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Websocket Market Streams

  • The connection method for Websocket is：

    • Base Url: wss://fstream.binance.com
    • Streams can be access either in a single raw stream or a combined stream
    • Raw streams are accessed at /ws/<streamName>
    • Combined streams are accessed at /stream?streams=<streamName1>/<streamName2>/<streamName3>
    • Example:
    • wss://fstream.binance.com/ws/bnbusdt@aggTrade
    • wss://fstream.binance.com/stream?streams=bnbusdt@aggTrade/btcusdt@markPrice

  • Combined stream events are wrapped as follows: {"stream":"<streamName>","data":<rawPayload>}

  • All symbols for streams are lowercase

  • A single connection is only valid for 24 hours; expect to be disconnected at the 24 hour mark

  • The websocket server will send a ping frame every 3 minutes. If the websocket server does not receive a pong frame back from the connection within a 10 minute period, the connection will be disconnected. Unsolicited pong frames are allowed(the client can send pong frames at a frequency higher than every 15 minutes to maintain the connection).

  • WebSocket connections have a limit of 10 incoming messages per second.

  • A connection that goes beyond the limit will be disconnected; IPs that are repeatedly disconnected may be banned.

  • A single connection can listen to a maximum of 200 streams.

  • Considering the possible data latency from RESTful endpoints during an extremely volatile market, it is highly recommended to get the order status, position, etc from the Websocket user data stream.