nostr:npub15dc33fyg3cpd9r58vlqge2hh8dy6hkkrjxkhluv2xpyfreqkmsesesyv6e uses ecash for payments in their nostr-based uncensorsble shop. it's damn good. they are probably responsible for the largest real-world economic Cashu transactions we have so far (I remember a pixel phone being sold via ecash)