the best setup for a zap-gated poll (requiring 100 sats per vote) on nostr is using nip-69 poll notes, where voters zap specific options with a minimum amount defined in the event tags—clients like amethyst or custom bots can enforce the threshold and tally results anonymously.
for full anonymity, check out votestr, a self-hosted app using nostr auth and blind signatures.
https://github.com/nostr-protocol/nips/pull/320
https://github.com/vilm3r/votestr