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

# Open interest and holder stats



## OpenAPI

````yaml /prediction-markets/openapi.json get /v1/markets/{ticker}/oi
openapi: 3.1.0
info:
  title: Prediction Market API (Beta)
  description: >-
    Unified **beta** prediction market API for Kalshi and Polymarket — markets,
    events, full historical trades and candlesticks, orderbooks, crypto up/down
    windows, and Polymarket wallet analytics. Read/market-data only.


    **Auth:** pass your Data API key in the `x-api-key` header.


    **Conventions:** response bodies use camelCase. Query params are snake_case
    (camelCase aliases accepted where noted).


    **Caching:** SWR endpoints may set `X-Cache` (`HIT` | `HIT-STALE` | `MISS`).
    Busy backends may return `503` with `SERVICE_BUSY`.


    **Realtime:** join `pm:*` rooms on
    `wss://datastream.solanatracker.io/{apiKey}` (same Datastream hub as other
    products — see Datastream → Prediction Markets).
  license:
    name: ''
  version: 0.1.0
servers:
  - url: https://prediction-market-api.solanatracker.io
    description: Public beta
security:
  - apiKey: []
tags:
  - name: Exchange
    description: Exchange status
  - name: Events
    description: >-
      Cross-exchange event groupings (Kalshi event_ticker, Polymarket Gamma
      grouped/negRisk events). Includes metadata: image, icon, description,
      tags, and nested markets with groupItemTitle.
  - name: Crypto
    description: >-
      Polymarket crypto up/down (Chainlink) Price to Beat, final price, chart
      history, and series windows.
  - name: Meta
    description: Categories, series, sports, live data
  - name: Markets
    description: Market data, orderbooks, candles
  - name: Trades
    description: Trade feeds
  - name: Accounts
    description: Polymarket wallet analytics (FIFO PnL)
  - name: Leaderboard
    description: Top wallet PnL rankings (Polymarket; Kalshi has no public wallets)
  - name: Stats
    description: Platform statistics
paths:
  /v1/markets/{ticker}/oi:
    get:
      tags:
        - Markets
      summary: Open interest and holder stats
      operationId: get_open_interest_path
      parameters:
        - name: ticker
          in: path
          description: Market ticker or condition id
          required: true
          schema:
            type: string
        - name: exchange
          in: query
          description: kalshi, polymarket, or poly
          required: false
          schema:
            type: string
      responses:
        '200':
          description: Open interest
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/OpenInterestResponse'
        '400':
          description: Bad request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiErrorBody'
        '404':
          description: Not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiErrorBody'
        '408':
          description: Request timeout
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiErrorBody'
        '429':
          description: Rate limit exceeded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiErrorBody'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiErrorBody'
components:
  schemas:
    OpenInterestResponse:
      allOf:
        - $ref: '#/components/schemas/DataProvenance'
        - type: object
          required:
            - marketId
            - exchange
            - uniqueHolders
            - totalVolumeTokens
            - totalTrades
          properties:
            exchange:
              $ref: '#/components/schemas/Exchange'
            marketId:
              type: string
            openInterest:
              type:
                - integer
                - 'null'
              format: int64
              description: Authoritative open interest when the exchange publishes it.
              minimum: 0
            totalTrades:
              type: integer
              format: int64
              description: Total number of trades (activity proxy, not OI).
              minimum: 0
            totalVolumeTokens:
              type: number
              format: double
              description: Total token volume traded (activity proxy, not OI).
            uniqueHolders:
              type: integer
              format: int64
              description: >-
                Unique addresses that have traded this market (activity proxy,
                not OI).
              minimum: 0
      description: Aggregated open interest for a market.
    ApiErrorBody:
      type: object
      description: Standard API error response envelope.
      required:
        - error
        - code
      properties:
        code:
          type: integer
          format: int32
          description: HTTP status code (duplicated for convenience).
          minimum: 0
        error:
          type: string
        errorCode:
          type:
            - string
            - 'null'
          description: >-
            Stable machine-readable code: RATE_LIMITED, SERVICE_BUSY,
            BAD_REQUEST, NOT_FOUND, INTERNAL.
    DataProvenance:
      type: object
      description: Provenance for market-data responses.
      required:
        - source
        - stale
        - estimated
      properties:
        estimated:
          type: boolean
          description: True when the value is derived/estimated rather than authoritative.
        indexedAt:
          type:
            - string
            - 'null'
          description: Local index timestamp when known.
        source:
          type: string
          description: 'Serving source: `indexed`, `upstream`, `unavailable`.'
        sourceUpdatedAt:
          type:
            - string
            - 'null'
          description: Upstream/source event timestamp when known.
        stale:
          type: boolean
          description: True when the payload is older than the freshness SLO.
        unavailableReason:
          type:
            - string
            - 'null'
          description: Why the payload is missing or incomplete.
    Exchange:
      type: string
      enum:
        - polymarket
        - kalshi
  securitySchemes:
    apiKey:
      type: apiKey
      in: header
      name: x-api-key
      description: Solana Tracker Data API key

````