Currently platform supports:
Kraken (BTC/USD, BTC/EUR)
Bitstamp (BTC/USD)
Bitfinex (BTC/USD , no support for swaps yet)
BTC-e (BTC/USD, BTC/EUR)
Cryptsy (BTC/USD, DOGE/BTC, DRK/BTC, LTC/BTC, RDD/BTC, VTC/BTC, NXT/BTC, PPC/BTC, GLD/BTC)
BTCChina (BTC/CNY, LTC/CNY, LTC/BTC)
The API is based on Javascript. It enables you to use ta-lib based indicators and gives visibility to orderbook (top20 bids/asks). Also supports multiple currency pairs in single trader (easier arbitrage).
Things we're going to add next: More currency pairs and markets (including futures) Real-time (low-latency) trading.
It was under testing for some time now - we need your help and feedback to get further. Therefore all paid subscriptions priced $1/month. And if $1 sounds too much there is a free of charge subscription type to be used for strategy back-testing
Again would appreciate any feedback.