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)