NIPs nostr improvement proposals

NIP-99 - Classified Listings

Table of Contents

Classified Listings

draft optional

This NIP defines kind:30402: a parameterized replaceable event to describe classified listings that list any arbitrary product, service, or other thing for sale or offer and includes enough structured metadata to make them useful.

The category of classifieds includes a very broad range of physical goods, services, work opportunities, rentals, free giveaways, personals, etc. and is distinct from the more strictly structured marketplaces defined in NIP-15 that often sell many units of specific products through very specific channels.

The structure of these events is very similar to NIP-23 long-form content events.

Draft / Inactive Listings

kind:30403 has the same structure as kind:30402 and is used to save draft or inactive classified listings.


The .content field should be a description of what is being offered and by whom. These events should be a string in Markdown syntax.


The .pubkey field of these events are treated as the party creating the listing.


The following tags, used for structured metadata, are standardized and SHOULD be included. Other tags may be added as necessary.

price examples

Other standard tags that might be useful.

Example Event

"kind": 30402,
"created_at": 1675642635,
// Markdown content
"content": "Lorem [ipsum][nostr:nevent1qqst8cujky046negxgwwm5ynqwn53t8aqjr6afd8g59nfqwxpdhylpcpzamhxue69uhhyetvv9ujuetcv9khqmr99e3k7mg8arnc9] dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.\n\nRead more at nostr:naddr1qqzkjurnw4ksz9thwden5te0wfjkccte9ehx7um5wghx7un8qgs2d90kkcq3nk2jry62dyf50k0h36rhpdtd594my40w9pkal876jxgrqsqqqa28pccpzu.",
"tags": [
["d", "lorem-ipsum"],
["title", "Lorem Ipsum"],
["published_at", "1296962229"],
["t", "electronics"],
["image", "", "256x256"],
["summary", "More lorem ipsum that is a little more than the title"],
["location", "NYC"],
["price", "100", "USD"],
"pubkey": "...",
"id": "..."