True, it's not an L3, because it doesn't handle or modify txs, but it does coordinate and interact with L2 in LN. Forgive my ignorance, but does it play nice with Cashu mints? I wouldn't know how nut zapping would work if everyone's zap addresses are LN, not Cashu wallets. 

 https://Npub.cash is a Cashu wallet that lets every npub have a Lightning address. 

 Whoa! Okay, I'll be looking into this.