Monitor the Credit Balance for Your Free Oracle Cloud Promotion
After you get free credits, you can monitor and manage your service usage and your credit balance.
In the Console, you can monitor billing, usage, and check your balance directly on the Console home page. See Viewing Billing Details for more information.
You can also monitor usage and costs from the Billing & Cost Management pages. See Billing and Cost Management Overview and Checking Your Expenses and Usage for more information.
Oracle sends you a notice when you get close to your credit limit.