Zap providers could issue badges based on total zapped amount, individual zap amount, number of different pubkeys zapped over a certain amount, etc.
Discussion
Its public data, your nostr client should do this not the zap provider IMO.
Yes client would indeed be better IMO.
Imagine the wars to get someone's "top zapper" badge.
It’s a shit badge anyway because we can engage in wash zapping where we zap each other back and forth to game the metric. Nvm.
How about badges based on total PoW?
Notes can have PoW, and even small amounts of it can accumulate over time.
Can replace captchas.
Proof of zapped. I like it
Who are these zap providers?
We don't want or need 'zap providers'
NIP Zapper badges 
We need?