> ## 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. # Cross-venue cluster membership for a set of markets > Resolves each `:` reference to its equivalence cluster at the requested tier floor and returns the cluster's other live members. Members listed on a venue whose indexing is switched off, or whose status is settled/closed/resolved, are excluded; a reference whose cluster keeps fewer than two live members after that filter is omitted from the response entirely. Membership is capped at 32 per cluster, with `truncated` and the stored `size` stating what was left out. ## OpenAPI ````yaml /openapi/data-api.yaml get /market-clusters 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: /market-clusters: get: tags: - Markets summary: Cross-venue cluster membership for a set of markets description: > Resolves each `:` reference to its equivalence cluster at the requested tier floor and returns the cluster's other live members. Members listed on a venue whose indexing is switched off, or whose status is settled/closed/resolved, are excluded; a reference whose cluster keeps fewer than two live members after that filter is omitted from the response entirely. Membership is capped at 32 per cluster, with `truncated` and the stored `size` stating what was left out. operationId: getMarketClusters parameters: - name: markets in: query required: true description: >- Comma-separated `:` references, max 200. Only the first colon separates the two parts, so market ids may themselves contain colons. Unparseable and duplicate references are dropped silently. schema: type: string example: 1:0x1234abcd,2:KXNBA-26JAN15-LAL - name: floor in: query description: Tier floor to resolve membership at. schema: type: string enum: - exact - semantic default: exact responses: '200': description: Cluster membership keyed by the requested reference. headers: Cache-Control: schema: type: string example: public, max-age=10 content: application/json: schema: $ref: '#/components/schemas/MarketClustersResponse' '400': description: >- Unknown `floor`, no parseable `:` reference, or more than 200 references. content: application/json: schema: $ref: '#/components/schemas/DataError' '422': $ref: '#/components/responses/DataValidationError' '429': $ref: '#/components/responses/DataRateLimited' '503': description: The cluster store could not be queried. content: application/json: schema: $ref: '#/components/schemas/DataError' example: detail: Cluster store unavailable security: [] components: schemas: MarketClustersResponse: type: object required: - clusters - count - floor properties: clusters: type: object description: > Keyed by the requested `:` reference. A reference with no cluster, or whose cluster has fewer than two live members after filtering, is absent — the map is never padded with empties. additionalProperties: $ref: '#/components/schemas/MarketCluster' count: type: integer description: Number of entries in `clusters`. floor: type: string enum: - exact - semantic DataError: type: object description: Handler error envelope (FastAPI HTTPException). required: - detail properties: detail: type: string description: Human-readable error message. example: Invalid provider MarketCluster: type: object required: - cluster_id - floor - truncated - size - members properties: cluster_id: type: string floor: type: string description: Tier floor this membership was resolved at. enum: - exact - semantic truncated: type: boolean description: True when the cluster holds more members than the 32 returned. size: type: integer description: Cluster size as stored — counts members this response filtered out. members: type: array maxItems: 32 items: $ref: '#/components/schemas/MarketClusterMember' MarketClusterMember: type: object description: >- One market inside a cluster, after the venue allowlist and stale-status filter. required: - provider_id - provider - market_id properties: provider_id: type: integer description: Numeric provider id as stored. provider: type: string description: Provider name resolved from provider_id. example: polymarket market_id: type: string title: type: - string - 'null' ticker: type: - string - 'null' image: type: - string - 'null' icon: type: - string - 'null' expires_at: type: - string - 'null' description: ISO-8601 expiry, null when the venue publishes none. responses: 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.