BBX rates your contract fee schedule tier based on the amount of your contract transaction. As shown in the figure below：
|Tier||olume（Last month's trading volume, unit USDT）||Maker fee||Taker fee|
Note: The contract fee will be charged first and refunded later. The fee will be refunded if the contract fee is settled at 20:00 UTC per day.
The fee level is calculated based on the total transaction volume in all contract currencies in the last month in USDT. This level determines the amount of fee refunded.