I have to say it looks quite nice! (Altough I don't like Godaddy SSL certificates )
3 Questions: - What margin are you offering? - When is the API ready (and tested)? - Do you have Unit and Integration tests for your platform?
1. We offer 1 : 5 margin for long and short positions. Anyone can sign up for a margin account. You can try it out with a few dollars first. Everything, including margin calls, is transparent. (It's not yet well documented though.)
2. We will try to release in a week. But can't guarantee anything yet.
3. We use Ruby on Rails. So the answer should be easy to guess. :-)
Ok, fair enough
Just one Hint: If you implement an API keep it as compatbile to Mt.Gox as possible. If not, document it well (especially the return values => give an example what the json return value will look like) The Mt.Gox API Doc is not very good on that.
I have not found information about which are the largest real-time bitcoin exchanges.
I assume the largest of them is Mt. Gox?
But what are the 2nd and 3rd largest? An article about bitomat.pl said it was the 3rd largest market, is that correct? Tradehill doesn't seem to be that big if you look at the available data.