Aster Spot API WebSocket (v3 — Testnet)
Base: wss://sstream.asterdex-testnet.com. Raw: /ws/<streamName>. Combined: /stream?streams=name1/name2/... → {"stream":"<name>","data":<payload>}. Stream names lowercase (e.g. asterusdt).
Limits: Connection 24h; 5 msg/s; max 1024 streams.
Market: subscribe / unsubscribe
JSON: Subscribe {"method":"SUBSCRIBE","params":["asterusdt@aggTrade","asterusdt@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 (signed)
- Start: POST /api/v3/listenKey (signed: user, signer, nonce, signature) →
{"listenKey": "..."}. Extends 60 min if valid key exists. - Connect: wss://sstream.asterdex-testnet.com/ws/.
- Keepalive: PUT /api/v3/listenKey with listenKey (e.g. every 30 min). Signed.
- Close: DELETE /api/v3/listenKey with listenKey. Signed.
Events: outboundAccountPosition (balance), executionReport (order update).
Order book sync (depth)
- Subscribe to
<symbol>@depth; buffer events. - Snapshot: GET /api/v3/depth?symbol=SYMBOL&limit=1000.
- Discard events with
u≤ lastUpdateId; first valid:U≤ lastUpdateId+1 andu≥ lastUpdateId+1. - Each event:
pu= previousu; else re-sync. Qty absolute; 0 = remove level.
Payload shapes: reference.md.