A friend and I recently built a crypto to BTC market arbitrage site called BitDiff. We currently check against Bitfinex, Bittrex, Bitstamp, Coinbase, Kraken, Okcoin, and Poloniex with plans to add more exchanges in the future.
Our August roadmap contains aesthetic and performance overhauls, ETH and USDT markets, and much more! Feel free to follow me here as I will be providing updates as they are available.
Check it out at https://bitdiff.net/ -- any feedback is welcome. :)