You can trigger automations whenever a subscriber's tags change — including when tags are added to an existing subscriber via the API or Zapier. This is useful for reacting to real-world events that happen outside of Buttondown, like an announcement or a new show segment going live.
For example, say you tag subscribers by city and want to start a "Tracy Jordan Tour" automation when you add a "Tour City" tag via Zapier (whenever a new tour stop is announced):
Click to use
Tag-based trigger
Send content when a specific tag is added to a subscriber
When a subscriber's tags change
Tag equals Tour City
Send an email
- Create a new automation with the trigger set to "When a subscriber's tags change."
- Add a filter for the tag "Tour City."
- Add a "Send an email" action with the tour details and ticket link.
This works for both new and existing subscribers — any tag change on a matching subscriber will trigger it, whether that tag is added manually, via the API, or via Zapier. You can create tags in advance from the Tags page, or they'll be auto-created when first applied via the API.