Please please please take a look at linking into Moneypot (MP). I would love to be able to seamlessly transfer my MP funds onto your platform in order to trade opportunistically. Right now I hold a stack of coins on Moneypot, but find myself transferring them out to an exchange (1broker, Bitfinex, etc ...) when I need to put on a trade. Previously I traded on Bitmex, until they stopped servicing US-based customers. :-(  I haven't been able to find a comparable derivatives service since.

*A link/connection to MP will give you immediate access to thousands (?) of potential traders ... perhaps not a bad move once you launch.