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

# List Index Levels History

> Returns historical index levels, optionally filtered by date.



## OpenAPI

````yaml GET /api/v1/indexes/{index_id}/levels/history
openapi: 3.0.3
info:
  title: TILT
  version: 0.0.1
servers: []
security: []
paths:
  /api/v1/indexes/{index_id}/levels/history:
    get:
      tags:
        - api
      description: Returns historical index levels, optionally filtered by date.
      operationId: api_v1_indexes_levels_history_retrieve
      parameters:
        - in: path
          name: index_id
          schema:
            type: string
          required: true
        - in: query
          name: start_date
          schema:
            type: string
          description: >-
            Only return published levels on or after this date, in the format
            YYYY-MM-DD.
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ExternalIndexLevel'
          description: ''
        '400':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/IndexAPIError'
          description: ''
        '401':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/IndexAPIError'
          description: ''
        '403':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/IndexAPIError'
          description: ''
        '404':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/IndexAPIError'
          description: ''
      security:
        - ProAPIToken: []
components:
  schemas:
    ExternalIndexLevel:
      type: object
      properties:
        index_levels:
          type: object
          additionalProperties:
            type: string
            format: decimal
            pattern: ^-?\d{0,13}(?:\.\d{0,2})?$
      required:
        - index_levels
    IndexAPIError:
      type: object
      description: |-
        Canonical error shape for the index API endpoints: every 4xx response is
        a single object ``{"error": {"code", "message"}}``.
      properties:
        error:
          $ref: '#/components/schemas/IndexAPIErrorDetail'
      required:
        - error
    IndexAPIErrorDetail:
      type: object
      properties:
        code:
          type: string
          description: Machine-readable error code, e.g. not_found, invalid_parameter.
        message:
          type: string
          description: Human-readable error description.
      required:
        - code
        - message
  securitySchemes:
    ProAPIToken:
      type: apiKey
      in: header
      name: X-Api-Key

````