In unified margin (UM) mode, you can trade spot, margin, futures, perpetual, and options at the same time by transferring assets into your unified account. Besides, your assets in different currencies (e.g. BTC, ETH and USDT, etc.) are calculated in USD value and used as margin for placing orders and holding positions for all trading products. The unified account system is divided into a currency dimension and an account dimension, please refer to the following explanation of terms and formulas for more details.
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Level |
Name |
Explanation |
Formula |
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Currency |
Equity |
Equity in a currency in the account |
Equity = cash balance + unsettled PNL - accrued interest + options value |
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Margin balance |
The balance of a currency available as margin |
Margin balance = cash balance +unsettled amount - accrued interest |
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Available balance |
The amount available for selling, position opening and options trading in a currency |
Regular: available balance = max (0, margin balance - initial margin - frozen) Portfolio margin: available balance = max (0, equity - initial margin - frozen) |
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Frozen |
Amount frozen in a currency due to spot open orders |
Frozen = Σ (spot order amount in short leg for each currency) |
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Initial margin |
Initial margin for all derivatives settled in a currency |
The calculation of initial margin in a currency is the same as the classic mode.
Portfolio margin: please see here for details |
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Maintenance margin |
Maintenance margin for all derivatives settled in a currency |
The calculation of maintenance margin in a currency is the same as the classic mode.
Portfolio margin: please see here for details |
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Unsettled PNL |
The sum of profit and loss on all futures and perpetual positions settled in a particular currency in the current session. |
Unsettled amount= realised profit & loss (perpetual and futures) + unrealised profit & loss (perpetual and futures) |
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Liability |
The liability amount in a currency, interest will be calculated once an hour. |
Liability = |min (0, equity)| |
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Accrued interest |
BIT calculates the hourly accrued interest based on the borrow rate and the user’s liabilities every hour on the hour. Accrued interest is the accumulated undeducted interest from the last settlement time(8:00 UTC) to the latest interest calculation time. |
Accrued interest =Σ(hourly borrow rate * liability) (The accrued interest in the current session) |
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Potential liability |
When the equity of a currency is less than the sum of the current initial margin and frozen amount, the difference amount is potential liability, which will take up a certain amount of total USD initial margin. |
Potential liability = |min (0,equity - initial margin - frozen) | |
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Short spot initial margin rate |
The initial margin rate that potential liabilities take up with in the account dimension |
Please read here for short spot initial margin rate |
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Short spot maintenance margin rate |
The maintenance margin rate that potential liabilities take up with in the account dimension |
Please read here for short spot maintenance margin rate |
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Delta |
The delta of a position in a currency represents the change of position value due to the change in the underlying asset’s price. In other words, delta is how many dollars a position value moves when the price of the underlying asset moves by $1. |
Currency delta = sum of positions delta in the currency (derivatives positions) - option value in the currency
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Level |
Name |
Explanation |
Formula |
Account |
Total collateral |
The USD value of total collateral which is the sum of all collateral currencies calculated with haircut ratio in the unified account. |
Total collateral =Σ [max (0,equity) * (100% - haircut ratio) * currency index -Σ(liability * currency index)] |
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Total margin balance |
Sum of USD value of margin balance in all currencies calculated with haircut ratio in the unified account. |
Total margin balance = Σ [max (0, margin balance) * currency index * (100% - haircut ratio) + min (0, margin balance) *currency index)] |
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Total available balance |
Available margin balance for opening margin, futures, perpetual and options positions in the unified account. |
Regular: total available balance = max (0, total margin balance - total initial margin - total frozen) Portfolio margin: total available balance = max (0, USD total collateral - USD total initial margin - total frozen) |
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Spot order haircut loss |
When a spot order is placed or filled, if the long currency haircut ratio is greater than the short currency haircut ratio, there will be a decrease in the total collateral, and the decreased amount is spot order haircut loss. |
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Total frozen |
Sum of USD value of haircut losses in all spot trading pairs in the unified account. |
Total frozen = sum of all haircut losses |
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Total liability |
The sum of each currency's liability amount converted to USD. |
Total liability = Σ(currency liability * USD Index) |
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Total unsettled PNL |
The sum of each currency's unsettled profit and loss converted to USD. |
Total unsettled PNL = currency unsettled PNL * USD Index |
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Total initial margin |
USD value of initial margin required by all positions, pending orders and potential liabilities in the unified account. |
Total initial margin= Σ(initial margin * currency index) + Σ(potential liability * short spot IM rate * currency index) |
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Total maintenance margin |
USD value of maintenance margin required by all positions, pending orders and potential liabilities in the unified account. |
Total maintenance margin= Σ (maintenance margin * currency index) + Σ(potential liability * short spot MM rate * currency index) |
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Total IM% (total initial margin rate) |
Account risk indicator |
Regular: total IM% = [total initial margin + total frozen] / total margin balance Portfolio margin: total IM% = [total initial margin + total frozen] / total collateral |
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Total MM% (total maintenance margin rate) |
Account risk indicator |
Regular: Total MM%= total maintenance margin/ total margin balance Portfolio margin: Total MM%= total maintenance margin/ total collateral |