I think a few others have their coins. I heard signal and telegram have their own coins. But the real race as I see is not the payment system ( I have a bias for btc, but that's just me) but the use case.

Zapping people for fun is all good but will wear thin eventually I imagine. Payment for services and goods is the bomb.

We are seeing paid relays and verification already. Good stuffhappeningg. Marketplaces selling things with nostr integration and physical stores with ordering would be awesome.