Abacus supports Bitcoin (BTC) and Monero (XMR) for payments.

While it does use the traditional account wallet system (meaning you
must first top up your account balance before making a purchase), they
do support Multisig 2/3 payments – an option employed by some vendors.

Vendors with a significant amount of completed sales under their belts
are afforded FE (finalize early) privileges. One of the interesting
things.

Familiar UI, well organized, easy to navigate.