Kraken

Based in San Francisco, Kraken is a bitcoin exchange in euro volume and liquidity that trades various currencies, including Canadian dollars, US dollars, British pounds, and Japanese yen. It is known as the first to have trading price and volume displayed on the Bloomberg terminal as well as to pass a cryptographically verifiable proof-of-reserves audit. Its clientele is comprised of numerous traders, Tokyo government's court-appointed trustee, and Germany's BaFin regulated Fidor Bank. Its fee schedules are tier-based and fees are charged on a per-trade basis. Kraken is also in partnership with the first cryptocurrency bank.