Overview

HSS provides two billing modes, yearly/monthly and pay-per-use billing, to meet requirements in different scenarios. To quickly learn about the price of HSS in different billing modes, visit HSS Pricing Details.

Yearly/Monthly is a prepaid billing. You pay in advance for a subscription term, and in exchange, you get a discounted rate. The longer the subscription term, the bigger the discount.
Pay-per-use: You can start using HSS first and then pay as you go. With the pay-per-use billing mode, you can easily adapt to resource requirement changes, reducing the risk of over-provisioning resources or lacking capacity. In this mode, there are no upfront commitments required.

Table 1 describes the differences between the billing modes.

**Table 1** Billing modes
Billing Mode	Yearly/Monthly	Pay-per-Use
Payment	Prepaid Billed by the subscription term you purchase	Postpaid Billed by usage
Billing Items	Protection quotas: basic, professional, premium, Web Tamper Protection (WTP), and container editions	Protection quotas: professional, premium, WTP, and container editions Value-added services: pay-per-use container image scans
Billing Period	Billed for the required duration specified in your order.	Protection quotas: Billed by the second and settled by the hour. Value-added services: billed per use.
Billing for Stopped Protection	Billed for the required duration specified in your order. Disabling protection for servers and containers does not affect yearly/monthly billing.	Protection quotas: You will not be billed for a quota after it is disabled. Value-added services: Pay-per-use billing. Enabling or disabling HSS protection does not affect it.
Changing the Billing Mode	Can be changed to pay-per-use. For details, see Yearly/Monthly to Pay-per-use.	The billing mode can be changed to yearly/monthly for protection quotas. For details, see Pay-per-Use to Yearly/Monthly.
Upgrading Quotas	The basic and professional editions can be upgraded to higher editions.	Specifications cannot be upgraded.
Application Scenarios	A cost-effective option for scenarios where the resource usage duration is predictable. Recommended for resources expected to be in long-term use.	Recommended when the demands for server or container protection are likely to fluctuate and you want more flexibility.