ParlayAPI Prediction Markets API

openapi: 3.2.0
info:
  title: Parlay Prediction Markets API
  description: Real-time sports odds aggregation from **33 books and data sources** updated every 2-120 seconds depending on source cadence.
  version: 3.2.0
  x-credit-currency: credits
  x-credit-cost-catalogue-url: /v1/meta/credit-costs
  x-pricing-url: /v1/pricing
  x-usage-url: /v1/usage
  contact:
    name: ParlayAPI support
    url: https://parlay-api.com/support
    email: support@parlay-api.com
  license:
    name: ParlayAPI Terms of Service
    url: https://parlay-api.com/terms
  termsOfService: https://parlay-api.com/terms
servers:
- url: https://parlay-api.com
  description: Production (primary; HTTP/2, TLS 1.3).
- url: https://api.parlay-api.com
  description: Production (high-volume; bypasses Cloudflare edge for trading bots above 30 req/min). Same origin, same auth, same endpoints.
tags:
- name: Prediction Markets
  description: Kalshi and Polymarket prediction-market prices including crypto.
paths:
  /v1/prediction-markets/{sport_key}:
    get:
      summary: Get Prediction Markets
      description: 'Get prediction-market prices (Kalshi + Polymarket). 1 credit.


        Returns one row per (source, market) snapshot from the last hour.

        EXCLUSIVE: not available on the-odds-api.


        Use ?sources=kalshi or ?sources=polymarket to limit to one venue.

        For free-text discovery across Kalshi, Polymarket, and Novig (no

        credit charge), use /v1/event-markets/search instead.


        Responses are cached server-side for 30s; the `X-Cache` header is

        `HIT` or `MISS` so clients can see whether they hit Postgres.'
      operationId: get_prediction_markets_v1_prediction_markets__sport_key__get
      parameters:
      - name: sport_key
        in: path
        required: true
        schema:
          type: string
          title: Sport Key
      - name: sources
        in: query
        required: false
        schema:
          type: string
          description: Comma-separated source keys. Supports kalshi, polymarket. Defaults to both.
          default: kalshi,polymarket
          title: Sources
        description: Comma-separated source keys. Supports kalshi, polymarket. Defaults to both.
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema: {}
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
      x-credit-cost: 1
      x-credit-cost-type: fixed
      x-credit-cost-description: Kalshi + Polymarket prediction markets for a sport
      security:
      - apiKeyHeader: []
      - apiKeyQuery: []
      - bearerAuth: []
      tags:
      - Prediction Markets
  /v1/prediction-markets/crypto/{asset}:
    get:
      summary: Get Crypto Prediction Markets
      description: 'Latest snapshot of every open Kalshi crypto prediction market

        for the requested asset.


        What is currently collected is BTC price ladders: `price_at_or_above`

        (one contract per strike, e.g. `KXBTCD-26AUG0117-T53499.99`, "Bitcoin

        price on Aug 1, 2026?") and `price_range`. ETH is in the archive but

        stopped writing on 2026-07-30, so it is served by the historical

        endpoint and not by this one. Ask for a combination outside the window

        this endpoint queries and you get a 404 naming what is live, with no

        credit charged, rather than a billed empty array.


        Each row shows the latest yes/no bid/ask + mid-market implied

        probability + volume + open interest. Use the historical endpoint

        (`/v1/historical/prediction-markets/crypto/{asset}`) for replay, and

        for any asset that is in the archive but not currently live.


        Cost: 1 credit. Refreshes within ~5s of the underlying collector

        poll.'
      operationId: get_crypto_prediction_markets_v1_prediction_markets_crypto__asset__get
      parameters:
      - name: asset
        in: path
        required: true
        schema:
          type: string
          title: Asset
      - name: market_type
        in: query
        required: false
        schema:
          type: string
          description: 'Filter by market_type. One of: direction_15m, direction_1h, direction_daily, price_range, price_above, all. Default all.'
          default: all
          title: Market Type
        description: 'Filter by market_type. One of: direction_15m, direction_1h, direction_daily, price_range, price_above, all. Default all.'
      - name: limit
        in: query
        required: false
        schema:
          type: integer
          maximum: 500
          minimum: 1
          default: 200
          title: Limit
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema: {}
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
      x-credit-cost: 1
      x-credit-cost-type: fixed
      x-credit-cost-description: Kalshi crypto prediction markets (BTC/ETH/SOL)
      security:
      - apiKeyHeader: []
      - apiKeyQuery: []
      - bearerAuth: []
      tags:
      - Prediction Markets
components:
  schemas:
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
            - type: string
            - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
        input:
          title: Input
        ctx:
          type: object
          title: Context
      type: object
      required:
      - loc
      - msg
      - type
      title: ValidationError
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
  securitySchemes:
    apiKeyHeader:
      type: apiKey
      in: header
      name: X-API-Key
      description: API key passed in the X-API-Key header. Recommended.
    apiKeyQuery:
      type: apiKey
      in: query
      name: apiKey
      description: API key passed as the ?apiKey= query parameter. Useful for browser fetch() and webhooks where header control is limited. Equivalent to X-API-Key.
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: APIKey
      description: 'API key passed via Authorization: Bearer <key>. Equivalent to X-API-Key for compatibility with auth libraries that expect bearer tokens.'