The liquidity from B2Broker covers six popular cryptocurrencies

B2Broker is the latest provider online trading brokerage solutions to turn to cryptocurrency.
Bitcoin, Ethereum, Litecoin, Dash, Peercoin and Namecoin.

Source : http://www.financemagnates.com/cryptocurrency/news/b2broker-now-offers-cryptocurrency-liquidity-metatrader-5-brokers/