The pay-as-you-go billing method requires you to pay for the resources that you use. If you want to create or delete NAT gateways based on your business requirements, you can purchase pay-as-you-go NAT gateways instead of subscription NAT gateways. This topic describes the billing rules of pay-as-you-go NAT gateways.

Billing

The following sections in this topic apply to public NAT gateways and Virtual Private Cloud (VPC) NAT gateways.

Overview

The pay-as-you-go billing method requires you to pay for the resources that you use.

Pay-as-you-go NAT gateways provide the following features:
  • Pay-as-you-go NAT gateways are billed based on the billing cycle. Bills are generated and fees are deducted from your account after each billing cycle.
  • You can delete pay-as-you-go NAT gateways at any time. After you delete a NAT gateway, the NAT gateway is no longer billed. For more information, see Delete a NAT gateway.
  • Pay-as-you-go NAT gateways provide high and guaranteed performance to withstand traffic spikes.
    Size Maximum number of SNAT connections Maximum number of new SNAT connections per second Throughput
    Default 2,000,000 100,000 5 Gbps
    The maximum quota that you can apply for by submitting a ticket. 10,000,000 1,000,000 100 Gbps

Pay-by-actual-usage

Total amount that you must pay for a pay-by-actual-usage NAT gateway = Instance fee + Capacity unit (CU) fee. You are charged and billed on an hourly basis. If you use a NAT gateway for less than 1 hour, the usage duration is rounded up to 1 hour.

The instance fee and CU fee are calculated by using the following formulas:
  • Instance fee = Instance unit price (USD/hour) × Usage duration (hours)

    Usage duration refers to the time period from when the NAT gateway is purchased to when it is released.

  • CU fee per hour = CU unit price (USD/CU) × Number of CUs

    Number of CUs consumed per hour by a NAT gateway = 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)

    New connections, concurrent connections, and data transfer are three metrics to CUs. The following table describes how the number of CUs per hour for each metric is calculated.
    Metric Unit CU coefficient Calculation of the number of CUs per hour
    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.
    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.
    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 following table describes the instance unit prices and CU unit prices for pay-by-actual-usage NAT gateways.
    Note If the prices in this table are different from those on the buy page, the prices on the buy page shall prevail.
    Region Instance unit price (USD/hour) CU unit price (USD/hour)
    China (Hangzhou) 0.034 0.034
    China (Shanghai)
    China (Chengdu)
    China (Shenzhen)
    China (Heyuan)
    China (Qingdao)
    China (Beijing)
    China (Zhangjiakou)
    China (Hohhot)
    China (Ulanqab)
    China (Hong Kong) 0.043 0.043
    UK (London)
    Japan (Tokyo)
    Singapore (Singapore)
    Australia (Sydney)
    Germany (Frankfurt)
    US (Silicon Valley)
    US (Virginia)
    Malaysia (Kuala Lumpur)
    Indonesia (Jakarta)
    India (Mumbai)
    UAE (Dubai)

    Example of calculating the CU fee

    You created three enhanced NAT gateways that use the pay-by-actual-usage metering method in the UK (London) region at 08:10:00 (UTC+8) on July 8, 2020. Then, you released the NAT gateways at 08:50:00 (UTC+8) on July 8, 2020. The following table describes the highest CPS value, the highest CONNS value, and the total amount of data transfer of the NAT gateways within the time period from 08:10 (UTC+8) to 08:50 (UTC+8).
    Metric Data collected from NAT Gateway 1 Data collected from NAT Gateway 2 Data collected from NAT Gateway 3
    Highest CPS value (count/second) 1100 32 0
    Highest CONNS value (count/minute) 20000 8 0
    Total amount of data transfer (GB/hour) 3.5 0.0056 0
    The numbers of CUs based on new connections, concurrent connections, and data transfer, and the CU fee are calculated by using the following formulas:
    The numbers of CUs are calculated by using the following formulas:
    Number of CUs based on CPS = Highest CPS value/CU coefficient
    Number of CUs based on CONNS = Highest CONNS value/CU coefficient
    Number of CUs based on data transfer = Total amount of data transfer/CU coefficient
    The CU fee is calculated by using the following formula:
    CU fee = 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 Data collected from NAT Gateway 1 Data collected from NAT Gateway 2 Data collected from 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

Pay-by-specification (applicable to only public NAT gateways)

Newly purchased pay-as-you-go NAT gateways only support the pay-by-actual-usage metering method.

Existing pay-as-you-go NAT gateways support the pay-by-specification metering method. These NAT gateways have three sizes: small, medium, and large. The unit price of a NAT gateway varies based on the size of the NAT gateway. The following table describes the unit price of each size.

Region Small (unit price) Medium (unit price) Large (unit price)
(USD/hour) (USD/day) (USD/hour) (USD/day) (USD/hour) (USD/day)
China (Qingdao) 0.076 1.829 0.146 3.505 0.287 6.888
China (Beijing)
China (Zhangjiakou)
China (Hohhot)
China (Ulanqab)
China (Hangzhou)
China (Shanghai)
China (Shenzhen)
China (Heyuan)
China (Chengdu)
US (Virginia) 0.102 2.448 0.190 4.572 0.375 8.991
China (Hong Kong)
Japan (Tokyo) 0.122 2.926 0.233 5.608 0.457 10.972
Singapore (Singapore) 0.114 2.743 0.222 5.334 0.433 10.363
Indonesia (Jakarta)
Australia (Sydney) 0.152 3.657 0.293 5.334 0.573 13.716
Malaysia (Kuala Lumpur) 0.109 2.606 0.211 5.068 0.410 9.845
India (Mumbai)
US (Silicon Valley) 0.108 2.591 0.210 5.029 0.401 9.601
UAE (Dubai) 0.229 5.486 0.439 10.515 0.860 20.64
Germany (Frankfurt) 0.137 3.292 0.262 6.309 0.515 12.344
UK (London) 0.132 3.168 0.253 6.072 0.494 11.856

Overdue payments

If a pay-as-you-go NAT gateway has an overdue payment, take note of the following rules:
  • The NAT gateway continues to serve your workloads within 15 days after the payment becomes overdue.
  • The NAT gateway is suspended on the 15th day if the overdue payment remains unsettled. After the NAT gateway is suspended, you cannot manage the NAT gateway.
  • If the overdue payment remains unsettled within 15 days after the NAT gateway is suspended, the NAT gateway is automatically deleted. An email 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 recovered.

Top up your account balance

Before you top up your account balance, take note of the following rules:
  • If you top up your account balance within 15 days after the payment becomes overdue, your service is not suspended.
  • If you top up your account balance within 30 days after the payment becomes overdue, the system automatically pays the outstanding amount. After the system pays the outstanding amount, the NAT gateway immediately starts to provide services.