Can I set a hard limit to Google Cloud Platform spend? if yes, how?

I'd like to make sure I don't spend too much money in GCP (Google Cloud Platform) usage, but I'm not sure of the way to do so, if such a way exist.

So I tried creating budgets in GCP, but I doubt these are hard cap, since the documentation and this question (though asking about google developer console, therefore my question isn't, I think, a duplicate) seem to suggest Google budgets are simply sending notification, but don't put hard cap on your GCP usage.

Thank you for your help.

Solution

It is possible to cap costs and stop usage for a Google Cloud project. You need to

setup up a budget to monitor project costs,
enable budget notifications
and then configure a Cloud Function to call the Cloud Billing API that disables billing for the project as described in GCP documentation.