We haven't had many projects exceed their daily free tier so far, and we've been backing all App Engine Flexible deployments for a while. If you do exceed your

We haven't had many projects exceed their daily free tier so far, and we've been backing all App Engine Flexible deployments for a while. If you do exceed your daily free tier, you're only billed $0.0034/minute, on a per-second basis, so we expect the cost of using this product to be very low. (disclaimer: I work on this product)