Actually as platform doesn't have yet supporting bitcoin and Maidsafe, Agoras Tokens, Synereo, Tether and Omni are only supported. If they can atleast add bitcoin-tether trading than it will be nice but it looks like we have to wait for next version release.
Future versions of the OmniDex exchange will seek to include bitcoin and other leading tokens that aren’t built on the Omni protocol.
I have checked another decentralized trading platform with bitcoin-fiat support like bitsquare however it seems they are still in beta testing. Does anyone have experience with bitsquare?