I need to check pub.cash, but it seems like they are focused on providing you with a lightning address where people can mint you ecash.
That you can then redeem when back online on your profile, so using ecash as a buffer to get lightning zap on nostr.
Cashu opens a ton of possibility, one I am excited about is nip-61, zap notes from your nostr profile with ecash. Checkout nutsack
