npub.world, nostr:nprofile1qqs83nn04fezvsu89p8xg7axjwye2u67errat3dx2um725fs7qnrqlgzqtdq0 are using it in production, and others are integrating it right now (like Olas by nostr:nprofile1qqs04xzt6ldm9qhs0ctw0t58kf4z57umjzmjg6jywu0seadwtqqc75spp4mhxue69uhkvdm69e5k7tcprfmhxue69uhhq7tjv9kkjepwve5kzar2v9nzucm0d5hsm6qvpk I think)