Looks Nice. Do you find yourself trading bitcoin often?
I am unfamiliar with the bitcoin bot atmosphere but I am guessing it isn't a stretch to assume that other bots exist, what made you decide to write your own?
I built this bot during the winter of 2013/14. Back then I remember being able to find open source bots only for cross-exchange arbitrage. What I needed was something simple and purely for speculation (plus for Bitstamp). Nowadays the bot scene might be very different, and also BTC price is much more stable.
Any plans to implement other exchanges?
Not at the moment.
How would you even begin to code such an ambitious undertaking? How do you start? Is there a library that does most of the work?
Cointrol is built for Bitstamp exchange and leverages their REST API [1], so the blockchain-related heavy lifting is done on their end. Besides that, Cointrol relies on a bunch of frameworks (Tornado, Django, Django REST Framework) for DB persistence, HTTP, REST, WebSockets, and such.