Bitstamp is a bitcoin exchange based in Luxembourg. As of 2016 it was the world’s second largest by volume. It allows trading between USD currency and bitcoin cryptocurrency. It allows USD, EUR, bitcoin or Ripple deposits and withdrawals.
The company was founded as a European-focused alternative to then-dominant bitcoin exchange Mt. Gox. While the company trades in US dollars, it allows money to be deposited through the European Union’s Single Euro Payments Area, a convenient way of transferring money between European bank accounts.
Bitstamp offers an API to allow clients to use custom software to access and control their accounts.