Billing

WAF instances are billed on a pay-per-use basis, which is postpaid.

Billing Item

**Table 1** Billing items
Billing Mode	Billing Item	Billing
Pay-Per-Use	(Mandatory) Edition specifications	Billed based on the specifications of purchased DSC edition (standard or professional). For details about specifications and functions of each edition, see Specifications of Different DSC Editions.
	(Optional) Database expansion package	Billed based on the number of purchased packages.
	(Optional) OBS expansion package	Billed based on the number of purchased packages.
	APIs (data masking and watermarking)	This feature is supported only by the professional edition and is charged based on the number of API calls.

Billing Mode

Pay-per-use billing: you can enable or disable a WAF instance anytime you want.

The billing starts when you enable DSC and ends when you disable it. You are charged based on the service edition, number of database and OBS expansion packages, and number of API requests.

Parent topic: Service Overview

Previous topic: Advantages

Next topic: Applicable Scenarios