The biggest exchange for DCN was Bittrex. I don't even know what the requirements have to be met to get there, but I would consider it definitely, as they hosted DCN and even didn't rush to delist it in spite of low volumes. Bleutrade was also very fair. C-cex is a place beter not to visit. Their delisting policy is really disgusting. They list for a while, someone pump&dump, they delist in a rush and even do not allow to withdraw the coins after that, creating artificial panic. Cryptopia is an admirable exchange, but someone have just mentioned their requirements are measured in BTC and these are not the most moderate requirement in the world.