Binance Futures allows combined userData streams

[oliver-zehentleitner]

Base Url 2: wss://fstream-auth.binance.com
User Data Streams are accessed at /ws/<listenKey>?listenKey=<validateListenKey>
<validateListenKey> must be a valid listenKey when you establish a connection
Example:
wss://fstream-auth.binance.com/ws/XaEAKTsQSRLZAGH9tuIu37plSRsdjmlAVBoNYPUITlTAko1WI22PgmBMpI1rS8Yh？listenKey=XaEAKTsQSRLZAGH9tuIu37plSRsdjmlAVBoNYPUITlTAko1WI22PgmBMpI1rS8Yh`

Info: https://binance-docs.github.io/apidocs/futures/en/#user-data-streams