Hi there.
Didn't find any topic about digital currencies for Merchants. The idea is simple - who are developing such kind of currencies for merchants needs. I'm not a developer but looks like it must have POS integration SDK and be fast enough to pay for cup of coffee in a second. Of course free or low fees prefered, merchants will choose them. What do you think what other features it should have?

Currently i know only few:
Pundi X
Nano