I don't know if it just me that the dropdown button for the country is a little bit lagging when I clicked it (I'm using chrome btw), anyway I like the UI it is very simple and clean. I just wanna suggest some features that maybe people can log in to your site and give some feedback about the exchange, so other people can get information and review from users about the exchange that they're looking for.
I was actually thinking about adding user reviews and ratings so that other people can benefit from others experiences'. Definitely a priority. It's a bit laggy due to asset caching (Something I need to do on my end, not yours).