# Billing Description (All users are free of charge during the closed beta period)

## Billing Mode
API Gateway usage fee = 【Invocation times】+ 【Traffic fee】

* Invocation fee: The API Gateway uses a `daily statistics` `post-paid` `pay-as-you-go` model for charging, and the unit cost is stair-step model. `Post-paid bill` can be paid with cash, and `credit line` can be also used for payment. If there is no overdue bill in the account, `gift money` can be used for payment. The API Gateway counts the valid access (HTTP Status [200 - 399)) requests per day (UTC +8) based on the API call volume.
* Traffic fee: `Inbound charges` are free, and `outbound charges` are billed according to the actual response volume.


## Invocation Charges
The API Gateway calculates the number of effective requests within each day's statistical cycle and generates a bill based on the actual request volume. The charge for request times adopts a stepwise model. The first 1 million times of each natural month are free.

|  Request Volume  | Billing Unit Price  |
| --------| -------- |
| Below 1 million times in natural month | Free |
| From 1 million to 10 million times | 0.05 Yuan / 10,000 times |
| From 10 million to 100 million times | 0.03 Yuan / 10,000 times |
| More than 100 million times | 0.02 Yuan / 10,000 times |