When the Free Quota Runs Out, Will the System Charge You Directly or Return an Error? Understanding the Mechanisms That Avoid Unexpected Bills
If you go over the limit, could you suddenly get a huge bill? A deep dive into the safety circuit breaker for accounts without a card: it only returns 429 and never charges you on its own, removing all of beginners' financial worries.
1. Absolute Safety Without a Linked Card
Many beginner developers are hesitant to call it without worry, always fearing that if they accidentally write an infinite loop, they will get a huge bill from Google next month.
Rest assured: unless you proactively link a valid foreign-currency credit card in GCP and enable a paid plan, your account will always remain in a purely free sandbox.
2. The Safety Umbrella of 429 Errors
Once your number of calls exceeds 15 RPM or the daily limit of 1,500, Google's servers will simply safely return an HTTP 429 Too Many Requests status code and refuse the request. The system has absolutely no way to deduct any of your funds on its own.