There is some trending / top analytics / zapped on nostr:npub12vkcxr0luzwp8e673v29eqjhrr7p9vqq8asav85swaepclllj09sylpugg https://primal.net/explore but it's not native to the nostr protocol yet.
Discussion
I wonder if curation will eventually be the "job" of the protocol itself or if all of the algorithmic curation will happen on the client side 🤔
Seems like it'd be best of being on the client end with open source and fair/visible curation rules