> ## 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 swap transactions for a single pool or token > Establishes an SSE stream for swap transactions on a specific pool or token using query string parameters. **Supported Channel Events:** - `pool`: Swap transactions for a pool. Schema matches `TransactionResponse`. - `token`: Swap transactions involving a token. Schema matches `TransactionResponse`. - `ping`: Infrastructure keep-alive payload (`PingEvent`). - `warning`: System warning notifications (`WarningEvent`). - `error`: Stream-level operational exceptions (`ErrorEvent`). ## OpenAPI ````yaml /streaming/api-streaming.yml get /sse/transactions 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/transactions: get: summary: Stream real-time swap transactions for a single pool or token description: > Establishes an SSE stream for swap transactions on a specific pool or token using query string parameters. **Supported Channel Events:** - `pool`: Swap transactions for a pool. Schema matches `TransactionResponse`. - `token`: Swap transactions involving a token. Schema matches `TransactionResponse`. - `ping`: Infrastructure keep-alive payload (`PingEvent`). - `warning`: System warning notifications (`WarningEvent`). - `error`: Stream-level operational exceptions (`ErrorEvent`). operationId: streamSingleAssetTransactions parameters: - name: method in: query required: true schema: type: string enum: - pool - token description: >- Subscription target type — `pool` for pool-level transactions, `token` for token-level. - name: address in: query required: true schema: type: string description: Target pool or token smart contract address. - name: chain in: query required: true schema: type: string description: Target blockchain network identifier (e.g., `ethereum`, `solana`). - name: request_id in: query required: false schema: type: integer minimum: 0 maximum: 4294967295 description: Optional identifier for tracking the request in the SSE stream. - name: limit in: query required: false schema: type: integer minimum: 1 description: Maximum event count before server-initiated connection teardown. responses: '200': description: SSE stream successfully established. content: text/event-stream: schema: oneOf: - $ref: '#/components/schemas/TransactionResponse' - $ref: '#/components/schemas/PingEvent' - $ref: '#/components/schemas/WarningEvent' - $ref: '#/components/schemas/ErrorEvent' 4XX: description: >- Client error (e.g., invalid parameters, asset not found, or stream limit exceeded). content: application/json: schema: $ref: '#/components/schemas/ErrorEvent' components: schemas: TransactionResponse: type: object description: >- Swap transaction event payload. Emitted on the `pool` or `token` event channel. properties: chain: type: string description: Blockchain network identifier. example: ethereum pool_id: type: string description: Pool smart contract address. example: '0x88e6a0c2ddd26feeb64f039a2c41296fcb3f5640' block_number: type: string description: >- Block number in which the swap was confirmed (string-encoded integer). example: '19000000' block_timestamp: type: string format: date-time description: Block timestamp in RFC 3339 format. tx_hash: type: string description: Transaction hash. example: 0xabc123... sender: type: string description: Address that initiated the swap. example: '0xd3cda913deb6f0967b991b2d0a373199c2f7c90c' recipient: type: string description: Address that received the output tokens. example: '0xd3cda913deb6f0967b991b2d0a373199c2f7c90c' token_0: type: string description: Address of the first token in the pool. example: '0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48' token_1: type: string description: Address of the second token in the pool. example: '0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2' amount_0: type: number description: >- Raw token0 amount from the chain (not decimal-normalised). Negative means tokens left the user's wallet. example: -1000 amount_1: type: number description: >- Raw token1 amount from the chain (not decimal-normalised). Positive means tokens entered the user's wallet. example: 500000000 amount_0_usd: type: number description: >- USD value of token0 amount (decimal-normalised volume × price). Preserves sign from the underlying volume. example: -1000.5 amount_1_usd: type: number description: >- USD value of token1 amount (decimal-normalised volume × price). Preserves sign from the underlying volume. example: 998.75 price_0_usd: type: number description: USD price per one unit of token0 (after decimal normalisation). example: 1.0005 price_1_usd: type: number description: USD price per one unit of token1 (after decimal normalisation). example: 1997.5 volume_usd: type: number description: Estimated USD volume of the swap. example: 999.625 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 ````