Generate a unique API key. POST to it with variables. A template email fires. No auth headers. No SDKs. Just one URL.

POST /api/trigger/YOUR_KEY with {to, variables}. That is it. The key is the auth.
Set a default_to so you can fire the trigger without even passing a recipient.
Toggle triggers on and off without deleting them. Disabled triggers return 403.
Every trigger shows the full URL with a copy button and an example curl command.