Topic fees - ApsaraMQ for RocketMQ - Alibaba Cloud Documentation Center

If the number of topics on a subscription or pay-as-you-go ApsaraMQ for RocketMQ instance exceeds the specified free topic quota, you are charged for the excess topics. This topic describes the billing rules of topics.

Instance quotas

Standard Edition instances

Sub-category edition	Computing specification	Free topic quota	Maximum topic quota	Maximum group quota
Standalone Edition (no longer sold)	rmq.s1.micro	100	100	1,000
Cluster High-availability Edition	rmq.s2.2xlarge		300
	rmq.s2.4xlar		300
	rmq.s2.6xlarge		500

Professional Edition instances

Sub-category edition	Computing specification	Free topic quota	Maximum topic quota	Maximum group quota
Standalone Edition (no longer sold)	rmq.p1.micro	150	150	1,500
Cluster High-availability Edition	rmq.p2.4xlarge		500	2,000
	rmq.p2.6xlarge		500
	rmq.p2.10xlarge		1,000
	rmq.p2.20xlarge		1,000
	rmq.p2.50xlarge		2,000
	rmq.p2.100xlarge
	rmq.p2.150xlarge

Enterprise Platinum Edition instances

Sub-category edition	Computing specification	Free topic quota	Maximum topic quota	Maximum group quota
Cluster High-availability Edition	rmq.u2.10xlarge	200	3,000	4,000
	rmq.u2.20xlarge
	rmq.u2.40xlarge
	rmq.u2.100xlarge
	rmq.u2.150xlarge
	rmq.u2.200xlarge
	rmq.u2.400xlarge
	rmq.u2.600xlarge
	rmq.u2.1000xlarge

Billing rules

If the number of topics on an instance does not exceed the free topic quota, you are not charged topic fees. For information about the free quotas, see Instance quotas.
If the number of topics on an instance exceeds the free topic quota, you are charged for the excess topics.
For example, if you purchase a pay-as-you-go ApsaraMQ for RocketMQ Standard Edition (Cluster High-availability Edition) instance whose computing specification is rmq.s2.2xlarge, the free topic quota of the instance is 100. If the current number of topics on the instance is 120, you are charged for the excess 20 topics based on the following formula:
Number of paid topics = Current number of topics on the instance - Free topic quota of the instance

Billing formula

Topic fees are billed on an hourly basis. A usage period that is shorter than 1 hour is rounded up to 1 hour.

Topic fee per hour = Number of paid topics × Unit price of topics (USD per topic-hour)

Unit prices

The unit prices of topics vary based on the number of topics.

Billing tier	Paid topics	Region (all supported regions)
Billing tier	Paid topics	Unit price of topics on Standard Edition instances (USD per topic-hour)	Unit price of topics on Professional Edition and Enterprise Platinum Edition instances (USD per topic-hour)
First tier	(0,10]	0.006	0.012
Second tier	(10,50]	0.003	0.006
Third tier	(50,200]	0.002	0.003
Fourth tier	> 200	0.001	0.002

Billing example

You purchase a pay-as-you-go ApsaraMQ for RocketMQ Standard Edition (Cluster High-availability Edition) instance whose computing specification is rmq.s2.2xlarge. The following table describes the number of created topics on the instance and the topic fees that you are charged.

Time	Free topic quota	Number of created topics	Paid topics	Unit price	Total fees
First hour	100	Created: 130 Deleted: 10 Remaining: 120	130 - 100 = 30	Ten topics fall into the first tier, and the unit price is 0.006 USD per topic-hour. Twenty topics fall into the second tier, and the unit price is 0.003 USD per topic-hour.	10 × 0.006 + 20 × 0.003 = 0.12
Second hour	100	Created: 50	120 + 50 - 100 = 70	Ten topics fall into the first tier, and the unit price is 0.006 USD per topic-hour. Forty topics fall into the second tier, and the unit price is 0.003 USD per topic-hour. Twenty topics fall into the third tier, and the unit price is 0.002 USD per topic-hour.	10 × 0.006 + 40 × 0.003 + 20 × 0.002 = 0.22