You can subscribe to all tickers and all events simultaneously in one WebSocket feed. You can subscribe to all tickers using the “*” character. For example, to subscribe to trades for the entire US equities universe, you can use {“action”:“subscribe”, “params”:“T.*”} You can also use a comma separated list of events + tickers to subscribe to a custom list of tickers/events, such as {“action”:“subscribe”, “params”:“T.AAPL, Q.MSFT, AM.F, A.SPY”} The maximum character limit you can insert in the subscribe message is 1MB worth of characters.