Billable items in COS include storage usage, requests, data retrievals, traffic, and administrative features. The following describes each billable item in detail. After learning about them and the Product Pricing, you will be able to estimate fees on your own.

Note：

COS offers 3 object storage classes for different access frequencies: STANDARD, STANDARD_IA, and ARCHIVE. For more information, see Storage Classes.

Storage Usage Fees

Billing restrictions

1. STANDARD_IA storage class: if the storage duration is less than 30 days, it will be calculated as 30 days. If a single stored file is less than 64 KB, it will be calculated as 64 KB; otherwise, files are calculated based on their actual size.
2. ARCHIVE storage class: this storage class is available in Public Cloud regions only. If the storage duration is less than 90 days, it will be calculated as 90 days. If a single stored file is less than 64 KB, it will be calculated as 64 KB; otherwise, files are calculated based on their actual size.
3. If you upload an object successfully to STANDARD_IA or ARCHIVE storage class with versioning not enabled, COS will delete any existing objects of the same name. In this case, storage fees will still be incurred for the deleted objects for a minimal storage duration.

Request Fees

Request fees include the fees incurred by user requests and backend requests generated by feature configuration.

• User requests: you can perform upload, download, query, delete and other operations via APIs, SDKs or the console by sending requests to Tencent COS.
• Backend requests: these include requests to transition objects, delete expired STANDARD copies restored from ARCHIVE, read/write data for cross-region replication, and deliver inventory reports.

Billing restrictions

1. Both successful and failed requests are billable.
2. 10,000 requests serve as the smallest counting unit for request fees; therefore, if the number of monthly accumulated requests is below 10,000 it will be calculated as 10,000 requests, no matter whether a request succeeds or fails.
3. When archived data is read, the data is first restored to the STANDARD storage class and then read there; therefore, the number of requests is counted in the STANDARD storage class.

Data Retrieval Fees

Billing restrictions

STANDARD_IA and ARCHIVE are designed to store cold data. To download object data from these two storage classes, you need to retrieve it first, thereby incurring both retrieval fees and download traffic fees.

Traffic Fees

Traffic fees are calculated based on the accumulated traffic generated by storage data reads.

Billing restrictions

1. When archived data is read, the data is first restored to the STANDARD storage class and then read there; therefore, the traffic is counted in the STANDARD storage class.
2. CDN origin-pull traffic refers to the traffic generated by data transfer from COS to a Tencent Cloud CDN edge server. If traffic is forwarded from a third-party origin server to COS, public network downstream traffic will be generated.

Note：

• Tencent Cloud products within the same region access each other over the private network by default and no traffic fees will be incurred. For more information on how to identify private network access, please see COS Access via Private Network and Public Network.
• Public network downstream traffic consists of the traffic generated by downloading objects through object URLs and browsing objects through static website access nodes.
• CDN origin-pull traffic refers to traffic generated by browsing or downloading COS data from the client through CDN acceleration endpoints after CDN acceleration is enabled.
• Cross-region replication traffic is generated when you replicate data from a bucket in one region to a bucket in another region using APIs or the cross-region replication feature.

Traffic trends

The figure below shows the traffic fees incurred by data transmitted from COS to an end user with CDN acceleration enabled and disabled, respectively.

Administrative Feature Fees

Administrative feature fees are calculated based on the use of enabled administrative features, such as inventory and COS select.