YOU SHOulD ALSO CHECK ABOUT METAMOROH DEX, IT ALSO A RELAYER DESINED OF DEX ON 0X PROTOCOL , ONLY FEE DEDUCATE WHEN THE SELL OR BUY ORDER EXECUTED NOt FOR CANCEL BUY OR SELL BID , PUT SELL OR BUY BID , IT ALSO GAVE ATOMIC SWEPT PRPOERTY WITH LOTS OF GOOD FEATURE TRADING MORE THAN Eth pair , wbtc pair and metm pair available with all coins. App.Metamorph.pro