The simplest is really simple, and it is small and autonomous.

We have an exchange circle locally where we trade stuff we have to much from our gardens and things we don't need anymore.

This can comepletely be fired by using nostr:npub1hcwcj72tlyk7thtyc8nq763vwrq5p2avnyeyrrlwxrzuvdl7j3usj4h9rq for example beeing on Lightning by default. In this case we eould have a high turnover of sats with a small totsll amount of sats used. There would not be the need to get of lightning.