Is there a exchange or trading products WP theme?

So I’m a enamel pin collector as is my whole family. So we had this idea for a trading site where you can trade products instead of buying them? I’ve used every word for trading and I haven’t found anything.

Clarification on idea of theme:
Say you have a pin (product) and you want to trade with another pin (another product) you can request trade and the person that was sent the request for trade can either deny or accept that trade.

Let me know if this there is something like this or if someone would like to design something like this.