Yeah this is ridiculous, basically all the exchanges I've checked so far allow to choose the "product" (where product can be BTC/EUR, BTC/USD, BTC/GBP etc.), I mean I can deposit some money and then decide how to trade it, some exchanges like bitstamp allow even to trade cryptos between cryptos. GDAX posted numerous articles regarding its platform and BTC trade in general. Although some might view FAQ section a bit lacking, there are numerous articles on the support page to cover it. Simply go to “GDAX Support”, and you will find answers regarding several topics, including trading, financing and account management. Find the current Bitcoin US Dollar Bitfinex rate and access to our BTC USD converter, charts, historical data, news, and more.