> ## 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.

# Term Structures Constant

> This endpoint returns the term structure (for exchange listed expirations) with forward volatility calculations, for constant "daysToExpiration" maturities.

USA Trading hours are 14:30:00 - 21:00:00 UTC (9:30a-4pm ET)




## OpenAPI

````yaml get /analytics/volatility/term-structures/forward-volatility/constant/tradfi
openapi: 3.1.0
info:
  title: derivatives-api
  version: '2'
servers:
  - url: https://api.amberdata.com/markets/derivatives
security:
  - sec0: []
paths:
  /analytics/volatility/term-structures/forward-volatility/constant/tradfi:
    get:
      summary: Term Structures Constant
      description: >
        This endpoint returns the term structure (for exchange listed
        expirations) with forward volatility calculations, for constant
        "daysToExpiration" maturities.


        USA Trading hours are 14:30:00 - 21:00:00 UTC (9:30a-4pm ET)
      operationId: tradfi-volatility-term-structures-constant
      parameters:
        - name: currency
          in: query
          description: >
            **[Required]** The underlying currency for which there are listed
            option instruments. 

            **[Examples]** ` IBIT | COIN ` 
          required: true
          schema:
            type: string
            default: BITO
        - name: timestamp
          in: query
          description: |-
            **[Required]** Payload only includes data for this timestamp. 
            **[Formats]** `seconds | milliseconds | iso8601`
            **[Examples]** `1578531600 | 1578531600000 | 2024-11-19`
          schema:
            type: string
            format: date-time
        - 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
      responses:
        '200':
          description: '200'
          content:
            application/json:
              schema:
                type: object
                properties:
                  status:
                    type: integer
                  title:
                    type: string
                  description:
                    type: string
                  payload:
                    type: object
              examples:
                Result:
                  value:
                    status: 200
                    title: OK
                    description: Successful request
                    payload:
                      data:
                        - atm: 48.07
                          currency: BITO
                          daysToExpiration: 5
                          exchange: tradfi
                          fwdAtm: null
                          timestamp: 2024-10-02 20:00:00 000
                        - atm: 46.89
                          currency: BITO
                          daysToExpiration: 10
                          exchange: tradfi
                          fwdAtm: 45.69
                          timestamp: 2024-10-02 20:00:00 000
                        - atm: 49.2
                          currency: BITO
                          daysToExpiration: 21
                          exchange: tradfi
                          fwdAtm: 51.21
                          timestamp: 2024-10-02 20:00:00 000
                      metadata:
                        api-version: '2023-09-30'
        '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

````