I'll just jump in here and cheekily plug my service: http://tradewave.net http://tradewave.net There are a lot of people building trading bots for cryptocurren

I'll just jump in here and cheekily plug my service: http://tradewave.net http://tradewave.net There are a lot of people building trading bots for cryptocurrencies, and it's pretty easy to get started by yourself. But not everyone has the chops or patience to do it well; for example gathering, aggregating and storing data across the various exchanges is a huge pain. So my site abstracts away that stuff. You can't do real HFT with Bitcoin (and others) as the infrastructure just isn't there yet. The lowest I've heard is 15-30 second trades and even that's rare. Most people go for 1-2 hours.