PolymarketDocumentation/docs/api-reference/market-data/get-midpoint-prices-request-body.md

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Get midpoint prices (request body)

Retrieves midpoint prices for multiple token IDs using a request body. The midpoint is calculated as the average of the best bid and best ask prices.

OpenAPI

openapi: 3.1.0
info:
  title: Polymarket CLOB API
  description: Polymarket CLOB API Reference
  license:
    name: MIT
    identifier: MIT
  version: 1.0.0
servers:
  - url: https://clob.polymarket.com
    description: Production CLOB API
  - url: https://clob-staging.polymarket.com
    description: Staging CLOB API
security: []
tags:
  - name: Trade
    description: Trade endpoints
  - name: Markets
    description: Market data endpoints
  - name: Account
    description: Account and authentication endpoints
  - name: Notifications
    description: User notification endpoints
  - name: Rewards
    description: Rewards and earnings endpoints
  - name: Rebates
    description: Maker rebate endpoints
paths:
  /midpoints:
    post:
      tags:
        - Market Data
      summary: Get midpoint prices (request body)
      description: >
        Retrieves midpoint prices for multiple token IDs using a request body.

        The midpoint is calculated as the average of the best bid and best ask
        prices.
      operationId: getMidpointsPost
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: array
              items:
                $ref: '#/components/schemas/BookRequest'
            example:
              - token_id: 0xabc123def456...
              - token_id: 0xdef456abc123...
      responses:
        '200':
          description: Successfully retrieved midpoint prices
          content:
            application/json:
              schema:
                type: object
                additionalProperties:
                  type: string
                description: Map of token ID to midpoint price
              example:
                0xabc123def456...: '0.45'
                0xdef456abc123...: '0.52'
        '400':
          description: Bad request - Invalid payload
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error: Invalid payload
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error: error getting the mid price
      security: []
components:
  schemas:
    BookRequest:
      type: object
      required:
        - token_id
      properties:
        token_id:
          type: string
          description: Token ID (asset ID)
          example: 0xabc123def456...
        side:
          type: string
          description: Order side (optional, not used for midpoint calculation)
          enum:
            - BUY
            - SELL
          example: BUY
    ErrorResponse:
      type: object
      required:
        - error
      properties:
        error:
          type: string
          description: Error message

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