Aster API WebSocket (v1)

Base: wss://fstream.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; 10 msg/s; max 200 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. id = unsigned int.

Stream names (market)