NIP-69
Peer-to-peer orders
NIP-69 describes order events for peer-to-peer trading. It gives apps a common structure for offers, orders, and marketplace coordination.
NIP-69 is one of the small agreements that lets different Nostr apps understand the same kind of activity. In everyday terms, it is like agreeing on the shape of a form: once everyone uses the same form for peer-to-peer orders, people can move between apps without losing the meaning of what they created.
Read more in the official 69.md NIP document.