BitMEX supports different margin modes: Single Asset Margin and Multi Asset Margin. Each contract has a defined Settlement Currency which is used to pay/receive realise profit and loss, fees and funding. There are currently two Settlement Currencies : Bitcoin (XBT) and Tether (USDT).
Single Asset Margin
In Single Asset Margin mode, opening a position requires margin to be deposited that matches the Settlement Currency of the contract. Accounts are required to have a positive excess margin balance in each Settlement Currency at all times, or else they will be liquidated.
Multi Asset Margin
In Multi Asset Margin mode, margin balances in a selection of currencies count towards an account-level Multi Asset Margin margin balance. Each of these can be used to support margin requirements for contracts settled in either USDT or XBT, but haircuts are applied to the value of the margin currencies to reflect the additional risk BitMEX is undertaking by supporting margin requirements with different currencies.
The table below shows the current Margin currencies and their haircuts:
XBT Margin | ETH Margin | USDC Margin | USDT Margin | |
---|---|---|---|---|
XBT Settlement | 0% | 5% | 5% | 5% |
USDT Settlement | 5% | 5% | 2% | 0% |
Some users may be more familiar with the term Collateral Value Ratio which is usually defined as (1 - Haircut).
Because the Haircut varies by Margin Currency and Settlement Currency, we optimise your available Margin Currency balances against your margin requirements. If they do not meet your margin requirements you will be liquidated.