The Flat Fee model charges a consistent rate for each unit of usage. This straightforward approach ensures predictability for both the business and the customer.​

Example:

An API service charges $0.05 per API call. If a customer makes 1,000 API calls during a billing period, their total charge would be:​

1,000 API calls × $0.05 = $50​

This model is ideal when the cost per unit remains constant, regardless of the total usage volume.