Hi @jeremybrady702 - this is exactly my area - dbid.io app is a general C2C marketplace with a search engine and payments in bitcoin and lightning. Its running on bitcoin test net right now.
My experience though has been this multi user functionality is hard to get ging without some proper resources for testing, marketing etc. So I am currently re-focusing my energy on a relaunch of our radicle.art marketplace - removing the marketplace functionality and simplify things down to provenance and digital asset management - similar to @stevenlam.id.blockst post about DAM.
My background is in asset management and auction platforms at a company called bidlogix.net and I’m very keen to build a fully decentralised auction platform at some point but am chasing funding right now in order to stay in the game!
Be very happy to chat about possible collaborations on dbid.io if your interested in helping and sharing app mining rewards? I’m mijoco on blockstack slack if you wanna dm em?
Mike