Bitfinex is one of the largest exchanges in terms of daily trading volumes and overall recognition. It was founded in 2012 and it is based in Hong Kong. 72 trading pairs are currently available on the platform. The pairs are linked to the four currencies including USD, EUR, BTC and ETH.
FreiExchange was founded in 2016 in Norway by a team of local enthusiasts aiming to support Freicoin, an old crypto, that is also called “Bitcoin with demurrage”. The trading volume on this platform is rather moderate. As of now, it offers 31 cryptocurrency pairs with Bitcoin as a counter currency.