How to get aggregated Bid/ Ask size for a given symbol?


I am using live stream data with an Unlimited subscription, and I’d like to get the total bid/ask sizes for a given symbol.

When using this

stream = StockDataStream(APIConstants.API_KEY, APIConstants.SECRET_KEY, feed=DataFeed.SIP)

I seem to be getting individual quotes from several exchanges, but I don’t get an aggregated view of all the quotes, and so I don’t know what is the total bid/ ask size.

I have looked at the documentation but did not find a way to get back aggregated quotes rather than individual quotes.

Thanks for your help.