> ## 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. # Get Price-to-Beat (PTB) values for crypto up/down contracts > Returns the oracle price captured at the start of each requested window ("the price to beat"), nested `{window: {symbol: {...}}}`. `windows` is comma-separated; each must be one of `1m, 5m, 15m, 1h, 4h, 1d`. Window starts align to clean ET boundaries. Only **window** PTB sources are accepted: `binance`, `kalshi_cfbenchmarks`, `polymarket_twap30`, `polymarket_twap60`. Contract-tick series (`polymarket_chainlink`, `hyperliquid_mark`) are not window benchmarks and are rejected. When `source` is omitted, the server picks Binance or a legacy TWAP series from the `oracle_twap_feed` flag. Binance may fall back to an external market-data source for missing symbols; venue series do not. Symbols with no resolvable price for a window are **omitted** (not `null`). ## OpenAPI ````yaml /openapi/data-api.yaml get /markets/crypto/ptb 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: /markets/crypto/ptb: get: tags: - Markets summary: Get Price-to-Beat (PTB) values for crypto up/down contracts description: | Returns the oracle price captured at the start of each requested window ("the price to beat"), nested `{window: {symbol: {...}}}`. `windows` is comma-separated; each must be one of `1m, 5m, 15m, 1h, 4h, 1d`. Window starts align to clean ET boundaries. Only **window** PTB sources are accepted: `binance`, `kalshi_cfbenchmarks`, `polymarket_twap30`, `polymarket_twap60`. Contract-tick series (`polymarket_chainlink`, `hyperliquid_mark`) are not window benchmarks and are rejected. When `source` is omitted, the server picks Binance or a legacy TWAP series from the `oracle_twap_feed` flag. Binance may fall back to an external market-data source for missing symbols; venue series do not. Symbols with no resolvable price for a window are **omitted** (not `null`). operationId: getCryptoPriceToBeat parameters: - name: windows in: query required: false schema: type: string default: 15m description: >- Comma-separated windows. Each must be one of 1m, 5m, 15m, 1h, 4h, 1d. example: 5m,15m - name: source in: query required: false schema: type: string enum: - binance - kalshi_cfbenchmarks - polymarket_twap30 - polymarket_twap60 description: | ET-aligned window source. New market clients should pass this explicitly. TWAP30 remains for legacy 1m overlays. example: kalshi_cfbenchmarks responses: '200': description: PTB values nested by window then symbol. content: application/json: schema: $ref: '#/components/schemas/MarketsPtbResponse' '400': description: No windows given, or an invalid window value. content: application/json: schema: type: object properties: detail: type: string example: >- Invalid window: 30m. Must be one of: ['15m', '1d', '1h', '1m', '4h', '5m'] '401': $ref: '#/components/responses/DataUnauthorized' '403': $ref: '#/components/responses/DataForbidden' '422': $ref: '#/components/responses/DataValidationError' '429': $ref: '#/components/responses/DataRateLimited' '500': description: Oracle store/source lookup failed for one or more windows. content: application/json: schema: type: object properties: detail: type: string example: Failed to fetch price-to-beat values components: schemas: MarketsPtbResponse: type: object description: Keyed by window (1m/5m/15m/1h/4h/1d), each value keyed by symbol. additionalProperties: $ref: '#/components/schemas/MarketsPtbWindowValues' MarketsPtbWindowValues: type: object description: >- Keyed by oracle symbol (btc-usd/eth-usd/sol-usd/xrp-usd). A symbol is omitted entirely if no price could be resolved for this window. additionalProperties: $ref: '#/components/schemas/MarketsPtbValue' DataError: type: object description: Handler error envelope (FastAPI HTTPException). required: - detail properties: detail: type: string description: Human-readable error message. example: Invalid provider MarketsPtbValue: type: object required: - price - timestamp_ms - game_start_ms properties: price: type: number example: 97000.5 timestamp_ms: type: integer description: >- Actual epoch-ms timestamp of the oracle sample used (may differ slightly from game_start_ms). game_start_ms: type: integer description: Epoch-ms start of the requested window (the "price to beat" anchor). responses: DataUnauthorized: description: > No valid credential presented — missing/invalid API-key headers, or an invalid/expired session token. content: application/json: schema: $ref: '#/components/schemas/DataError' example: detail: Not authenticated DataForbidden: description: > Authenticated but not permitted. Three distinct causes: the session user is not invited (`Invite required`), the API key lacks the operation's scope, or API-key access to the requested venue is switched off (`API access is disabled for `). Admin and API-key callers bypass the invite check; session and admin callers bypass scope and venue checks. content: application/json: schema: $ref: '#/components/schemas/DataError' example: detail: Invite required DataValidationError: description: Request failed FastAPI parameter validation. content: application/json: schema: type: object required: - detail properties: detail: type: array description: >- One entry per failed field, with location, message, and error type. items: type: object additionalProperties: true 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.