Forum Market Data API

openapi: 3.1.0
info:
  title: Forum Account Market Data API
  version: '1.0'
  description: 'The Forum API provides programmatic access to the Forum perpetual futures exchange.

    Trade attention-based perpetual futures, access real-time market data, and manage your account.


    ## Base URL


    All endpoints are relative to `https://api.forum.market/v1`.


    ## Authentication


    Public endpoints (market data, exchange status) require no authentication.

    Private endpoints (orders, positions, account) require HMAC-SHA256 signed requests.


    See the [Authentication](/api-reference/authentication) guide for details.

    '
  contact:
    name: Forum Support
    email: contact@forum.market
    url: https://forum.market
  termsOfService: https://forum-legal.s3.us-east-2.amazonaws.com/terms-of-service.pdf
servers:
- url: https://api.forum.market/v1
  description: Production
security:
- ForumAccessKey: []
  ForumAccessTimestamp: []
  ForumAccessSign: []
tags:
- name: Market Data
  description: Order books, tickers, trades, and candles
paths:
  /markets/{ticker}/book:
    get:
      operationId: getOrderBook
      summary: Get order book
      description: Returns the current order book snapshot for a market. Use sequence numbers with WebSocket `book_updates` channel for real-time updates.
      tags:
      - Market Data
      security: []
      parameters:
      - $ref: '#/components/parameters/TickerPath'
      - name: depth
        in: query
        schema:
          type: integer
          minimum: 1
          maximum: 100
          default: 20
        description: Number of price levels per side
      responses:
        '200':
          description: Order book snapshot
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/OrderBook'
        '404':
          $ref: '#/components/responses/NotFound'
        '429':
          $ref: '#/components/responses/RateLimited'
  /markets/{ticker}/trades:
    get:
      operationId: getRecentTrades
      summary: Get recent trades
      description: Returns recent public trades for a market. A trade occurs at the price of the maker (resting) order.
      tags:
      - Market Data
      security: []
      parameters:
      - $ref: '#/components/parameters/TickerPath'
      - name: limit
        in: query
        schema:
          type: integer
          minimum: 1
          maximum: 500
          default: 100
        description: Maximum number of trades to return
      - name: cursor
        in: query
        schema:
          type: string
        description: Opaque pagination cursor from a previous response
      responses:
        '200':
          description: Recent trades
          content:
            application/json:
              schema:
                type: object
                required:
                - data
                - nextCursor
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/PublicTrade'
                  nextCursor:
                    type: string
                    nullable: true
                    description: Opaque cursor for fetching the next page, or null if no more results
        '429':
          $ref: '#/components/responses/RateLimited'
  /markets/{ticker}/candles:
    get:
      operationId: getCandles
      summary: Get candlestick data
      description: Returns OHLCV candlestick data for a market within a time range.
      tags:
      - Market Data
      security: []
      parameters:
      - $ref: '#/components/parameters/TickerPath'
      - name: interval
        in: query
        required: true
        schema:
          type: string
          enum:
          - 1m
          - 5m
          - 1d
        description: Candle interval
      - name: start
        in: query
        required: true
        schema:
          type: string
          format: date-time
        description: Start time (ISO 8601)
        example: '2026-02-24T00:00:00.000Z'
      - name: end
        in: query
        schema:
          type: string
          format: date-time
        description: End time (ISO 8601). Defaults to current time.
      - name: limit
        in: query
        schema:
          type: integer
          minimum: 1
          maximum: 2500
          default: 2500
        description: Maximum number of candles to return
      responses:
        '200':
          description: Candlestick data
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/CandlestickRecord'
        '400':
          $ref: '#/components/responses/BadRequest'
        '429':
          $ref: '#/components/responses/RateLimited'
components:
  schemas:
    PublicTrade:
      type: object
      required:
      - tradeId
      - ticker
      - price
      - quantity
      - takerSide
      - timestamp
      properties:
        tradeId:
          type: integer
          description: Unique trade identifier
          example: 5678
        ticker:
          type: string
          example: OPENAI
        price:
          type: number
          description: Trade price in cents
          example: 10550
        quantity:
          type: number
          example: 5
        takerSide:
          type: string
          enum:
          - buy
          - sell
          description: Side of the taker order
          example: buy
        timestamp:
          type: string
          format: date-time
          example: '2026-02-25T12:00:00.100Z'
    ErrorResponse:
      type: object
      required:
      - error
      properties:
        error:
          type: object
          required:
          - code
          - message
          properties:
            code:
              type: string
              description: Machine-readable error code
              example: INVALID_PARAMETER
            message:
              type: string
              description: Human-readable error message
              example: Request validation failed
            details:
              type: object
              description: Additional error details
              example:
                fields:
                - field: ticker
                  message: Required
    OrderBook:
      type: object
      required:
      - ticker
      - bids
      - asks
      - seq
      - updatedAt
      properties:
        ticker:
          type: string
          example: OPENAI
        bids:
          type: array
          maxItems: 100
          description: Bid levels sorted by descending price in cents
          items:
            $ref: '#/components/schemas/BookLevel'
        asks:
          type: array
          maxItems: 100
          description: Ask levels sorted by ascending price in cents
          items:
            $ref: '#/components/schemas/BookLevel'
        seq:
          type: integer
          description: Sequence number for gap detection
          example: 12345
        updatedAt:
          type: string
          format: date-time
          description: Last update timestamp (ISO 8601)
          example: '2026-02-25T12:00:00.000Z'
    CandlestickRecord:
      type: object
      required:
      - ticker
      - interval
      - start
      - open
      - high
      - low
      - close
      - volume
      - active
      properties:
        ticker:
          type: string
          example: OPENAI
        interval:
          type: string
          enum:
          - 1m
          - 5m
          - 1d
          example: 1m
        start:
          type: string
          format: date-time
          description: Candle period start time
          example: '2026-02-25T12:00:00.000Z'
        open:
          type: number
          description: Opening price in cents
          example: 10500
        high:
          type: number
          description: Highest price in cents
          example: 10600
        low:
          type: number
          description: Lowest price in cents
          example: 10450
        close:
          type: number
          description: Closing price in cents
          example: 10550
        volume:
          type: number
          description: Volume in cents
          example: 150
        active:
          type: boolean
          description: Whether this candle is still in its active period
          example: true
    BookLevel:
      type: object
      required:
      - price
      - qty
      properties:
        price:
          type: number
          description: Price level in cents
          example: 10500
        qty:
          type: number
          description: Total quantity at this price level
          example: 10
  responses:
    NotFound:
      description: Resource not found
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            error:
              code: NOT_FOUND
              message: Resource not found
    BadRequest:
      description: Invalid request parameters
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            error:
              code: INVALID_PARAMETER
              message: Request validation failed
              details:
                fields:
                - field: ticker
                  message: Required
    RateLimited:
      description: Rate limit exceeded
      headers:
        Retry-After:
          schema:
            type: integer
          description: Seconds to wait before retrying
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            error:
              code: RATE_LIMIT_EXCEEDED
              message: Rate limit exceeded. Try again in 5 seconds.
  parameters:
    TickerPath:
      name: ticker
      in: path
      required: true
      schema:
        type: string
      description: Market ticker symbol
      example: OPENAI
  securitySchemes:
    ForumAccessKey:
      type: apiKey
      in: header
      name: FORUM-ACCESS-KEY
      description: Your API key ID (e.g. `fk_a1b2c3d4e5f6...`)
    ForumAccessTimestamp:
      type: apiKey
      in: header
      name: FORUM-ACCESS-TIMESTAMP
      description: Unix epoch in seconds (UTC), as a string
    ForumAccessSign:
      type: apiKey
      in: header
      name: FORUM-ACCESS-SIGN
      description: 'Base64-encoded HMAC-SHA256 signature.


        **Signature generation:**

        ```

        prehash = timestamp + method + requestPath + body

        signature = Base64(HMAC-SHA256(secret, prehash))

        ```

        '