Zap Reducer NIP: https://github.com/nostr-protocol/nips/pull/1877/files
It's like NIP-45 Counts but allows you to reduce filtered zap amounts to based on some function like:
- sum
- avg
- min
- max
- count
relays that implement this nip will allow the client to just ask for the sum of all zaps rather than streaming all of the zaps and summing on the client.
#grownostr