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What Is an Insurance Fund? How Perps Exchanges Protect Traders

An insurance fund is a reserve of capital held by a perpetual futures exchange to absorb losses from liquidated positions that become bankrupt. When a trader's position is liquidated but the remaining collateral is insufficient to cover the full loss, the insurance fund steps in to make up the difference. Without it, those losses would be passed on to other traders on the platform, undermining confidence in the exchange.

Why the Insurance Fund Exists​

In leveraged trading, liquidation does not always happen at the exact liquidation price. During fast market moves, a position may be closed at a price worse than its bankruptcy price, meaning the trader's margin is not enough to cover the total loss. This creates a deficit that someone must absorb.

Consider this scenario:

  1. A trader opens a $40,000 long BTC position at 40x leverage with $1,000 margin
  2. BTC drops sharply, and the liquidation engine triggers at the liquidation price
  3. Due to slippage in a fast-moving market, the position is actually closed $50 below the bankruptcy price
  4. The trader's $1,000 margin only covers $950 of the loss, leaving a $50 deficit

Without an insurance fund, that $50 deficit would be deducted from other traders' profits. The insurance fund absorbs it instead, keeping the system fair.

How the Insurance Fund Is Built​

The insurance fund grows through several sources:

SourceHow It Works
Liquidation surplusWhen a position is liquidated above the bankruptcy price, the leftover equity goes to the fund
Liquidation feesA small penalty charged on liquidated positions is added to the fund
Trading fee allocationSome exchanges direct a portion of trading fees to the insurance fund
Initial seedingExchanges often contribute an initial capital deposit to establish the fund

Example of Liquidation Surplus​

A trader has a long position with a liquidation price of $48,000 and a bankruptcy price of $47,800:

  • The liquidation engine closes the position at $48,000
  • The margin minus losses leaves $200 in equity above the bankruptcy price
  • That $200 surplus goes to the insurance fund

This is the most common way the fund grows during normal market conditions. Profitable liquidations happen frequently when markets move at a moderate pace.

When the Insurance Fund Pays Out​

The insurance fund is drawn upon when:

  1. Bankruptcy price is breached: The position is closed below its bankruptcy price (longs) or above it (shorts), leaving a negative balance
  2. High-volatility liquidation cascades: During flash crashes or pumps, many positions liquidate at once, and market impact causes fills worse than bankruptcy prices
  3. Thin order book conditions: In low-liquidity assets, large liquidations may move the market significantly past bankruptcy prices

Insurance Fund and Auto-Deleveraging​

The insurance fund is the first line of defense. If the fund is large and healthy, all bankrupt position losses are covered without affecting any other trader. However, if the insurance fund is fully depleted during an extreme event, the exchange activates auto-deleveraging (ADL) as a last resort.

The priority chain looks like this:

  1. Trader's margin absorbs losses first
  2. Insurance fund covers any remaining deficit
  3. Auto-deleveraging kicks in only if the insurance fund cannot cover the deficit

This is why a well-funded insurance pool matters to every trader on the platform, not just those being liquidated.

Why Traders Should Care​

Even if you manage your risk well and never get liquidated, the insurance fund affects you:

  • Protection against socialized losses: Without the fund, bankrupt positions would reduce your profits through socialized loss mechanisms
  • Exchange stability: A large insurance fund signals a healthy and resilient trading platform
  • ADL risk: A depleted fund increases the chance of auto-deleveraging affecting your profitable positions
  • Market confidence: Traders are more willing to provide liquidity on platforms with robust insurance funds

Monitoring the Insurance Fund​

Many exchanges publish their insurance fund balance in real time. Watching this metric helps you gauge:

  • Market stress levels: Rapid drawdowns in the fund indicate a period of heavy liquidations
  • Platform health: A steadily growing fund shows the exchange is operating normally
  • ADL probability: A very low fund balance relative to open interest suggests higher ADL risk

Best Practices​

  1. Use appropriate leverage: Positions liquidated at moderate leverage are more likely to contribute surplus to the fund rather than drain it
  2. Set stop-losses: Exiting positions via a stop-loss before liquidation means your trade never touches the insurance fund at all
  3. Be cautious in extreme volatility: During rapid market moves, the insurance fund can deplete quickly, raising ADL risk for all participants
  4. Diversify position sizes: Avoid concentrating your entire account into one highly leveraged trade