Account Statistics
The Account Statistics section provides an overview of your account usage. It includes information on the consumed bandwidth, the usage of any purchased Bond and your account type.

Bandwidth Usage
Bandwidth is consumed each time you download data using the Quantdle EA or the CSV Downloads for Platinum users. The bandwidth usage sections shows the amount of bandwidth you have used during the current billing cycle, which is set as a natural month.

Bond Usage
If you have purchased a Bond, the Bond usage section will show the amount of Bond bandwidth you have used.
Each Bond has a duration of 1 month, and its bandwidth will start to be computed when your main bandwidth is depleted. The Bond will expire after 1 month, independently of the bandwidth consumed.

You can read more about Bonds here.