Set your budget so that Google does not deduct more than you want. To see how Google Maps API is priced you can visit the calculator here. You are able to use up to $200 worth of map load for free monthly (approx. 28,500 map loads).
➜ Go to Google Cloud Platform ➜ Open Menu ➜ Click the Billing tab.
➜ Next, click the Budgets & alerts tab in the left menu.
➜ Click the Create budget button to get started creating a budget.
A pop-up will appear ➜ Enter the Budget name and Budget amount .
➜ For example $200 and remember to tick Include credit as a budget expense option. If you this option is untick, you cannot use your free credit.
➜ Finally, click “Save” to save all settings.