Unified-Account Margin Modes: Single-Currency, Multi-Currency, and Portfolio Margin
You may have accepted the default when an exchange asked you to choose an account mode. This is not a display preference: it determines how widely margin is shared. The same balances and positions can have different available margin and liquidation exposure depending on the mode. Names vary by exchange, but the structure has three levels.
Account Mode Means the Scope of Shared Margin
In futures, margin is money locked to support a position. Account mode determines which pockets that money can come from. Combining pockets supports more positions with the same funds, but also expands what can be pulled into a loss.
① Single-currency margin
Separate wallets for each coin. USDT positions use only USDT.
→ Narrower damage scope; lower capital efficiency.
② Multi-currency margin
Pool held assets as collateral, including BTC and ETH.
→ Medium capital efficiency; whole-account exposure.
③ Portfolio margin
Offset position risks to reduce the required margin itself.
→ High efficiency; potentially most dangerous without understanding the structure.
Moving from ① to ② differs from moving from ② to ③. The second level combines collateral; the third changes how required margin is calculated. Without that distinction, portfolio-mode figures are hard to explain.
① Single-Currency Margin: Separate Currency Wallets
This is the simplest structure. USDT-margined futures use USDT; coin-margined futures use the relevant coin. See USDT versus coin margin for that distinction.
Margin available for USDT futures: $500.
The 0.01 BTC is not counted as collateral.
→ Once the 500 USDT is committed, no additional entry is possible.
→ To use the BTC, sell it for USDT first.
This inconvenience has a clear benefit: trouble in the USDT wallet does not touch the BTC spot holding. A position's damage ends within its currency wallet. It extends the containment idea of cross versus isolated margin to the account level.
② Multi-Currency Margin: All Eligible Holdings Become Collateral
This is where “unified account” commonly begins. Assets are valued and pooled as margin. Since coin prices move, exchanges apply collateral recognition ratios, or haircuts, crediting less than face value.
500 USDT × 100% = $500
BTC value $650 × 90% = $585, assuming a 10% haircut.
Total recognized margin: $1,085.
Entry capacity increases by $585 versus single-currency mode.
Recognition rates vary by exchange, asset, and value tier.
Volatile altcoins receive larger haircuts; some are ineligible.
The convenience changes risk. Spot BTC now backs futures positions. If BTC falls, a BTC long loses while its collateral value also declines. Both sides weaken the margin ratio together.
Collateral: BTC $650 → $520.
Recognized value: $585 → $468, a $117 decline.
Position: $2,000 BTC-long notional → Unrealized −$400.
Total margin-capacity reduction: −$517.
One market decline reduces margin through two channels.
Collateral composition becomes part of risk management. Mostly BTC collateral backing a BTC long effectively doubles the same directional bet. Check actual capacity using available margin versus balance.
③ Portfolio Margin: Offsetting Risks to Reduce Requirements
This level goes beyond pooling assets. It treats all positions as a portfolio, estimates losses under adverse scenarios, and requires margin accordingly. Opposite positions that offset can substantially reduce requirements.
BTC spot worth $5,000.
BTC short futures notional: $5,000.
Multi-currency margin
The short has its own requirement, for example $500.
Portfolio margin
Spot gains on rises; the short gains on declines.
Estimated portfolio loss is smaller, for example $150.
The same positions lock roughly one third as much capital.
This makes portfolio margin useful for holding both sides simultaneously, including delta-neutral, hedging, and arbitrage strategies. A large one-directional position gains little because there is no opposite risk to offset.
The danger is when the offset disappears. If one hedge leg liquidates or is manually closed, the remaining leg becomes standalone and requirements jump. In this example, $150 returns immediately to $500. Without spare balance, the account becomes under-margined.
Greater Efficiency Also Broadens Liquidation Exposure
Capital efficiency means holding larger positions with the same money. That benefit also expands the scope exposed when liquidation arrives.
Single-currency margin
The relevant currency wallet; other spot assets remain outside it.
Multi-currency margin
All assets pledged as collateral.
Long-term spot holdings may be sold to cover margin.
Portfolio margin
The whole account, plus surging requirements if offsets disappear.
Auto-deleveraging and insurance-fund procedures may also become relevant.
This explains cases where coins accumulated for long-term holding are sold because of futures losses. Putting holdings and trading funds in one collateral pool lets futures trouble reach spot principal. The clearest protection is separating accounts: keep long-term assets elsewhere and only affordable-to-lose funds in the trading account.
Choosing a Mode
Single-currency
You are new to futures.
You want spot holdings separate from trading risk.
You hold only one or two positions at a time.
Multi-currency
You hold several assets and want collateral without selling them.
You can manage overlap between collateral-price declines and position losses.
Portfolio
You hold opposite directions simultaneously for hedging or arbitrage.
You understand requirement jumps when offsets disappear.
You consistently retain spare balance.
For beginners, the first mode is generally the clearest choice. Lower efficiency brings more predictable damage boundaries and simpler liquidation calculations. Checking a liquidation calculator and using position sizing usually matters more to outcomes than changing the mode.
Switching modes commonly requires no open positions or pending orders. Attempting an urgent switch while holding often fails, so configure it beforehand when flat. Screens and steps vary; see using OKX and the OKX futures guide for that exchange.
Before Switching
① Do you know which coins are pledged as collateral?
② Does collateral exposure move in the same direction as the position?
③ Do you understand asset-specific haircuts?
④ Are long-term holdings mixed into the trading account?
⑤ In portfolio mode, have you calculated requirements without the offset?
⑥ Have you included maintenance-margin rates rising with position-size tiers?
⑦ Does switching require closing positions?
The sixth check is frequently missed. Larger positions can require higher maintenance percentages. Using all the extra capacity after a mode upgrade can bring liquidation closer than expected. Reading more capacity as permission for more size turns the benefit directly into risk.
Key Points
② Single-currency mode separates wallets and limits damage scope.
③ Multi-currency mode pools collateral with haircuts.
④ Aligned collateral and position exposures reflect losses twice.
⑤ Portfolio mode reduces requirements through risk offsets.
⑥ Removing offsets makes requirements jump back.
⑦ Greater efficiency broadens liquidation exposure.
⑧ Separate long-term holdings from trading accounts.
A mode upgrade combines collateral; it does not earn money by itself. The extra capacity comes with more assets exposed to the same failure. If you cannot explain what is pledged, you are not yet ready for that mode.
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