Nemchange, a cryptocurrency exchange for buying and selling NEM based tokens called mosaics has been launched. It runs on NEM blockchain – just like ERC20 tokens run on ethereum blockchain. You can trade any mosaics created on Nemchange. Right now, Nemchange does not allow you to trade non-NEM tokens and cryptocurrencies (other than NEM) but team has plans to add support for some of the most popular ones in future.