Overview

Pay-per-use and yearly/monthly billing modes are supported.

Yearly/Monthly is a prepaid mode. You need to pay first, and will be billed for your subscription period. The longer the period, the larger the discount. This mode is suitable for long-term, stable services.
Pay-per-use is a postpaid mode. You are billed for the function modules and nodes you used and the usage duration. The fees are calculated in hours 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 scenarios with traffic bursts, such as e-commerce.

Table 1 compares the two billing modes.

**Table 1** Billing modes
Billing Mode	Yearly/Monthly	Pay-per-use
Payment	Prepaid Billed by the required duration specified in your order	Postpaid Billed by the function modules, nodes, and usage duration
Billing Cycle	Billed by the required duration specified in your order	Calculated in hours and settled by hour
Billing Mode Change	Not supported	Not supported
Specifications Change	Not supported	Not supported
Billed Item	MAS instances	Numbers of the function modules and nodes
Application Scenario	Recommended for long-term use. Suitable and price-friendly for scenarios where the resource usage duration can be estimated.	Recommended if you want more flexibility. Suitable for scenarios where resource demands fluctuate.