Try www.iqfeed.net up to 2500 tickers.
hmm...just found out that IB's imbalance is only total imbalance, not actual market imbalance.
anybody knows where to get market imbalance?
I found this: https://marketchameleon.com/Reports/StockOrderImbalanceReport it says 15 minutes delayed so useless. I wonder if you are a paid subscriber, you would get realtime.
