Blocknet is runing a code that makes possible a truly decentraliced exchange between coins the only thing is to add it to the existing codebase and conect to the blocknet node, another posibility is to ask Open Ledger to add this coin, the graphene engine runs at 3000tps and is very reliable, personally i like the exchange a lot but there's not so much liquidity, Qora can provide this liquidity with their user base and OL can benefit for more traffic in the exchange, Blocknet seems like a huge advantage but the problem is that you have to download all the blockchains of coins you wanna trade as if you are the exchange itself, and maybe requires some sort of tech knowlege that most users don´t have.