What's the problem with a trading/marketplace platform? This one is at least a p2p stuff, so perhaps we can avoid exchanges (in many cases) in the future.
god hear you!! exchanges are like a plague
( in the last times ) if we can avoid it, we will be more safe, i wish that people start to understand and use this type of trading platform, we will avoid lot of current problems, others will come yes, but in the end this p2p stuff must be a welcome software for all of us.