Bittrex is one of the largest Crypto to Crypto exchanges, which offer a large number of trading pairs into Bitcoin. As well as dealing with all of the major cryptocurrencies, such as Darkcoin, Nextcoin and Litecoin, they also offer Neucoin and Ethereum. They provide both individuals and businesses with a platform in which to buy and sell these and other digital tokens. Bittrex has a very high turn over rate of cryptocurrencies, which has led to some negative attention and confidence in the crypto currency ecosystem as a whole. However, Bittrex exchange in based in the United States, have very good security features, including a two-factor authentication for their customers to ensure that all of their transactions remain safe and secure.