API for scanning top gainers over x mins/hours / etc

Does anybody have a favorite scanner they use to find the top gainers over a certain period of time (to screen for things to look at)? I've used the alpaca and yahoo API's pretty heavily, but only to look at individual stocks. I've swept 10k stocks, too - but that seems like an abuse of their API and not the best way to tackle the challenge of finding the movers. Any advice?