Kraken cryptocurrency exchange is one of the oldest crypto trading platform which has been in existence since 2011.
Kraken is owned by payword with it's headquarters in San Francisco.
Currently kraken has a trading pair on its platform which has amounted to 227 with a volume of $691million,also attracting international media as it's reputation has gone wide making it one of the leaders when it comes to crypto market.
Hacking or tampering with this medium is very difficult with a strong security put in place such as 2FA verification and gmail verification keeping clients investments safe and secure
It has a low trading fee of about 0.2% which i confirmed personally and also got to confirm it's availability on mobile app.