Which US banks offer foreign currency exchange?

As a cryptocurrency and finance enthusiast, I'm curious about traditional banking options for foreign currency exchange. Could you please elaborate on which US banks provide this service? I'm particularly interested in knowing if they offer competitive exchange rates, as well as any associated fees or charges. Additionally, it would be helpful to know if these banks have a user-friendly online platform or mobile app that allows for easy currency conversions. Your insights would greatly assist me in making an informed decision for my financial needs.