You are charged for using Virtual Private Cloud (VPC) NAT gateways. This topic describes the billing method and billable items of VPC NAT gateways.
Billing overview
VPC NAT gateways support the payasyougo billing method.
VPC NAT gateway fee = Instance fee + CU fee
 You are billed based on the billing cycle. Bills are generated and fees are deducted on a regular basis. The billing cycle of VPC NAT gateways is 1 hour. Bills are generated and fees are deducted on an hourly basis.
 After you delete a VPC NAT gateway, the billing is immediately stopped. For more information about how to delete a VPC NAT gateway, see Delete a VPC NAT gateway.
 VPC NAT gateways can handle traffic spikes. The following table describes the metrics
of performance.
Specification Number of maximum connections Maximum number of new connections Throughput Default 2,000,000 100,000 5 Gbps Maximum quota that you can apply for by submitting a ticket 10,000,000 1,000,000 100 Gbps
Instance fee
You are charged an instance fee for a VPC NAT gateway on an hourly basis. If the usage duration of a VPC NAT gateway is less than 1 hour, it is rounded up to 1 hour.
Instance fee = Unit price(USD/hour) × Usage duration (hours)
The usage duration is the period from the time when a VPC NAT gateway is created to the time when it is deleted.
Region  Unit price(USD/hour) 

China (Hangzhou), China (Shanghai), China (Chengdu), China (Shenzhen), China (Heyuan), China (Guangzhou), China (Qingdao), China (Beijing), China (Zhangjiakou), China (Hohhot), and China (Ulanqab)  0.034 
China (Hong Kong), UK (London), Japan (Tokyo), Singapore (Singapore), Australia (Sydney), Germany (Frankfurt), US (Silicon Valley), US (Virginia), Malaysia (Kuala Lumpur), Indonesia (Jakarta), India (Mumbai), UAE (Dubai), and Philippines (Manila)  0.043 
CU fees
You are charged a CU fee for a VPC NAT gateway on an hourly basis. If the usage duration of a VPC NAT gateway is less than 1 hour, it is rounded up to 1 hour.
CU fee per hour = CU unit price (USD/CU) × Number of CUs consumed per hour
Number of CUs consumed per hour = Max{Number of CUs based on new connections per hour,
Number of CUs based on concurrent connections per hour, Number of CUs based on data
transfer per hour}Metric  Unit  CU coefficient  How the number of CUs per hour is calculated 

Connections per second (CPS)  Second  1,000  The system collects all CPS values within a billing cycle and then divides the highest
CPS value by the CU coefficient to calculate the number of CUs. The number of CUs
based on CPS is calculated by using the following formula:

Concurrent connections (CONNS)  Minute  10,000  The system collects all CONNS values within a billing cycle and then divides the highest
CONNS value by the CU coefficient to calculate the number of CUs. The number of CUs
based on CONNS is calculated by using the following formula:

Data transfer (bytes)  Hour  1 GB  The system collects the total amount of data transfer including the inbound and outbound
traffic within a billing cycle. Then, the system divides the total amount by the CU
coefficient to calculate the number of CUs.
Note The amount of outbound and inbound network traffic collected by the system equals
the amount of network traffic to be processed by a NAT gateway.

Region  Unit price of CU(USD/ENI/hour) 

China (Hangzhou), China (Shanghai), China (Chengdu), China (Shenzhen), China (Heyuan), China (Guangzhou), China (Qingdao), China (Beijing), China (Zhangjiakou), China (Hohhot), and China (Ulanqab)  0.034 
China (Hong Kong), UK (London), Japan (Tokyo), Singapore (Singapore), Australia (Sydney), Germany (Frankfurt), US (Silicon Valley), US (Virginia), Malaysia (Kuala Lumpur), Indonesia (Jakarta), India (Mumbai), UAE (Dubai), and Philippines (Manila)  0.043 
Example of CU billing
Metric  NAT Gateway 1  NAT Gateway 2  NAT Gateway 3 

Highest CPS value (connections/second)  1100  32  0 
Highest CONNS value (connections/minute)  20000  8  0 
Total amount of data transfer (GB/hour)  3.5  0.0056  0 
CU fee per NAT gateway per hour = Max{Number of CUs based on new connections per hour, Number of CUs based on concurrent connections per hour, Number of CUs based on the amount of data transferred per hour} × CU unit price
Number of CUs  NAT Gateway 1  NAT Gateway 2  NAT Gateway 3 

Number of CUs based on CPS  1100÷1000=1.1  32÷1000=0.032  0 
Number of CUs based on CONNS  20000÷10000=2  8÷10000=0.0008  0 
Number of CUs based on data transfer  3.5÷1=3.5  0.0056÷1=0.0056  0 
CU fee (USD)  3.5×0.043=0.1505  0.032×0.043=0.001376  0 
Overdue payments and topups
 Take note of the following information about overdue payments:
 A VPC NAT gateway continues to serve your workloads within 15 days after the payment becomes overdue.
 If the outstanding amount is not paid 15 days after the payment becomes overdue, the VPC NAT gateway is suspended. You cannot manage a suspended NAT gateway.
 If the outstanding amount is not paid 15 days after the NAT gateway is suspended, the NAT gateway is automatically deleted. An email notification is sent to you one day before the NAT gateway is deleted. After the NAT gateway is deleted, the configurations and data of the NAT gateway are deleted and cannot be restored.
 Take note of the following information about topups:
 If you top up your account balance within 15 days after the payment becomes overdue, your service is not interrupted.
 If you top up your account balance within 30 days after the payment becomes overdue, the system automatically pays the outstanding amount. After the overdue payment is completed, the VPC NAT gateway immediately resumes services.