Are there any fixed-price platforms to host your web app?

Or at least something with a clear billing protection. Every single one I’ve seen so far uses pay-as-you-go model, which kinda scares me after seeing so many billing abuse stories. Yes, individuals rarely pay 100k bills and providers just wave them, but the whole stress of the situation must still be awful.

And I really don’t need much: Just a Node/Fastify service that has one API endpoint and one that serves static HTML.

I’ve already tried Firebase, Render.com, fly.io, but every single one of them take compute costs in addition to the monthly fee. Tried going back to Heroku after 10 years, but their pricing model is very confusing now.