The Insurance Fund: A Quiet Mechanism That Probably Saves Your Account
If you have been around perpetuals for more than a year you have heard the horror stories. A trader gets liquidated in a flash crash, the order book is empty, the liquidation engine cannot close the position at the calculated price. The shortfall has to go somewhere. On the wrong kind of exchange, "somewhere" means the profitable traders on the other side. Their gains get clawed back to cover the shortfall.
That mechanism has a name — auto-deleveraging, or ADL, or socialised loss. It is the worst possible outcome for the traders who actually called the move right: you predicted it, you held the position, you made money, and then the exchange takes some of it back because someone else over-leveraged on the other side.
The cure for ADL is the insurance fund. We figured it was worth writing about clearly, because most retail traders only learn about it after something has gone wrong.
What the Fund Is
It is a pool of stablecoin held by the exchange that absorbs the difference between a position's calculated liquidation price and the actual close price when the liquidation engine cannot fill at the target.
Mechanically: when you are liquidated, the engine does not need to close your position at exactly the liquidation price. It typically fills slightly worse — slippage, market impact, the usual costs. If the actual fill comes in better than your bankruptcy price (the price at which your entire margin is wiped out), the difference flows to the insurance fund as a surplus. If the actual fill is worse than bankruptcy, the fund pays the gap.
The fund grows during normal markets. Every liquidation that clears within the bankruptcy buffer contributes a small surplus. The fund draws down during stress — flash crashes, gap moves, anything that creates a wide spread between calculated and actual liquidation prices.
A healthy insurance fund means no ADL. Profitable traders keep their profits. The exchange absorbs the tail risk that should always have been the exchange's job to absorb.
How LMEX's Fund Works in Practice
The fund balance is published on our public `/v1/insurance` endpoint. You can check it any time you want, and we would suggest you do so before depositing serious capital on any exchange, ours included.
A few specifics that matter. Contributions come from two sources: every liquidation that fills better than bankruptcy contributes the surplus, and a small portion of trading fees from leveraged contracts flows into the fund. Withdrawals only happen when a liquidation fills worse than bankruptcy, which in our experience is rare during normal volatility but inevitable during stress events.
The fund is asset-segregated per quote currency. USDT-margined contracts draw from the USDT fund. If we ever list inverse contracts, those would have their own fund in the relevant base asset.
Where It Earns Its Keep
Two scenarios where the fund matters:
A flash crash. BTC drops 12% in 90 seconds. Thousands of leveraged longs hit liquidation triggers simultaneously. The engine works through the book taking out resting bids, but the book runs out before all positions can be closed. Without an insurance fund, the shortfall has to come from somewhere — on weaker exchanges, it comes from the winning shorts. On LMEX the fund absorbs it.
An equity perp earnings gap. NVDA misses badly, the perpetual gaps 9% in the first minute. Leveraged longs above 10× get caught. Same dynamic — engine needs to close positions, book is thin and one-sided, insurance fund covers the gap between calculated liquidation and actual fill.
In both cases the trader on the wrong side still loses their margin. The insurance fund does not bail out losers. What it does is make sure the winners actually receive their full P&L.
What to Check Before Trusting Any Exchange
The insurance fund is one of the few hard numbers worth checking on any perpetuals venue:
Look at the size. A fund holding 0.1% of total open interest is not going to survive a real stress event. We would look for funds that are at least a few percent of OI on the asset, ideally higher on more volatile markets.
Look at the history. Has the fund ever depleted? If yes, what happened to losing positions — did ADL kick in, did the exchange backstop, did the operator inject capital? Each answer tells you something about how the venue treats its users.
Look at the growth rate. A fund that grows slowly during quiet periods will struggle during stress. A fund that grows aggressively buys margin for the next bad day.
Be honest about your own leverage. The most reliable way to never need the insurance fund is to never be on the wrong side of one of these events. Lower leverage, tighter stops, smaller positions during high-vol regimes — all the unglamorous stuff. The insurance fund is a backstop, not an excuse to over-leverage.
We publish the LMEX fund balance live. If you trade leveraged perpetuals on any platform, knowing where to find that number and checking it occasionally is one of the more useful habits you can build.
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