I do like the interface and it's functionality of refreshing every 30 seconds plus the highlighted best rates for buying and selling, however I would like to suggest that, those texts that are highlighted green, should have a grayish dark color instead of white, so it would be much more clearer. Also if you could implement a button that users would be able to get the rates sooner than the normal 30 second, that would be a good option as well.
Also some other exchange additions:
https://www.coinbase.com/https://www.bitfinex.com/
