> ## Documentation Index > Fetch the complete documentation index at: https://docs.kairos.trade/llms.txt > Use this file to discover all available pages before exploring further. # Live game pairings between Polymarket and Kalshi > Cross-references currently-live Polymarket games against currently-live Kalshi games, grouped by a Kalshi-league -> Polymarket-sport crosswalk and matched via a multi-step heuristic (ticker-code match, team-name/alias substring match, derived-code prefix match, letter-subset fallback). **Price scale note:** Kalshi market prices in the `kalshiMarkets` array are rescaled to a 0-100 range (not the 0-1 scale used elsewhere in this API) to match a legacy response shape. Falls back to a recent last-known-good snapshot if the live Kalshi data is unavailable. Responses are cacheable. ## OpenAPI ````yaml /openapi/data-api.yaml get /sports/poly-kalshi-pairings openapi: 3.1.0 info: title: Kairos Data API version: 1.0.0 summary: >- The full Kairos data plane — markets, candles, trades, search, discover, sports, trader analytics, and PnL. description: | The Kairos Data API at `data.kairos.trade` is the platform's primary data plane: market metadata and prices, OHLCV candles, live venue trade proxies, normalized trade history, full-text search, discovery feeds, the sports catalog, public trader analytics, and account PnL. ## Authentication Most endpoints accept a Kairos **API key** (`X-Client-Id` + `X-Api-Key` + `X-Api-Secret`, all three) or a first-party session JWT. Endpoints tagged `public` (trader analytics, provider configs, several sports feeds) need no credentials at all. Some endpoints additionally require an API-key **scope** (`trade:read`, `position:read`) — stated per operation. For high-volume market-data consumption (candles/trades/metadata at scale), prefer the dedicated **Market Data API** at `md.kairos.trade` — it has higher budgets, ETag caching, and a binary candle format. ## Rate limits Rate limits use a sliding window keyed on the authenticated user (JWT `sub`) or, for anonymous callers, the trusted client IP. Routes belong to a named **bucket** (`x-kairos-bucket`) whose per-minute budget is shared by every route in it; routes with no bucket run under the service default of 100/minute. `x-kairos-rate-limit` states the bucket's compile-time default — operators can raise or lower a bucket at runtime, so treat the documented number as the baseline, not a contract. 429 responses carry `Retry-After` and `X-RateLimit-*`. ## Conventions - Prices are on the **0–100 cents scale** unless a field says otherwise (trader-analytics position/trade prices use the 0–1 scale; each field's description states its scale). - Errors: `{"detail": ""}` for handler errors; FastAPI's standard validation envelope for 422s. Errors surfaced from a venue adapter instead use `{"error", "provider", "operation", "message"}` — see `DataProviderError`. Unhandled failures always return the generic 500 body; internal details are logged, never returned. - Every request body is capped at 8 MiB service-wide (413). contact: name: Kairos url: https://app.kairos.trade/docs/api-reference termsOfService: https://kairos.trade/terms servers: - url: https://data.kairos.trade description: Production - url: https://staging-data.kairos.trade description: Staging security: - apiKeyClientId: [] apiKeyKey: [] apiKeySecret: [] paths: /sports/poly-kalshi-pairings: get: tags: - Sports summary: Live game pairings between Polymarket and Kalshi description: >- Cross-references currently-live Polymarket games against currently-live Kalshi games, grouped by a Kalshi-league -> Polymarket-sport crosswalk and matched via a multi-step heuristic (ticker-code match, team-name/alias substring match, derived-code prefix match, letter-subset fallback). **Price scale note:** Kalshi market prices in the `kalshiMarkets` array are rescaled to a 0-100 range (not the 0-1 scale used elsewhere in this API) to match a legacy response shape. Falls back to a recent last-known-good snapshot if the live Kalshi data is unavailable. Responses are cacheable. operationId: getSportsPolyKalshiPairings responses: '200': description: Matched Polymarket <-> Kalshi live game pairs. headers: Cache-Control: schema: type: string example: public, max-age=10 content: application/json: schema: $ref: '#/components/schemas/SportsPolyKalshiPairingsResponse' '429': $ref: '#/components/responses/DataRateLimited' security: [] components: schemas: SportsPolyKalshiPairingsResponse: type: object required: - pairings properties: pairings: type: array items: $ref: '#/components/schemas/SportsPolyKalshiPairing' SportsPolyKalshiPairing: type: object required: - polyGameId - polySport - kalshiEventTicker - kalshiLeague - kalshiMilestoneId - kalshiMarkets properties: polyGameId: type: string example: '10078222' polySport: type: string example: mlb kalshiEventTicker: type: string example: KXMLBGAME-26JUN041410SFMIL kalshiLeague: type: string example: MLB kalshiMilestoneId: type: string example: MILESTONE-4521 kalshiMarkets: type: array items: $ref: '#/components/schemas/SportsKalshiFlattenedMarket' SportsKalshiFlattenedMarket: type: object required: - ticker - title - yes_sub_title - price - volume - image - eventTicker properties: ticker: type: string example: KXMLBGAME-26JUN041410SFMIL-SF title: type: string example: Giants at Brewers yes_sub_title: type: string example: Giants win price: type: number format: double description: >- Rescaled to a 0-100 range (not the 0-1 scale used elsewhere in this API), matching a legacy response shape. example: 46.5 volume: type: number format: double example: 12045 image: type: - string - 'null' eventTicker: type: string example: KXMLBGAME-26JUN041410SFMIL responses: DataRateLimited: description: > Rate limit exceeded for this route's sliding window, keyed on the session `sub` when authenticated and on the trusted client IP otherwise. Honor `Retry-After`. A per-API-key data ceiling (set per credential) rejects with `{"detail": "API key data rate limit exceeded"}` instead of the `error` envelope below. headers: Retry-After: schema: type: integer X-RateLimit-Limit: schema: type: integer X-RateLimit-Remaining: schema: type: integer X-RateLimit-Reset: schema: type: integer content: application/json: schema: type: object properties: error: type: string example: 'Rate limit exceeded: 100 per 1 minute' securitySchemes: apiKeyClientId: type: apiKey in: header name: X-Client-Id description: >- Credential client id (`kairos_ck_...`). Must be sent together with X-Api-Key and X-Api-Secret. apiKeyKey: type: apiKey in: header name: X-Api-Key description: 64-char hex API key. apiKeySecret: type: apiKey in: header name: X-Api-Secret description: 64-char hex API secret. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.