• Each account can have up to one concurrent websocket connection.
  • Trades, quotes and minute bars are supported.
  • Subscription is limited to 30 channels at a time for trades and quotes (T. and Q.). This limit is temporary and we may support more channels in the future.
  • There is no limit for the number of channels with minute bars (AM.).
  • Trades and quotes are from the 5 exchanges.
  • Minute bars are also based on the trades in the 5 exchanges.
Market Data - Documentation | Alpaca
Alpaca API lets you build and trade with real-time market data for free.