I tried some few apps and companies also but they were total rip off. Coinbase transacts in many different currencies and does a range of payment methods. Any two of the three keys allows spending of funds. I would definitely advise you to move your crypto from Coinbase once you have bought it, as exchange wallets are the least safe types of wallets. Ray has been really helpful also he is the best to coach you on how to trade properly and you also have full access to your trading account. If Coinbase goes down, you still have both the shared key and your own key. In fact, on GDAX, you will be able to find a bigger selection of cryptos to trade between.