I have been looking at crypto-currenceis much more. I buy and sell bitcoin through coinbase.com This is another currency pair that can be traded. I obviously do it with a "fun money" account. This is not a gamble, but a quick trade with small values that I don't mind losing. Just an FYI
You can buy and trade ETH, BTC, and LTC at Bitfinex. Use this link for a discount on trading fees bitfinex.com/?refcode=cgSJVGkGHV or when you sign up write in cgSJVGkGHV when it asks for a referral code. Good luck and happy trading