Introducing Promobeez: barter marketing for local businesses

Hey Indie Hackers! We're building Promobeez, a barter marketplace connecting local Helsinki businesses with nano and micro creators. Businesses post an offer (a meal, service, or product) instead of paying cash, and local creators apply to promote it in exchange. No money changes hands.

We're currently testing with a handful of Helsinki businesses and would love feedback from other indie hackers who've built local marketplaces or two-sided platforms. What worked for you when bootstrapping supply and demand at the same time?