Oracle uses a pay-as-you-go or subscription-based billing system for its Oracle Integration Cloud (OIC) service. This price can vary depending on a variety of factors such as:

1. The specific plan: Oracle has a variety of plans, each offering a different set of features. Some plans may also include other Oracle services, which can also affect the cost.

2. Usage: Some parts of the billing may be based on usage. For instance, you might pay based on the number of users, the amount of data processed, or the number of connections made.

3. Region: The prices for Oracle’s services can vary based on the region or country where the service is being used.