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

# Get midpoints

> Batch midpoint prices. Sums of YES and NO midpoints converge to ~1.0 in healthy markets.



## OpenAPI

````yaml /api-reference/openapi.yaml post /midpoints
openapi: 3.0.3
info:
  title: XO Orderbook API
  description: |
    Public REST surface of the XO CLOB API.

    XO mainnet chain id is `3223`. The EIP-712 order domain is
    `XO Market CLOB` with `verifyingContract` set to the
    [CTF Exchange](/) address. See
    [Smart accounts](../guides/smart-accounts) for the smart-account
    identity model and ERC-1271 order signing.

    Wire conventions:
      * Prices are trimmed decimal strings (e.g. `"0.5"`, `"0.555"`).
      * Sizes are decimal-string integers in human shares.
      * Timestamps in trade and book responses are stringified Unix
        seconds / milliseconds (the SDK uses `TimestampSeconds<String>`
        / `TimestampMilliSeconds<String>`).
      * Token IDs are decimal U256 strings; condition IDs are
        `0x`-prefixed 32-byte hex.
  version: 1.0.0
  contact:
    name: XO Market
    url: https://beta.xo.market
servers:
  - url: https://orderbooks.xo.market
    description: Mainnet (XO chain id 3223)
security: []
tags:
  - name: Authentication
    description: >-
      Create and manage API keys. The L1 ClobAuth EIP-712 flow mints HMAC
      credentials that authenticate every other private request.
  - name: Market Data
    description: >-
      Public reads for books, prices, midpoints, spreads, last trades, and price
      history. Also includes server time and per-token configuration.
  - name: Markets
    description: >-
      Discovery for tradable markets, including pagination and SDK-compatible
      simplified shapes.
  - name: Trade
    description: Place, cancel, and inspect orders and trades for the authenticated maker.
  - name: Account
    description: Maker balance, allowance, positions, and claimable settled positions.
paths:
  /midpoints:
    post:
      tags:
        - Market Data
      summary: Get midpoints
      description: >-
        Batch midpoint prices. Sums of YES and NO midpoints converge to ~1.0 in
        healthy markets.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: array
              items:
                type: object
                required:
                  - token_id
                properties:
                  token_id:
                    type: string
            examples:
              two_tokens:
                summary: both sides of a binary market
                value:
                  - token_id: >-
                      26516164265702901957933644848127860370782874751279270726689263951695181556943
                  - token_id: >-
                      13730057904096984444199595880113152612639388204530324084054099203558669491245
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                additionalProperties:
                  type: string
                description: |
                  Map of `<token_id> → <midpoint>`. Tokens missing from
                  the response had no orderbook entry.
              examples:
                populated:
                  summary: both midpoints (illustrative)
                  value:
                    '26516164265702901957933644848127860370782874751279270726689263951695181556943': '0.550'
                    '13730057904096984444199595880113152612639388204530324084054099203558669491245': '0.450'
                empty:
                  summary: both tokens have no liquidity
                  value:
                    '26516164265702901957933644848127860370782874751279270726689263951695181556943': '0.000'
                    '13730057904096984444199595880113152612639388204530324084054099203558669491245': '0.000'
      x-codeSamples:
        - lang: Rust
          label: xo-orderbook-client-rs
          source: >
            use xo_orderbook_client::orderbook::{Client, Config};

            use xo_orderbook_client::orderbook::types::request::MidpointRequest;

            use xo_orderbook_client::types::U256;


            let client = Client::new("https://orderbooks.xo.market",
            Config::default())?;

            let yes =
            U256::from_str_radix("26516164265702901957933644848127860370782874751279270726689263951695181556943",
            10)?;

            let no  =
            U256::from_str_radix("13730057904096984444199595880113152612639388204530324084054099203558669491245",
            10)?;

            let mids = client
                .midpoints(&[
                    MidpointRequest { token_id: yes },
                    MidpointRequest { token_id: no },
                ])
                .await?;
            // Keyed by token_id string; value is the midpoint decimal.

````