You are charged for using Internet NAT gateways. This topic describes the billing method and billable items of Internet NAT gateways.

Overview

Internet NAT gateways support the pay-as-you-go billing method.
The total fee of a pay-as-you-go Internet NAT gateway includes an instance fee and a capacity unit (CU) fee. The total fee is calculated based on the following formula:
Total fee = Instance fee + CU fee
Take note of the following information about pay-as-you-go Internet NAT gateways:
  • You are charged for the amount of resources that you use in each billing cycle. Bills are generated and fees are deducted from your account balance on a regular basis. The billing cycle of Internet NAT gateways is 1 hour. Bills are generated and fees are deducted from your account balance on an hourly basis.
  • After you delete an Internet NAT gateway, the billing immediately stops. For more information about how to delete an Internet NAT gateway, see Delete an Internet NAT gateway.
  • Internet NAT gateways can handle traffic spikes. The following table describes the performance metrics of Internet NAT gateways.
    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

Pay-as-you-go

The pay-as-you-go billing method supports the pay-by-CU metering method. The billing cycle of Internet NAT gateways is 1 hour. Bills are generated and fees are deducted from your account balance on an hourly basis. If you use an Internet NAT gateway for less than 1 hour, the usage duration is rounded up to 1 hour.
Total fee of a pay-by-CU Internet NAT gateway = Instance fee + CU fee

Instance fee

Instance fee = Unit price of an Internet NAT gateway(USD/hour) × Usage duration (hours)

The usage duration is the period from the time when the Internet NAT gateway is purchased to the time when the Internet NAT gateway is deleted.

The following table lists the unit prices of Internet NAT gateways.
Note The prices in the following table are provided only for reference. The actual prices on the buy page shall prevail.
Region Unit price(USD/hour)
China (Hangzhou), China (Shanghai), China (Qingdao), China (Beijing), China (Zhangjiakou), China (Hohhot), China (Ulanqab), China (Shenzhen), China (Heyuan), China (Guangzhou), and China (Chengdu) 0.034
China (Hong Kong), Japan (Tokyo), South Korea (Seoul), Singapore (Singapore), Australia (Sydney), Malaysia (Kuala Lumpur), Indonesia (Jakarta), Philippines (Manila), Thailand (Bangkok), India (Mumbai), Germany (Frankfurt), UK (London), US (Silicon Valley), US (Virginia), and UAE (Dubai) 0.043

CU fee

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)

CUs measure the dimensions on which an Internet NAT gateway processes traffic. The following table lists the dimensions.

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:
Number of CUs based on CPS = Highest CPS value/CU coefficient
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:
Number of CUs based on CONNS = Highest CONNS value/CU coefficient
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.
The number of CUs based on data transfer is calculated by using the following formula:
Number of CUs based on data transfer = Total amount of data transfer/CU coefficient
The following table lists the unit prices of CUs for Internet NAT gateways.
Note The prices in the following table are provided only for reference. The actual prices on the buy page shall prevail.
Region Unit price of CU(USD/ENI/hour)
China (Hangzhou), China (Shanghai), China (Qingdao), China (Beijing), China (Zhangjiakou), China (Hohhot), China (Ulanqab), China (Shenzhen), China (Heyuan), China (Guangzhou), and China (Chengdu) 0.034
China (Hong Kong), Japan (Tokyo), South Korea (Seoul), Singapore (Singapore), Australia (Sydney), Malaysia (Kuala Lumpur), Indonesia (Jakarta), Philippines (Manila), Thailand (Bangkok), India (Mumbai), Germany (Frankfurt), UK (London), US (Silicon Valley), US (Virginia), and UAE (Dubai) 0.043

Billing example for CU fees

The CU fee is calculated by using the following formula:
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
You created three VPC NAT gateways in the Germany (Frankfurt) region at 08:10:00 (UTC+8) on November 8, 2021. Then, you released them at 08:50:00 (UTC+8) on November 8, 2021. The following table describes the highest CPS value, the highest CONNS value, and the total amount of data transfer of the three VPC NAT gateways from 08:10:00 (UTC+8) to 08:50:00 (UTC+8).
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
The following table describes the numbers of CUs based on new connections, concurrent connections, and data transfer, and the CU fees of the NAT gateways.
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 top-ups for pay-as-you-go Internet NAT gateways

Item Description
Overdue payment
  • An Internet NAT gateway can still serve your workloads within 15 days after a payment becomes overdue.
  • If the payment is not completed 15 days after it becomes overdue, the Internet NAT gateway is suspended. You cannot manage a suspended Internet NAT gateway.
  • If the payment is not completed 15 days after the Internet NAT gateway is suspended, the Internet NAT gateway is automatically deleted. An email notification is sent to you one day before the Internet NAT gateway is deleted. After the Internet NAT gateway is deleted, the configurations and data of the Internet NAT gateway are deleted and cannot be recovered.
Top-up
  • If you top up your account balance within 15 days after a payment becomes overdue, your service is not interrupted.
  • If you top up your account balance within 30 days after a payment becomes overdue, the system automatically pays the amount due. After the overdue payment is settled, the Internet NAT gateway immediately resumes services.

Billing of related services

After you create an Internet NAT gateway, you must associate an EIP with the Internet NAT gateway. This enables the Internet NAT gateway to access the Internet. You are charged for the EIPs that are associated with Internet NAT gateways. For more information, see Subscription and Pay-as-you-go.