This is something i feel that could be built by any coder familiar with nostr kinds.

If I were to do this Id build a service around it and probably base fees around both a time frame (e.g. base daily/monthly cost since its a monitoring service), and a fee per event handled.

Theres quite a bit of functionality needed to support such from the configuration and top up side

- auth with nostr and/or lnurl auth

- add/edit config (define rules for... relays to listen/check, pubkey for events to listen to references, phrases to look for in original post, phrases in reference posts, amount of sats to zap, comment to include in zap, start time, end time, limit number of posts to zap)

- check balance, add funds

and then extend with more rules and

- list campaigns (for multiple per acct)

- reports