Looking to build a real time data feed, stock monitor window. Pretty much the same as equityfeed.com market viewer window, just with a few addedfeatures and or different filter columns with more up to date, current technologies. Any body know what API equity feed uses or an API be a better fit for more real time data than them?
https://Polygon.io has the CTA + UTP + OTC feed.
I think this is what you're asking for. Using WebSockets and REST APIs for historic data. I believe this is what you mean by "current technologies".