Automatic trading is an automatic occurrence in deed, and many bots are design to respond to news, tweets, and all kinds of things. That said, if you really think you can write a bot that can do really good in the market, why not just make one. For the sake of argument, just assume that you can confirm a trade in 1-5 seconds, make a bot that just does fake trades, give it $10k in fake currency, and let it play.

Come to think about it, such a system, with an API, would be really nice to have. Something that allows anyone to create a trading bot and see how it performs. Any one what to make one? :)