What is a liquidation, and how does a cascade start?

A position closes itself at three in the morning and nobody pressed sell. The price moved a few percent against a trader holding more than their own funds could cover, and inside an exchange's risk engine a threshold was crossed. What follows is mechanical: the position is sold whether or not anyone wants to buy it. That is a liquidation, and enough at once start shaping the price everyone else sees.

What is a liquidation?

A liquidation is the forced closing of a position by the platform holding it, triggered when the collateral behind it no longer covers its losses. It is not a penalty applied case by case but an automatic rule inside the risk engine, firing the moment a position's margin falls under a stated minimum.

Two ingredients are required: borrowed exposure and a price that moves. A coin bought outright has nothing to liquidate, since a fall in price costs you value but owes nobody anything. Borrow to hold more, through a margin account, a perpetual future (opens in a new tab) or a lending protocol, and a liquidation becomes possible the moment the collateral stops covering the loss.

What actually triggers one?

A margin ratio crossing its maintenance level, not a round number on a chart. Every margin position carries two figures: the collateral posted against it and the maintenance margin, which is the minimum the platform will accept before acting. As the price moves against the position the first shrinks towards the second. When they meet, the engine closes the position, usually at market and with a fee attached.

The price the engine watches is often not the last trade on its own book. Most derivatives venues liquidate against a mark price drawn from an index of several exchanges, so that one thin book cannot manufacture liquidations on its own. A trader can be closed at a level that never appeared on their own chart.

Why does one liquidation make the next more likely?

Because a liquidation is a market order nobody chose to place, landing on the same order book as everyone else's trades. Selling into a thin book pushes the price further than the size alone suggests, which is ordinary slippage (opens in a new tab) with a forced seller behind it. That lower price moves the next position closer to its own maintenance level, and if it crosses, another forced sale arrives on a thinner book.

A cascade is that loop running through the order book rather than through anyone's decision. It needs no panic, no rumour and no bad news. It needs positions clustered near similar thresholds and a market too thin to absorb them, which is part of why these moves run hardest in quiet hours and smaller coins.

What stops a cascade?

Platforms commonly liquidate in tranches rather than all at once, closing enough to restore its margin instead of the whole position. Many maintain an insurance fund to absorb the gap when a position closes past the point its collateral covered, and where that fund falls short some venues turn to auto-deleveraging (ADL), which closes profitable positions on the opposite side to settle it. None of this stops the loop: it rations the damage and decides who absorbs it. The loop runs into the depth of the market at that moment, and depth thins out first when a cascade starts.

How does an on-chain liquidation differ?

The trigger is public and the liquidator is a stranger. On a lending protocol the health of every borrowed position is visible on-chain, and the protocol pays an outside party a bonus for closing any position that drops below its required collateral ratio. Bots compete for that bonus, so a position crossing its threshold is often closed within a block or two.

The price deciding all of this comes from an oracle (opens in a new tab), which makes the oracle's behaviour part of the risk. A feed that updates slowly during a violent move can mark positions as liquidatable when a live price would have spared them. A contract cannot check a price by itself, so what the oracle reports is what the protocol treats as true.

Where Northtape fits

Northtape runs no exchange, holds no positions and offers nothing to trade on margin. It is a news desk. Stories about forced liquidations and halted withdrawals are detected by the Risk Radar counterparty lens.

FAQs

Can I be liquidated if I only buy coins outright? No. A liquidation requires borrowed exposure: a margin account, a derivatives position or a loan against collateral. A holding bought with your own funds can fall in value, though nothing forces it to close.

Does a liquidation mean losing everything I put in? Not necessarily. Many platforms close in tranches, and whatever remains after the loss and the fee stays yours. In a fast move a position can still close past the point its collateral covered, the gap an insurance fund exists to absorb.

Why did my position close at a price I never saw? Most venues liquidate against a mark price built from several exchanges, not their own last trade. The trigger is read from that index, so it can sit away from the candle on your screen.

What is auto-deleveraging? It is the last resort when an insurance fund cannot cover a shortfall: the platform closes some profitable positions on the opposite side to settle it. ADL is uncommon, though it means a winning position can be closed through no fault of its own.

None of this is investment advice. It describes how a forced closure works, not whether to hold a position that can be liquidated, at what size or where. Borrowed exposure carries a risk of loss an outright holding does not, and nothing here suggests where any price may go next.