NIP-XX: Accommodation Listing Profile for NIP-99 Marketplace Listings

[pats2sats]

Summary

Adds an accommodation marketplace profile for NIP-99 marketplace listings. The proposal keeps accommodation listings on the existing NIP-99 listing event kinds and defines the profile-specific fields clients need for lodging search, rendering, and filtering.

What this defines

• The accommodation marketplace profile tag.
• Accommodation-specific listing tags such as check-in/check-out times and spec details.
• H3-based g location indexing for area search without requiring exact property disclosure.
• Promoted compact tags for efficient relay/client filtering.
• Listing anchor and client behavior guidance for accommodation listings.

Scope

This does not define a new listing event kind. Generic marketplace behavior such as auto-acceptance, negotiability, deposits, dispute periods, and cancellation policy lives in the marketplace listing extension.

[ericfj2140]

The accommodation-specific profile split makes sense. One interoperability boundary still looks underspecified: availability.

This draft defines checkIn, checkOut, and uses minDuration, but it does not say how clients discover host-blocked dates, existing bookings, or otherwise unavailable stay ranges. Could the Scope or Related NIPs section explicitly state whether accommodation availability is expected to use NIP-52 or a companion availability proposal?

NIP-52 kind 31922 already models date-based intervals with inclusive start and exclusive end, and kind 31924 can group calendar events. Reusing those primitives could avoid a second incompatible calendar model, but an accommodation profile would still need to define the listing reference, authoritative publisher, privacy expectations, and how blocked periods relate to committed orders. NIP-52 RSVP events should not by themselves imply booking acceptance.

Even if availability remains out of scope here, an explicit non-goal and pointer would help prevent accommodation clients from inventing incompatible blocked-date tags.