Overview

ServiceComb engines have one billing mode: pay-per-use.

Pay-per-use is postpaid. You use engines first, and then pay as billed for your usage duration. The fees are calculated by second and settled by hour. This allows you to adjust resource usage easily. You neither need to prepare for resources in advance, nor end up with excessive or insufficient preset resources. This mode is suitable for traffic bursts.

**Table 1** Billing modes
Billing Mode	Pay-per-use
Payment Mode	Postpaid Billed by usage duration
Billing Cycle	Billed by second and settled by hour
Billing Item	ServiceComb engine instance specifications
Billing for Frozen Engines	You will not be billed for frozen engines.
Billing Mode Change	Not supported.
Specifications Change	Supported
Recommended Scenario	When resource demands fluctuate. You can enable and delete resources as needed.