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

# Cross-Platform Matches

> Find the same real-world event listed on both Polymarket and Kalshi. Returns matched pairs with confidence scores. Uses semantic matching to detect equivalent markets even when the wording differs.



## OpenAPI

````yaml GET /v1/matching-markets
openapi: 3.1.0
info:
  title: Arbiter
  description: >-
    Unified prediction market API. Aggregates Polymarket and Kalshi into a
    single interface with normalized data, historical trades, OHLCV candles,
    orderbook snapshots, and real-time WebSocket streaming.
  version: 1.0.0
servers: []
security: []
tags:
  - name: Markets
    description: Browse, search, and retrieve prediction markets across all platforms.
  - name: Market Data
    description: Prices, orderbooks, trades, and OHLCV candles for individual markets.
  - name: Events
    description: Markets grouped by real-world events (elections, sports, etc.).
  - name: Cross-Platform
    description: Find the same event across Polymarket and Kalshi.
  - name: Sports
    description: Browse prediction markets by sport and date.
  - name: Wallets
    description: 'Wallet analytics: profile, trades, positions, PnL, activity (Polymarket).'
  - name: Polymarket Native
    description: Raw Polymarket data with platform-specific fields.
  - name: Kalshi Native
    description: Raw Kalshi data with platform-specific fields.
  - name: Whales
    description: Track large trades across all prediction markets.
  - name: Webhooks
    description: Subscribe to events via HTTP POST — trades, whale alerts, price changes.
  - name: WebSocket
    description: Real-time streaming of trades, prices, and orderbook updates.
  - name: Auth
    description: Developer account management and API key authentication.
  - name: System
    description: Health checks and system statistics.
paths:
  /v1/matching-markets:
    get:
      tags:
        - Cross-Platform
      summary: Cross-Platform Matches
      description: >-
        Find the same real-world event listed on both Polymarket and Kalshi.
        Returns matched pairs with confidence scores. Uses semantic matching to
        detect equivalent markets even when the wording differs.
      operationId: get_matching_markets_v1_matching_markets_get
      parameters:
        - name: min_score
          in: query
          required: false
          schema:
            anyOf:
              - type: number
              - type: 'null'
            description: Minimum match score (0-100). High confidence matches are 80+.
            title: Min Score
          description: Minimum match score (0-100). High confidence matches are 80+.
        - name: search
          in: query
          required: false
          schema:
            anyOf:
              - type: string
              - type: 'null'
            description: >-
              Filter matches by keyword (searches both Polymarket and Kalshi
              titles)
            title: Search
          description: >-
            Filter matches by keyword (searches both Polymarket and Kalshi
            titles)
        - name: polymarket_market_slug
          in: query
          required: false
          schema:
            anyOf:
              - type: array
                items:
                  type: string
              - type: 'null'
            description: Find matches for specific Polymarket slugs
            title: Polymarket Market Slug
          description: Find matches for specific Polymarket slugs
        - name: kalshi_event_ticker
          in: query
          required: false
          schema:
            anyOf:
              - type: array
                items:
                  type: string
              - type: 'null'
            description: Find matches for specific Kalshi event tickers
            title: Kalshi Event Ticker
          description: Find matches for specific Kalshi event tickers
        - name: limit
          in: query
          required: false
          schema:
            type: integer
            maximum: 200
            minimum: 1
            default: 50
            title: Limit
        - name: cursor
          in: query
          required: false
          schema:
            anyOf:
              - type: string
              - type: 'null'
            description: Pagination cursor from previous response
            title: Cursor
          description: Pagination cursor from previous response
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MatchingResponse'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
components:
  schemas:
    MatchingResponse:
      properties:
        matches:
          items:
            $ref: '#/components/schemas/MatchedMarket'
          type: array
          title: Matches
        total:
          type: integer
          title: Total
        cursor:
          anyOf:
            - type: string
            - type: 'null'
          title: Cursor
        has_more:
          type: boolean
          title: Has More
          default: false
      type: object
      required:
        - matches
        - total
      title: MatchingResponse
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    MatchedMarket:
      properties:
        polymarket:
          type: object
          title: Polymarket
        kalshi:
          type: object
          title: Kalshi
        score:
          type: number
          title: Score
        confidence:
          type: string
          title: Confidence
      type: object
      required:
        - polymarket
        - kalshi
        - score
        - confidence
      title: MatchedMarket
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
              - type: string
              - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
      type: object
      required:
        - loc
        - msg
        - type
      title: ValidationError

````