Monitor the Credit Balance for Your Free Oracle Cloud Promotion
After you get free credits, you can monitor and manage your service usage and credit balance.
You can monitor billing and usage and check your balance directly in the Cost analysis widget on the Console home page. When your free credits have been spent, you can upgrade your account to a paid account from the widget by selecting Upgrade account. Otherwise, your account becomes an Always Free account. For more information, see Viewing Billing Details.
You can also monitor usage and costs from the Billing & Cost Management pages. See Billing and Cost Management Overview for more information.
Oracle sends you a notice when you get close to your credit limit.