It's an exchange DAPP for ERC20 token on Ethereum. User can buy/sell token using ETH with ZERO fee except for gas cost. Besides, user is allowed to add and trade any ERC20-compliant token in the exchange.
Beta test is now running on the Ropsten testnet. Please feel free to play with it.https://wanglingsong.github.io/ERC20ExchangeReactUI/
Find source and docs in the github project:https://github.com/wanglingsong/ERC20Exchange