aster-api-spot-websocket-v1

name	aster-api-spot-websocket-v1
description	WebSocket market + user data streams for Aster Spot API v1. Subscription model, stream names, listenKey (/api/v1/listenKey). Use when implementing real-time spot market or user events. listenKey = USER_STREAM; see aster-api-spot-auth-v1.

Aster Spot API WebSocket (v1)

Base: wss://sstream.asterdex.com. Raw: /ws/<streamName>. Combined: /stream?streams=name1/name2/... → {"stream":"<name>","data":<payload>}. Stream names lowercase (e.g. btcusdt).

Limits: Connection 24h; ping every 5 min → pong within 15 min; 5 msg/s; max 1024 streams.

Market: subscribe / unsubscribe

JSON: Subscribe {"method":"SUBSCRIBE","params":["btcusdt@aggTrade","btcusdt@depth"],"id":1} → {"result":null,"id":1}. Unsubscribe: UNSUBSCRIBE + params. List: LIST_SUBSCRIPTIONS.

Stream names (market)

Stream	Description
<symbol>@aggTrade	Aggregate trades
<symbol>@trade	Tick-by-tick trades
<symbol>@kline_<interval>	Kline (e.g. 1m, 1h)
<symbol>@depth, @depth@100ms	Diff. book depth (1000ms or 100ms)
<symbol>@miniTicker	24h mini ticker
!miniTicker@arr	All mini tickers
<symbol>@ticker	24h ticker
!ticker@arr	All tickers
<symbol>@bookTicker	Best bid/ask
!bookTicker	All book tickers

User data stream (USER_STREAM)

1. Start: POST /api/v1/listenKey → { "listenKey": "..." } (existing key extended 60 min). API key in header.
2. Connect: wss://sstream.asterdex.com/ws/.
3. Keepalive: PUT /api/v1/listenKey with listenKey (e.g. every 30 min).
4. Close: DELETE /api/v1/listenKey with listenKey.

Events: outboundAccountPosition (balance), executionReport (order update).

Order book sync (depth)

1. Subscribe to <symbol>@depth; buffer events.
2. Snapshot: GET /api/v1/depth?symbol=SYMBOL&limit=1000.
3. Discard events with u ≤ lastUpdateId; first valid: U ≤ lastUpdateId+1 and u ≥ lastUpdateId+1.
4. Each event: pu = previous u; else re-sync. Qty absolute; 0 = remove level.

Payload shapes: reference.md.