I am using WebSocket hibernation so the connection will cost nothing if no events are being sent after some time, 9 seconds I think. I think cost is completely negligible. I run a similar service for the Framer MCP and it costs basically nothing even with thousands of users using it every week.
The big advantage of this architecture is that it that it's very lightweight and starts in less than 200ms. Much faster than the built in Cloudflare tunnel, and no login required
