From Nostr NIP-99 to the Open Markets Initiative
The work began with open marketplace experiments around Nostr NIP-99, which introduced classified listings as signed Nostr events. The Gamma Market Spec expanded the conversation from publishing listings toward the broader interactions required to complete a real transaction.
Those ideas have developed into the Open Markets Initiative: an effort to connect different kinds of marketplaces through a clear, reusable transaction model. Applications can implement only the parts they need while remaining compatible with other builders, merchants, payment systems, and fulfillment providers.