Tunnels bill 1 credit ($0.01) per connected hour. That is cheap until you forget one. The app is built partly to prevent that mistake. These guardrails run on your Mac, which is why they live in the app and not in a browser tab. Find them under Settings → Spend guardrails.
| Guardrail | Default | What it does |
|---|---|---|
| Stop tunnels on sleep | On | Stops tunnels when your Mac goes to sleep. A sleeping Mac can't serve a tunnel, so it shouldn't keep billing. |
| Idle reminders | On, after 3 hours | Sends a notification when a running tunnel has had no traffic for the threshold. Choose 1 to 24 hours. |
| Monthly spend warning | Off | Set a dollar limit. If the projected monthly cost of what is running goes over it, you get a notification, once per month. |
| Spend in the menu bar | On | Shows the projected monthly spend next to the menu bar icon. |
| Cost-labeled auto-stop | 8 hours | Every auto-stop option in the tunnel sheet shows its cost, and turning auto-stop off shows a warning. |
Webhook endpoints are exempt on purpose. They are meant to be always on, each one is capped at $3 per rolling 30 days, and stopping one would mean missed events. The app never auto-stops a webhook.