That's cool and all, but I trade so rarely that $10 a month would cost me more than my current brokerage (TD Ameritrade). If you re-balance anually, and only hold a handful of different stocks, it's easy to keep trading costs below $120/year.

But, I guess one of the reasons I never tinkered with algorithmic trading was the cost per-transaction. So, maybe it's a good thing this didn't exist when I first read about algorithmic trading, as I might have actually tried it.