Seems like reinventing OpenBazaar. (https://github.com/openbazaar) All that code is just sitting there on Github with no love today because the stupid shitcoin-friendly devs used some altcoins too.

Here's hoping you find a lot of their code easy to plug into your market!

This is a nostr marketplace

Nostr apps require front-ends. The UX front, including tons of artwork, over at OpenBazaar is 2nd to none. Just gorgeous. Surely some of that is scroungable for this client.