What a big 24-hour crypto drop actually tells you

A big red number on a price screen feels like a verdict: something broke, and everyone is leaving. Most of the time it is just a measurement, taken over one window, from one set of prices, at one moment. Read it that way and a sell-off becomes something you can take apart. This guide shows how to read a crypto sell-off using the clearest recent case, October 10, 2025, when the largest liquidation event on record turned a bad Friday into a market-wide crash. It does not tell you what the price will do next. Nothing on a 24-hour chart can.

What the 24-hour number measures

The "24h" change on a price site compares the price now with the price 24 hours earlier. Three details decide what it shows.

• It is a rolling window. The figure you see at 10:00 and the one you see at 22:00 cover different stretches of time. A crash that started 20 hours ago and a crash that started 2 hours ago can show the same red number while describing very different days.
• It is one price among many. Aggregators such as CoinGecko build a coin's price from many trading pairs: they drop outlier prices and take a volume-weighted average of the rest. A single exchange can print a much lower wick that never appears in the aggregate, or the other way round.
• It ends at the moment you look. A coin that fell hard and bounced can show a modest daily loss, while the real damage happened in an hour inside the window.

So before reacting to a number, ask three things: over which 24 hours, from which prices, and measured when?

One day, several different numbers

October 10, 2025 is a good test because so many people measured it. Here is bitcoin's move on that day as reported by three serious sources.

None of these is wrong. They start and stop at different times and use different prices. A screenshot of any one of them, shared out of context, tells you less than it seems to.

The same holds for altcoins. Decrypt reported that Solana was down 18% over the day, while CoinGecko's review notes that it briefly lost over 40% of its value before recovering part of it. Dogecoin showed a 24% loss over the last day in Decrypt's snapshot. One figure is a close-to-close change; the other is the worst point inside the day.

Why altcoins fell much further than bitcoin

Kaiko's analysis puts the gap plainly: while bitcoin fell about 7%, altcoins collapsed between 20% and 27% over the same period, and several showed far deeper intraday drawdowns.

The reason is liquidity. When sellers arrive at once, the price falls until it finds enough buyers. Bitcoin has the deepest order books in crypto. Smaller coins have thinner books, so the same wave of selling moves their price further. On October 10 even bitcoin's books thinned out: FTI Consulting reports that intraday data showed BTC's top-of-book depth shrinking by more than 90% on key venues that day, with spreads widening sharply. Market makers either widened their quotes or stepped away. Liquidity still existed, but only in small pieces.

Timing made it worse. The cascade began on Friday evening, UTC, and ran into the weekend, when crypto keeps trading while most other markets are shut and order books are usually thinner.

The engine: forced selling

A sell-off this fast is rarely a crowd of people deciding to sell at once. It is mostly liquidations: leveraged positions closed automatically by exchanges because the trader's margin no longer covers the loss. Each forced sale pushes the price down, which pushes the next position past its limit. That chain is a cascade, and our glossary entry on liquidation explains how the liquidation price and maintenance margin set it off.

On October 10 the numbers were very large, and they also show why sources disagree:

• CoinGlass, quoted by Decrypt, counted 1,618,240 traders liquidated and a total of $19.13 billion in 24 hours, and said the true figure was probably higher because one large exchange reports only one liquidation order per second.
• Kaiko counted $9.89 billion in leveraged positions liquidated over a 14-hour cascade on the venues it tracks.

Different venues, windows and reporting rules, so different totals. Both describe the same mechanism.

The cascade was also concentrated. Kaiko found that 70% of the damage happened in just 40 minutes, and that $3.21 billion in positions was wiped out in a single minute at 21:15 UTC. That is the signature of automated selling, not of a slow change of opinion.

Two side effects matter for anyone trading with leverage:

• Collateral can break too. During the worst of it, the USDe stablecoin traded far below its dollar peg on one large exchange, implying a ~35% discount there, according to FTI, while it held much closer to its peg elsewhere. Accounts that used it as collateral were marked down and pushed into liquidation. Whether one loss can drag your other positions with it depends on your margin mode.
• Hedges can be closed for you. When liquidations are not enough to cover losses, exchanges can use auto-deleveraging, which closes profitable positions on the other side. FTI notes that on October 10 some well-hedged short positions were reduced or closed this way.

What was already in place before the drop

The trigger, according to CoinGecko's review, was President Trump's announcement of 100% tariffs on Chinese imports, posted at 14:57 UTC according to Kaiko. Bitcoin's fall accelerated in the evening, and CoinGecko puts the start of the violent phase at around 20:50 UTC.

The trigger explains the timing, not the size. The size came from what was already built up. FTI reports that funding rates on perpetual futures had climbed from around 10% annualized to nearly 30% by October 6. High funding means many traders were paying to hold leveraged longs. When the shock came, those were the positions that had to be sold.

What a big drop does not tell you

• It is not a forecast. A 24-hour loss describes the past day. It does not say whether the next day is red or green.
• It is not a statement about the project. Most of the October 10 move was positioning and plumbing: leverage, thin books and forced selling. A coin's fundamentals do not change by a third in an evening.
• It does not show who sold. Liquidations, panic selling and hedges being closed all print the same red candle.
• It is one market among several. Spot ETF flows are a separate, slower record of unleveraged demand; see what bitcoin ETF flows really measure.

How to read a crypto sell-off, step by step

1. Pin down the window. Note the time and the 24-hour period the number covers. Compare it with the low inside the day.
2. Check the source of the price. An aggregate price and one exchange's chart can differ a lot in a fast market.
3. Compare bitcoin with the rest. If altcoins fell several times more than bitcoin, liquidity and leverage are probably doing the work.
4. Look at liquidation data. A large spike in forced closures says the move was mechanical.
5. Look at what came before. Very high funding and open interest show how much leverage was waiting to be unwound.
6. Check your own exposure, not the headline. The question is what the same move would do to your account. Size positions so that a day like this is survivable: our guide to position sizing shows how.

FAQ

What is a 24-hour price change in crypto?

It is the difference between the price now and the price exactly 24 hours earlier, usually as a percentage. The window rolls forward every minute, so the same day can show very different numbers depending on when you look.

Why do different sites show different drops for the same day?

They use different prices, different exchanges and different time windows. On October 10, 2025, serious sources reported bitcoin's fall as anything from about 7% to 14.5%, depending on where they started and stopped measuring.

What caused the October 10, 2025 crash?

The trigger was the tariff announcement on Chinese imports. The size came from elevated leverage, thin weekend liquidity and a cascade of liquidations, which pushed prices far below where ordinary selling would have taken them.

Does a big drop mean the price will keep falling?

No. A 24-hour change describes what already happened. It says nothing reliable about the next day, in either direction.

Why do altcoins fall more than bitcoin in a crash?

Their order books are thinner, so the same amount of forced selling moves the price further. Many are also held with high leverage, which adds more forced sales once the price starts to slide.