I just checked on etherdelta but I can't find there the XRP. Does it have a different token name on etherdelta? As what I read on their whitepaper, it says that they soon have their own decentralized and centralized exchanges which will both allow traders to trade XPR to fiat currency and different cryptocurrencies.
Yes, Polaris will have its own exchange which is actually another good business to go into as the top 5 cryptocurrency exchanges are actually raking in millions in profits annually and there are now many big investors entering the same market. Polaris can be a good player on this market. This is an exciting project to get as it is not just limiting itself to mining.