 62 days of data.
  * Queries with a startDate older than 62 days from the current date will result in a 410 error.

  In order to get more than the maximum allowed, you can use the Historical endpoint found [here](/http/md/options-open-interest) .
</Warning>

<Note>
  If you omit `startDate` and `endDate`, the API will return the most recent 62 days of daily data (not data older than 62 days from the current date).
</Note>


## OpenAPI

````yaml get /options/batch-open-interest/{exchange}
openapi: 3.1.0
info:
  title: market-api
  version: '2'
servers:
  - url: https://api.amberdata.com/markets
security:
  - ApiKeyAuth: []
paths:
  /options/batch-open-interest/{exchange}:
    get:
      summary: Batch Historical
      description: >-
        Delivers batch historical open interest data for multiple options
        contracts, providing timestamped values that reflect the total number of
        outstanding contracts over specified time ranges across supported
        exchanges.
      operationId: batch-historical-ent-2
      parameters:
        - name: exchange
          in: path
          description: The exchange for which to retrieve the most current data.
          schema:
            type: string
            default: deribit
          required: true
        - name: instruments
          in: query
          description: >-
            **[Required]** The instrument(s) for which to retrieve the most
            current data (comma separated).  **[Maximum]** 50 instruments
          required: true
          schema:
            type: string
            default: BTC-29DEC23-30000-C
        - name: startDate
          in: query
          description: >-
            **[Optional]** Payload only includes data after this date
            (inclusive). **[Formats]** `seconds | milliseconds | iso8601`
            **[Examples]** `1578531600 | 1578531600000 | 2020-09-01T01:00:00`
          schema:
            type: string
            format: date-time
        - name: endDate
          in: query
          description: >-
            **[Optional]** Payload only includes data before this date
            (exclusive). **[Formats]** `seconds | milliseconds | iso8601`
            **[Examples]** `1578531600 | 1578531600000 | 2020-09-01T01:00:00`
          schema:
            type: string
            format: date-time
        - name: timeInterval
          in: query
          description: >-
            **[Optional]** Time interval. **[Defaults]** `ticks | minutes |
            hours | days*`
          schema:
            type: string
        - name: timeFormat
          in: query
          description: >-
            **[Optional]** Time format of the timestamps in the return payload.
            **[Defaults]** `milliseconds | ms* | iso | iso8601 | hr |
            human_readable`
          schema:
            type: string
        - name: Accept-Encoding
          in: header
          required: true
          description: ''
          schema:
            type: string
            default: gzip, deflate, br
        - name: api-version
          in: header
          schema:
            type: string
      responses:
        '200':
          description: '200'
          content:
            application/json:
              examples:
                Result:
                  value:
                    status: 200
                    title: OK
                    description: Successful request
                    payload:
                      metadata:
                        next: null
                        api-version: '2023-09-30'
                      data:
                        - instrument: BTC-14MAR25-100000-C
                          exchangeTimestamp: 1740009600000
                          value: 4.7
                          type: null
                        - instrument: BTC-14MAR25-100000-C
                          exchangeTimestamp: 1740096000000
                          value: 7.9
                          type: null
              schema:
                type: object
                properties:
                  status:
                    type: integer
                  title:
                    type: string
                  description:
                    type: string
                  payload:
                    type: object
                    properties:
                      metadata:
                        type: object
                        properties:
                          next:
                            type: string
                          api-version:
                            type: string
                      data:
                        type: array
                        items:
                          type: object
                          properties:
                            instrument:
                              type: string
                            exchangeTimestamp:
                              type: integer
                            value:
                              type: number
                            type:
                              type: string
        '400':
          description: '400'
          content:
            application/json:
              examples:
                Result:
                  value: '{}'
              schema:
                type: object
                properties: {}
      deprecated: false
      security:
        - ApiKeyAuth: []
components:
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key

````