Pay-as-you-go is the default billing mode for COS and is supported in all regions. According to the user's storage capacity, request, traffic, and other metering items, the user account is billed on a daily or monthly basis.

Billing Item

The cost of COS consists of three parts: storage fee, request fee, and traffic fee.

Billing Item	Billing Item Description	Billing Formula
COS Standard Storage Capacity	The billing is calculated based on the storage capacity, different storage types have different unit prices.	Storage capacity fee = storage capacity unit price x daily storage capacity.
COS Standard Storage Read Request	The request cost is calculated based on the number of requests, and the unit price of requests varies for different storage types.	Request fee = price per ten thousand requests x daily cumulative number of requests / 10000.
COS Standard Storage Write Request	The request cost is calculated based on the number of requests, and the unit price of requests varies for different storage types.	Request fee = price per ten thousand requests x daily cumulative number of requests / 10000.
COS Infrequent Storage Capacity	The billing is calculated based on the storage capacity, different storage types have different unit prices.	Storage capacity fee = storage capacity unit price x daily storage capacity.
COS Infrequent Storage Read Request	The request cost is calculated based on the number of requests, and the unit price of requests varies for different storage types.	Request fee = price per ten thousand requests x daily cumulative number of requests / 10000.
COS Infrequent Storage Write Request	The request cost is calculated based on the number of requests, and the unit price of requests varies for different storage types.	Request fee = price per ten thousand requests x daily cumulative number of requests / 10000.
COS Outbound External Network Traffic	Public network downstream traffic.	Traffic fee = price per GB x daily accumulated traffic.
COS Cross-region Replication Traffic	Cross-region Replication Traffic.	Traffic fee = price per GB x daily accumulated traffic.

Billing Cycle

The billing cycle and billing order of each billing item of COS are as follows:

Billing Item	Billing Cycle	Billing Cycle Description
COS Standard Storage Capacity	day	Settle the fees incurred on the previous day daily and generate the bill.
COS Standard Storage Read Request	day	Settle the fees incurred on the previous day daily and generate the bill.
COS Standard Storage Write Request	day	Settle the fees incurred on the previous day daily and generate the bill.
COS Infrequent Storage Capacity	day	Settle the fees incurred on the previous day daily and generate the bill.
COS Infrequent Storage Read Request	day	Settle the fees incurred on the previous day daily and generate the bill.
COS Infrequent Storage Write Request	day	Settle the fees incurred on the previous day daily and generate the bill.
COS Outbound External Network Traffic	day	Settle the fees incurred on the previous day daily and generate the bill.
COS Cross-region Replication Traffic	day	Settle the fees incurred on the previous day daily and generate the bill.