On this exchange: . The currency are moving fast: which is good for very short term transactions. . High trading volumes . US based company . Very cheap fees . Good UI & tools You can live view the exchange without login here: https://poloniex.com/exchange#bt... However, as of today (may 2017) the website is facing regular slowdown; Caused by an incredible growth rate of new users and the cash that those new users inject. The massive signups is the logical consequence of the bitcoin raising beyond $1500, today at $2200, + all the others cryptocurrency: ETH, ETC, XRP.. "going to the moon" as traders says, hitting x50 their values in a few days. But that's still the one I use, And happy with it =)