Cute project, but since it isn't actually hooked up to live trading, I'm going to suspect that they're not actually dealing with the issues which would keep the

Cute project, but since it isn't actually hooked up to live trading, I'm going to suspect that they're not actually dealing with the issues which would keep them from making a profit on those trades: trading fees, losses going into the bid-ask spread, the fact that large enough purchases actually move the market, and the fact that the crash which wipes you out can come along on years later just when the victories of the past few years made you think you had everything figured out. Simulated trading is all well and good for the long-term buy-and-hold sort of trading where you can assume you're a medium-small-sized fish in a huge pond and these errors are inconsequential, but with ultra-short-term trading like this the texture of the market matters a lot more. That said, if you're a day trader of some sort trying to compete with the task the rat has been assigned to do, there's a very much elevated chance that you're in the wrong business.