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What is the Terms and Formulas of UM?
What is the Terms and Formulas of UM?
Updated over a week ago

In unified margin (UM) mode, you can trade spot, margin, 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.

Currency Dimension

Name

Explanation

Formula

Equity

Equity in a currency in the account

Equity = cash balance + unsettled PNL - accrued interest + options value

Margin balance

The balance of a currency available as margin

Margin balance = cash balance +unsettled PNL - accrued interest

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)

Frozen

Amount frozen in a currency due to spot open orders

Frozen = Σ (spot order amount in short leg for each currency)

Initial margin

The minimum margin amount required for users to open a position. The initial margin is inversely proportional to the leverage used by the user

The calculation of initial margin in a currency is the same as the classic mode.


Regular: please see here for details

Portfolio margin: please see here for details

Maintenance margin

The minimum margin amount required by the user to maintain the position. Maintenance margin is calculated based on the tier corresponding to the notional value of the user's position

The calculation of maintenance margin in a currency is the same as the classic mode.


Regular: please see here for details

Portfolio margin: please see here for details

Unsettled PNL

The sum of profit and loss on all futures and perpetual positions settled in a particular currency in the current session.

Unsettled PNL= realised profit & loss (perpetual and futures) + unrealised profit & loss (perpetual and futures)

Liability

The liability amount in a currency, interest will be calculated once an hour.

Liability = |min (0, equity)|

Real-Time Settlement

For all perpetual contracts and options, BIT adopts a real-time settlement system. The realized profits and losses generated from user trading of contracts or options will be immediately transferred to the account balance. On the other hand, the unrealized profits and losses will not be settled daily; users need to close positions to realize and settle profits and losses.
This means that the user's realized profit part will be immediately available and can be withdrawn at any time without waiting for settlement at a fixed time every day. Such an instant settlement mechanism effectively improves the efficiency of fund use and allows users to manage their funds more flexibly.

Please read here

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) |

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

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

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

Account Dimension

Name

Explanation

Formula

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)]

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)]

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)

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

Total liability

The sum of each currency's liability amount converted to USD.

Total liability = Σ(currency liability * USD Index)

Total unsettled PNL

The sum of each currency's unsettled profit and loss converted to USD.

Total unsettled PNL = currency unsettled PNL * USD Index

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)

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)

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

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

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