How Futures Margin Works
With perpetual futures, your margin is the value you deposit to cover potential losses. When you close a trade, PnL is settled against that margin. Losses reduce it, while profits add to it.
The question is how you want to margin your trades.
You can margin with stablecoin value, such as USDT or USDC, or with coin value, such as BTC or ETH. That single choice shapes everything else: your collateral stability, your PnL currency, your leverage math, and your risk profile.
Key Takeaways
- The difference between USD-margined and coin-margined perps comes down to one choice: stablecoin or crypto as collateral.
- Stablecoin margin = fixed collateral value, linear PnL, simpler leverage math.
- Coin margin = volatile collateral, non-linear PnL, dual exposure on both your position and your margin.
- Coin-margined futures let you hedge BTC holdings without selling.
- Funding rates work the same on both. Most exchanges settle every 8 hours; Backpack settles hourly.
USDT-Margined Futures (Linear)
USDT-margined futures are the most widely traded crypto perps. You post USDT or USDC as collateral. Since stablecoins aim to hold a fixed dollar value, your margin, PnL, leverage, and liquidation price are all denominated in dollar terms.
Collateral stability simplifies risk management. Your margin does not fluctuate with the underlying asset, so leverage ratios and liquidation thresholds behave more predictably. A 2x leveraged position requires roughly a 50% adverse price move to trigger liquidation, and that math stays relatively consistent regardless of the underlying asset’s price.
PnL settles in the stablecoin you are using. Cross-pair capital efficiency is another advantage: a single USDT or USDC balance can margin positions across BTC, ETH, SOL, and other pairs without requiring you to convert into each underlying asset. USDT-margined markets also tend to offer more trading pairs and deeper liquidity than their coin-margined equivalents.
Coin-Margined Futures (Inverse)
Coin-margined futures use the underlying crypto as collateral. With BTC coin-margined contracts, you trade BTC against USD, but your margin is denominated in BTC.
The key difference is that your collateral is now volatile. If you deposit 0.1 BTC and the price drops 20%, your margin has lost 20% of its dollar value before your position’s PnL is even factored in. If the price rises, your collateral appreciates. Margin requirements effectively shift with the market.
PnL is also settled in the coin, not in dollars. If you profit on a BTC trade, you receive BTC. If you lose, you lose BTC. For traders looking to accumulate the underlying asset, this is a direct path: profitable trades grow your BTC stack without requiring a conversion step.
This creates dual exposure. On a long position with BTC collateral, a rally compounds in your favor through position gains and collateral appreciation. On a sell-off, both sides deteriorate. The position loses value, while the collateral shrinks in dollar terms, narrowing the distance to liquidation faster than an equivalent stablecoin-margined position.
On a short, the dynamics partially offset. A price drop generates BTC profit, but that BTC is now worth less in dollar terms. Conversely, a price rise erodes the short while appreciating the collateral. Traders typically run lower leverage on coin-margined contracts to account for this added complexity.
Coin-margined contracts are also available for fewer assets. Most exchanges only offer them on majors like BTC and ETH, while USDT-margined markets cover a much broader range of pairs.
Side-by-Side Comparison
Hedging with Coin-Margined Futures
One application of coin-margined futures is hedging. If you hold BTC and expect a drawdown but do not want to sell, you can deposit BTC as collateral and open a short against it. If the price falls, profits from the short can help offset the decline in your collateral’s dollar value.
The risk remains asymmetric. If BTC rallies, the short loses money and eats into your collateral. Hedging can reduce directional exposure, but it does not eliminate it. To understand the mechanics in more detail, see our guide on shorting crypto.
The PnL Math
USDT-margined: Profit = Position Size × (Exit Price − Entry Price). Linear. 1 BTC long from $60,000 to $70,000 = 10,000 USDT profit.
Coin-margined: Profit (in BTC) = Notional × (1/Entry Price − 1/Exit Price). Non-linear. On a $60,000 notional long from $60,000 to $70,000: 60,000 × (1/60,000 − 1/70,000) = ~0.143 BTC. At $70,000, that’s ~$10,000. Same dollar profit, but settled in BTC.
The coin-margined formula creates a non-linear payoff. As price rises, you earn progressively fewer BTC per dollar of movement. As price falls, you lose progressively more. This is why long positions on coin-margined contracts get liquidated faster on drops than shorts do on rallies.
After closing: if BTC continues to rise, your coin-margined profit (held in BTC) keeps appreciating. If BTC drops, that profit shrinks in dollar terms. USD-margined profit stays locked at 10,000 USDT either way.
Funding Rates
Funding works the same on both contract types. When the perp trades above spot, longs pay shorts. When it trades below, shorts pay longs. Most exchanges settle every 8 hours. Backpack settles hourly, keeping the perp price tighter to the index.
On USDT-margined contracts, funding is paid in stablecoin. On coin-margined contracts, it’s paid in BTC. Factor funding into your position’s total cost, especially if you’re holding through extended periods of positive or negative rates.
How Backpack Approaches Perpetual Futures
Backpack takes a unified approach to perpetual futures.
All perpetual markets on Backpack use USD-margined linear contracts and settle in USD. This gives traders the simplicity of stablecoin-denominated collateral: predictable margin requirements, linear PnL, and clearer liquidation behavior, without the added complexity of coin-margined exposure.
Rather than splitting balances across separate futures wallets, Backpack uses a single cross-margined account architecture across spot, lending, and perpetuals. USD and USDC are treated equivalently within the platform, while supported crypto assets such as BTC, ETH, and SOL can also contribute toward collateral.
This design allows capital to remain usable across multiple functions simultaneously. Collateral backing perpetual positions can also participate in Backpack’s built-in money markets through Auto Lend, enabling eligible balances to earn lending interest and stablecoin yield without requiring manual transfers between accounts.
Backpack also keeps perpetual infrastructure tightly integrated with the rest of the platform experience:
- Hourly funding settlements instead of the industry-standard 8-hour cycle
- Auto Realize PnL, which continuously realizes profits without requiring positions to be closed
- Shared collateral across trading, borrowing, and lending
The result is a perpetual trading system designed around capital efficiency. It combines the simplicity of USD-margined futures with a unified collateral and yield architecture.
One small strategic note: the phrase “stablecoin-denominated collateral” is okay, but since the paragraph says Backpack settles in USD, I’d consider “USD-denominated collateral” or “dollar-denominated collateral” if we want tighter product accuracy.
Trade perpetuals on Backpack: BTC/USD-PERP | ETH/USD-PERP | SOL/USD-PERP | All Markets
The Bottom Line
USD-margined futures offer stable collateral, linear PnL, and simpler risk math. Coin-margined futures offer direct crypto accumulation and dual exposure, but require more active risk management.
The right choice depends on whether you want your margin to be a stable base or a market-exposed asset. Platforms like Backpack take a unified approach by connecting fiat, stablecoin, and crypto collateral through a single margin engine that also functions as a yield layer.
Related reading: futures trading mechanics, spot markets, and types of futures contracts.
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