This DEX will be the only one available where people can trade BTC and DAI for Monero without KYC on a platform that only charges 0.25%. The cheapest other no-KYC platform for Monero is Bisq, and that charges 0.7%, has a complicated, confusing UI, and requires people to lock up 15% of the value of the trade in BTC.
So if I understand this correctly you are creating dex exchange for trading crypto only, there is no fiat currencies available?
We already have Bisq exchange and HavenoDex (RetoSwap) that have both crypto and fiat trading options.
Making everything from scratch doesn't sound like a good idea when we already have something that works fine.