nips/75.md

NIP-75

Zap Goals

draft optional

This NIP defines an event for creating fundraising goals. Users can contribute funds towards the goal by zapping the goal event.

Nostr Event

A kind:9041 event is used.

The .content contains a human-readable description of the goal.

The following tags are defined as REQUIRED.

• amount - target amount in milisats.
• relays - a list of relays the zaps to this goal will be sent to and tallied from.

Example event:

{
  "kind": 9041,
  "tags": [
    ["relays", "wss://alicerelay.example.com", "wss://bobrelay.example.com", /*...*/],
    ["amount", "210000"],
  ],
  "content": "Nostrasia travel expenses",
  // other fields...
}

The following tags are OPTIONAL.

• closed_at - timestamp for determining which zaps are included in the tally. Zap receipts published after the closed_at timestamp SHOULD NOT count towards the goal progress.
• image - an image for the goal
• summary - a brief description

{
  "kind": 9041,
  "tags": [
    ["relays", "wss://alicerelay.example.com", "wss://bobrelay.example.com", /*...*/],
    ["amount", "210000"],
    ["closed_at", "<unix timestamp in seconds>"],
    ["image", "<image URL>"],
    ["summary", "<description of the goal>"],
  ],
  "content": "Nostrasia travel expenses",
  // other fields...
}

The goal MAY include an r or a tag linking to a URL or addressable event.

The goal MAY include multiple beneficiary pubkeys by specifying zap tags.

Addressable events can link to a goal by using a goal tag specifying the event id and an optional relay hint.

{
  "kind": 3xxxx,
  "tags": [
    ["goal", "<event id>", "<Relay URL (optional)>"],
    // rest of tags...
  ],
  // other fields...
}

Client behavior

Clients MAY display funding goals on user profiles.

When zapping a goal event, clients MUST include the relays in the relays tag of the goal event in the zap request relays tag.

When zapping a parameterized replaceable event with a goal tag, clients SHOULD tag the goal event id in the e tag of the zap request.

Use cases

• Fundraising clients
• Adding funding goals to events such as long form posts, badges or live streams