All margin is posted in 'USD' in your wallet. USD can be funded by depositing either USDC or TUSD.
Each subaccount has one central collateral wallet and uses portfolio margining for the account. Each subaccount has separate margin and collateral from other subaccounts.
An account can only increase its position as long as its Margin Fraction is above its Initial Margin Fraction. For small positions, this means that the Margin Fraction must be at least 5%, meaning that accounts can only initialize positions to a maximum of 20x leverage. As your position size increases, so does your Initial Margin Fraction.
If you Margin Fraction falls below your Maintenance Margin Fraction, your account will begin to get liquidated.
FTX Crypto Derivatives Exchange: https://ftexchange.com
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