Derivatives 4 / 6
Derivatives · Level 3Lesson 4 of 5

Liquidations and cascades: why crypto can fall so fast

A liquidation is a forced market order. When many leveraged positions sit close together, one move can set them off one after another — and price goes further and faster than anyone planned.

You will learn
  • What happens when a position is liquidated
  • Why liquidations come in cascades
  • What a cascade looks like in open interest — and what the data cannot show

Before you start: The lessons on perpetual futures and leverage, and on open interest.

A forced market order

When a leveraged position's margin falls to its maintenance margin, the exchange's engine takes it over and closes it with an order that trades at once against the book — in effect a market order: a liquidation. A liquidated long becomes a sell; a liquidated short becomes a buy. The trader has no say in when, or at what price.

The check runs on the mark price, so a single odd trade does not trigger it — but a real move does, and the closing orders hit the order book like any other market order.

Why they cascade

Leveraged positions opened around the same price, at the same leverage, have liquidation prices close together. When price falls into the first of them, their forced sells push it lower — into the next ones. Each wave of liquidations makes the next one more likely, until the selling runs out of leveraged longs to close, or meets enough buyers.

The same works upward: liquidated shorts are forced buyers, and a rise can feed itself the same way — a short squeeze.

One real afternoon

Cascade — the afternoon of 2 October 2026 on Binance's BTC perpetual. At 12:00 UTC the perpetual touched 87,250; by 13:00 open interest stood at about 99,800 BTC. In the 14:00 hour price fell 1.02%, takers sold 5,182 BTC more than they bought, and open interest dropped 2.96% — the largest one-hour drop of the 30 days. Longs opened at 86,769 just after 13:00 with 100× or 50× leverage would have been liquidated in that hour (example maintenance margin 0.5%). From 14:00 to 18:00 price fell 2.06% and open interest 4.45%: 4,438 BTC of positions closed. In the next three hours open interest rose 3.83% again.

A squeeze, recorded live

The same thing upward, second by second. We recorded Binance's liquidation stream on 27 October 2026 and caught a small short squeeze on the BTC perpetual: a burst of market buying, then shorts liquidated one after another — each a forced buy.

Squeeze — the BTC perpetual on 27 October 2026, second by second. Before 21:31 UTC only 4, 10 and 14 BTC traded in three minutes. At 21:31:33 takers bought 1,473 BTC in one second and price jumped from 80,798.1 to 81,008.4. From 21:31:34 to 21:31:50 the stream reported 12 short liquidations, 31.3 BTC (about $2.5M), as a second burst took price to 81,244.5 — a lower bound, since the stream sends at most one per second. That minute traded 4,492 BTC.

Notice the order: the burst of buying came first, and the liquidations followed it. A cascade needs a push to start — then the forced orders keep it going.

What you can see, and what you cannot

  • Open interest falls the same way whether a position was closed by choice or by force. A sharp drop with a fast move is the typical picture of liquidations, but not proof of how many there were.
  • Liquidation feeds exist: Binance publishes liquidation orders as they happen. But it sends at most one per coin per second — the latest — and there is no public history to look back at, so any total built from it is a lower bound.
  • Liquidation maps — the "heatmaps" many tools draw — are estimates of where leveraged positions might be liquidated, built from assumptions about entry prices and leverage. They are models, not orders waiting in a book. The terminal draws something different: the liquidations Binance actually reported, collected live from the moment the chart was opened — real, but a lower bound for the reason above.
Check yourself · 1 of 3A leveraged long is liquidated. What order reaches the market?
Show the answer

Closing a long means selling. The engine sells at the market, which adds to the selling pressure — the start of a possible cascade.

Check yourself · 2 of 3Why do liquidations tend to come in cascades?
Show the answer

Forced market orders move price into nearby liquidation prices, setting off the next wave.

Check yourself · 3 of 3Open interest falls 3% in an hour while price drops. What can you say for sure?
Show the answer

Open interest counts contracts closed, not why. Forced and chosen closes look the same in it.

Takeaways
  1. A liquidation is a forced market order: liquidated longs sell, liquidated shorts buy.
  2. Liquidation prices of similar positions cluster, so one wave can set off the next — downward (longs) or upward (shorts, a squeeze).
  3. In open interest a cascade looks like a sharp drop during a fast move — forced and chosen closes look alike.
  4. Liquidation feeds undercount; liquidation maps are estimates, not orders.

Open the BTC perpetual in the terminal — liquidations show as circles on its chart

Further reading

Education only, not financial advice · Updated 27 Oct 2026 · Data: Binance · Report a mistake