you can certainly get most realtime market data for equities and derivatives exchanges but its not overly cheap or hobbyist tier by any means. for example dtn

you can certainly get most realtime market data for equities and derivatives exchanges but its not overly cheap or hobbyist tier by any means. for example dtn iqfeed is around over $100/m w realtime equities and futures, and really high quality data so depending on your focus (esp single segments) the data is very workable. but not many tools let your arbitrarily plugin various data providers