Polygon Indices API

openapi: 3.1.0
info:
  title: Polygon Indices REST API
  version: '1.0'
  description: |
    Polygon Indices API exposes real-time and historical index values
    (e.g., I:SPX, I:NDX) via `https://api.polygon.io`. This spec covers
    the snapshot, aggregates, and previous-close endpoints. Auth uses an
    API key via `apiKey` query parameter or `Authorization: Bearer`.
  contact:
    name: Polygon Documentation
    url: https://polygon.io/docs/indices
servers:
  - url: https://api.polygon.io
    description: Polygon REST API
security:
  - apiKeyQuery: []
  - bearerAuth: []
tags:
  - name: Snapshots
    description: Index snapshot endpoints.
  - name: Aggregates
    description: Index aggregate bar endpoints.
paths:
  /v3/snapshot/indices:
    get:
      tags: [Snapshots]
      operationId: getIndicesSnapshot
      summary: Get Snapshot For Indices
      description: Returns the most recent index values for one or more indices.
      parameters:
        - in: query
          name: ticker.any_of
          schema:
            type: string
          description: Comma-separated list of index tickers (e.g., I:SPX,I:DJI).
        - in: query
          name: limit
          schema:
            type: integer
            default: 10
            maximum: 250
      responses:
        '200':
          description: Indices snapshot response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/IndicesSnapshotResponse'
  /v2/aggs/ticker/{indicesTicker}/range/{multiplier}/{timespan}/{from}/{to}:
    get:
      tags: [Aggregates]
      operationId: getIndicesAggregateBars
      summary: Get Aggregate Bars For An Index
      description: Aggregate bars (OHLC) for an index ticker over a date range.
      parameters:
        - in: path
          name: indicesTicker
          required: true
          schema:
            type: string
        - in: path
          name: multiplier
          required: true
          schema:
            type: integer
        - in: path
          name: timespan
          required: true
          schema:
            type: string
            enum: [minute, hour, day, week, month, quarter, year]
        - in: path
          name: from
          required: true
          schema:
            type: string
        - in: path
          name: to
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Indices aggregate bars response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AggregatesResponse'
  /v2/aggs/ticker/{indicesTicker}/prev:
    get:
      tags: [Aggregates]
      operationId: getIndicesPreviousClose
      summary: Get Previous Close For An Index
      description: Returns the previous day's open/close/high/low for an index.
      parameters:
        - in: path
          name: indicesTicker
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Indices previous close response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AggregatesResponse'
components:
  securitySchemes:
    apiKeyQuery:
      type: apiKey
      in: query
      name: apiKey
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: API Key
  schemas:
    IndexSnapshot:
      type: object
      properties:
        ticker:
          type: string
        name:
          type: string
        value:
          type: number
        last_updated:
          type: integer
          format: int64
        market_status:
          type: string
        type:
          type: string
        session:
          type: object
          properties:
            change:
              type: number
            change_percent:
              type: number
            close:
              type: number
            high:
              type: number
            low:
              type: number
            open:
              type: number
            previous_close:
              type: number
    IndicesSnapshotResponse:
      type: object
      properties:
        status:
          type: string
        request_id:
          type: string
        next_url:
          type: string
          format: uri
        results:
          type: array
          items:
            $ref: '#/components/schemas/IndexSnapshot'
    AggregateBar:
      type: object
      properties:
        v:
          type: number
        vw:
          type: number
        o:
          type: number
        c:
          type: number
        h:
          type: number
        l:
          type: number
        t:
          type: integer
          format: int64
        n:
          type: integer
    AggregatesResponse:
      type: object
      properties:
        ticker:
          type: string
        status:
          type: string
        request_id:
          type: string
        resultsCount:
          type: integer
        results:
          type: array
          items:
            $ref: '#/components/schemas/AggregateBar'