> ## Documentation Index > Fetch the complete documentation index at: https://docs.dexpaprika.com/llms.txt > Use this file to discover all available pages before exploring further. # Stream real-time prices for multiple assets > Establishes a multiplexed SSE stream for up to 25 token price subscriptions in a single connection. **Emitted events:** `token_price` · `ping` · `warning` · `error` ## OpenAPI ````yaml /streaming/api-streaming.yml post /sse/prices openapi: 3.1.0 info: title: DexPaprika Streaming API version: 1.0.1 license: name: UNLICENSED identifier: UNLICENSED description: > The DexPaprika Streaming API delivers real-time updates for token prices, swap transactions, and pool reserves over Server-Sent Events (SSE). ## Rate Limits - **Concurrent SSE streams per IP:** 10. Excess returns `429` with `{"message": "ip stream limit exceeded"}`. - **Assets per `POST /sse/prices`:** 25. Excess returns `400` with `{"message": "too many assets, max 25 allowed"}`. - **Request body on `POST /sse/prices`:** 256 KB. Excess returns `413 Payload Too Large`. - **Request rate (per IP x path x method):** 60 req / 60 s. Excess returns `429` with `{"message": "you have reached maximum request limit"}`. ## HTTP Response Codes - `200` — SSE connection established. - `400` — Invalid request (bad params, unknown chain, unknown asset, or asset cap exceeded). - `413` — Request body exceeds the route limit. - `429` — Per-IP stream limit, per-route rate limit, or global stream slot pool exhausted. - `503` — Service saturated (concurrent in-flight cap reached). ## SSE Event Format Events conform to the W3C SSE specification. Non-system events on multiplexed streams include an optional `request_id` line for correlating events to subscriptions: ``` event: [event_name] request_id: [request_id] data: [json_payload] ``` ## Event Types - `token_price` (`PriceResponse`) — Real-time price update. - `ping` (`PingEvent`) — Heartbeat sent every 15 s. Treat absence for >30 s as a potential connection problem. - `warning` (`WarningEvent`) — Non-fatal notice (e.g. partial subscription accepted). - `error` (`ErrorEvent`) — Terminal stream-level error sent before connection close. ## Error Message Catalog 400 errors: - `at least one asset is required` - `invalid method` - `unsupported chain` - `asset not found` - `too many assets, max 25 allowed` 429 errors: - `ip stream limit exceeded` - `Cannot create new subscriptions, global stream limit exceeded` - `you have reached maximum request limit` 503 errors: - `Too many concurrent requests` ## Deprecation The `/stream` path is deprecated and scheduled for decommissioning — migrate to `/sse/prices`. See the deprecated `/stream` operations below for migration guidance. servers: - url: https://streaming.dexpaprika.com description: Production Streaming Gateway security: [] paths: /sse/prices: post: summary: Stream real-time prices for multiple assets description: > Establishes a multiplexed SSE stream for up to 25 token price subscriptions in a single connection. **Emitted events:** `token_price` · `ping` · `warning` · `error` operationId: streamBatchAssetPrices parameters: - name: limit in: query required: false schema: type: integer minimum: 1 description: >- Close the stream after this many total events. Omit for an indefinite stream. requestBody: required: true content: application/json: schema: type: array maxItems: 25 description: List of assets to subscribe to. Maximum 25 items. items: $ref: '#/components/schemas/AssetPriceRequest' responses: '200': description: Multiplexed SSE stream established. content: text/event-stream: schema: oneOf: - $ref: '#/components/schemas/PriceResponse' - $ref: '#/components/schemas/PingEvent' - $ref: '#/components/schemas/WarningEvent' - $ref: '#/components/schemas/ErrorEvent' '400': description: >- Invalid request (unknown chain, unknown asset, invalid method, or too many assets). content: application/json: schema: $ref: '#/components/schemas/ErrorEvent' '413': description: Request body exceeds the 256 KB route limit. '429': description: Per-IP stream limit or rate limit exceeded. content: application/json: schema: $ref: '#/components/schemas/ErrorEvent' '503': description: Service saturated — too many concurrent streams. content: application/json: schema: $ref: '#/components/schemas/ErrorEvent' components: schemas: AssetPriceRequest: type: object required: - chain - address - method description: Subscription item for `POST /sse/prices`. properties: chain: type: string description: Blockchain network identifier. example: ethereum address: type: string example: '0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D' description: Token smart contract address. method: type: string enum: - token_price description: Streaming method. Only `token_price` is accepted on `/sse/prices`. request_id: type: integer minimum: 0 maximum: 4294967295 description: >- Optional identifier echoed on each event for this subscription. Defaults to the array index if omitted. filter: type: object PriceResponse: type: object description: Price update payload. Delivered on the `token_price` event channel. properties: address: type: string description: Token smart contract address. example: '0x7a250d5630b4cf539739df2c5dacb4c659f2488d' chain: type: string description: Blockchain network identifier. example: ethereum price: type: string description: Token price in USD. example: '3456.78' timestamp: type: string description: Server ingestion timestamp (ISO 8601). example: '2024-05-08T10:00:00Z' timestamp_price: type: string description: On-chain or oracle price timestamp (ISO 8601). example: '2024-05-08T09:59:58Z' token_price: type: string description: Alias for `timestamp_price`. example: '2024-05-08T09:59:58Z' PingEvent: type: object description: Heartbeat sent every 15 s to keep the connection alive. properties: time: type: integer description: Unix epoch seconds at the time of the ping. example: 1715162400 WarningEvent: type: object description: >- Non-fatal notice sent over the stream without closing it (e.g. a partial subscription was accepted). properties: message: type: string description: Human-readable warning description. example: stream is deprecated, move to /sse/prices instead ErrorEvent: type: object description: >- Terminal error sent before the server closes the stream. Also used as the body for 4XX/5XX HTTP error responses. properties: message: type: string description: >- Human-readable error description. See the Error Message Catalog in the overview for the full list of stable values. example: asset not found ````