This is based on [NIP-402](https://github.com/nostr-protocol/nips/pull/662), which is still a draft, which is for "classified listings that list any arbitrary product, service, or other thing for sale or offer". So lots of room to explore different use cases (how would you use this?). I already added them to Nosta profiles ([example](https://nosta.me/npub1jknfxfjynyc6mk3juls0vf6mas8rs747ae9m26e7jn6x56kyqt3quttcvj)) over the weekend. Really nice how more capabilities are added and the experience gets richer (although, let's not overdo it and create a huge mess).