Kraken is one of the largest exchange platforms available in the world. Kraken was first launched in 2011. Currently, the exchange platform supports trading of over 40 cryptocurrencies like Bitcoin, Ethereum, Litecoins, e.t.c. In terms of security, Kraken is an outstanding choice because it has never been hacked before. When I wanted to start trading using this platform, I was a bit skeptical because of its high transaction fees but after using the exchange platform for about 10 months now, I can now tell you that it is worth the fees as you have the assurance that your transaction is safe. I deposit into my Kraken account through wired transfer and Fiat tokens because this exchange does not support credit cards. It can be used through it's website or its app. I'll advice anyone to go for the latter as creating an account was very easy for me and understanding the app was even easier. I strongly believe that despite it's high transaction fees, Kraken remains one of the best exchange platforms in the world.