NIP-75
Zap goals
NIP-75 defines fundraising or payment goals that can receive zaps. Clients can show progress toward a target and connect contributions to a goal.
NIP-75 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 zap goals, people can move between apps without losing the meaning of what they created.
Read more in the official 75.md NIP document.