Bitcoin and Ether Liquidity Rebuilt a Year After the $19 Billion Flash Crash, Altcoins Left Behind
Cryptocurrency

Bitcoin and Ether Liquidity Rebuilt a Year After the $19 Billion Flash Crash, Altcoins Left Behind

Majals’ order books now run deeper than before the crash

One year after the largest liquidation event in crypto history, the market’s plumbing tells a split story. Bitcoin and ether order books hold more resting liquidity today than on the day of the crash or at the start of this year, according to fresh CoinDesk Research data. Smaller tokens and spot trading activity, however, have not followed.

The flash crash of Oct. 10, 2025 remains the benchmark for how quickly crypto liquidity can evaporate. Days after hitting a record high above $126,000, bitcoin had edged back to $122,600 on the morning of that Friday. Hours later it had plunged below $105,000, with much of the decline compressed into minutes during thin evening trading in the United States, after President Donald Trump announced 100% tariffs on Chinese imports. More than $19 billion in leveraged positions were liquidated in a single day.

To gauge the recovery, CoinDesk Research compared market depth across major centralized exchanges on four dates: Jan. 1, 2025; Oct. 10, 2025; Jan. 1, 2026; and this week. Depth measures the value of buy and sell orders resting near the current price. The deeper the book, the more volume a large trade can absorb without moving the market. It is the single best proxy for whether real capital has come back.

The headline finding is unambiguous. Bitcoin’s order book is deeper now than on any of those earlier dates. On Oct. 7, about $11.7 million sat within 1% of the price. That is roughly 75% more than on crash day a year earlier, up from about $9 million at the start of this year and about $6.9 million at the start of 2025.

Crucially, this is not a price effect. Bitcoin is about one-third cheaper than it was before the crash, so a deeper book measured in dollars reflects more capital committed by market makers, not simply less valuable coins. Most of the improvement sits near the price, where market makers quote most actively. Further out, at 5% from the price, depth of around $24 million is roughly where it was in January 2025.

Ether’s recovery is in some ways stronger. Depth within 0.5% of the price has more than doubled since crash day, to about $4.2 million. At 1%, it has risen by about three-quarters to roughly $5.3 million, above both January readings.

“The majors’ deepening is real capital, not a price effect,” CoinDesk Researcher Saksham Diwan said.

For traders and institutions, the practical implication is straightforward. Large orders in bitcoin and ether can now be executed with less slippage than at any point measured in the study, including the complacent days before the crash. The market structure that failed so spectacularly on Oct. 10, 2025 has, for the two largest assets, been rebuilt on stronger foundations.

The rebuilt books received an early stress test this week. As the market sold off, bitcoin’s 1% depth fell about 12% between Oct. 7 and Oct. 8. Ether’s tightest band thinned slightly, though orders further from the price increased. That books can absorb a sell-off and remain deeper than pre-crash levels is itself a signal of resilience that was absent a year ago.

Altcoins tell the opposite story

For altcoins, the picture is reversed. In CoinDesk Research’s basket of altcoins, dollar depth was greatest on Jan. 1, 2025, and has been lower on each date measured since. Depth at 5% from the price is down about a third since the start of 2025, to around $2 million. Closer to the price, at 1%, it has fallen by about a sixth.

Measured in tokens, altcoin depth looks healthier. It peaked on Jan. 1 this year and has eased only modestly since. But analysts said that token-unit recovery was mostly a function of falling prices, masking a steady erosion of committed capital. In other words, more tokens are quoted, but each is worth less, and the dollars actually at risk near the price have thinned out.

This divergence matters for anyone trading outside the top two assets. Thinner books mean sharper moves on modest volume, wider effective spreads, and greater vulnerability to exactly the kind of cascading liquidations that defined the Oct. 10 event. Altcoins were hit hardest during the crash, and the data suggests they remain the market’s structural weak point.

The pattern also reflects where institutional interest has settled. Market makers allocate capital where flow is deepest and counterparties are most reliable, and that calculus has favoured bitcoin and ether almost exclusively. The long tail of the market, by contrast, is increasingly left to retail flow and thinner competition between quoting firms.

Spot volumes remain well below the crash-week peak

Spot trading has not recovered alongside order book depth. Weekly spot volume on centralized exchanges averaged around $279 billion over the four weeks to Sept. 27, according to CoinDesk Research, nearly two-thirds below the $801 billion traded in the week of the crash.

Activity bottomed out in August, when weekly volume fell to around $135 billion, and has roughly doubled since. But it remains well short of the levels seen around the crash, let alone the speculative frenzy that preceded it.

The combination of deeper books and lower turnover carries a double meaning. On one hand, the market can absorb large trades more efficiently, which is a precondition for institutional participation. On the other, the absence of volume suggests that the recovery in liquidity is being driven by a smaller number of professional market makers committing capital, rather than a broad return of trading interest.

That is a more mature market, but also a more concentrated one. Fewer participants providing more of the resting liquidity means the behaviour of a handful of firms now matters more at moments of stress. The Oct. 7 to Oct. 8 depth drawdown in bitcoin, while modest, is a reminder that books can thin quickly when volatility returns.

What the divergence means for the year ahead

Crypto’s liquidity vanished in hours on Oct. 10, 2025, and where it would next settle was the open question. The answer, a year on, is bitcoin and ether.

“A year ago, we wrote that liquidity was thin and fragmented, and that it was unclear where capital would rotate once the dust settled. We now have an answer: bitcoin and ether,” said Joshua de Vos, research lead at CoinDesk. “Market makers have returned to majors, with liquidity above pre-crash levels, whilst altcoin liquidity continues to trend down as a whole. Beyond a select few alts, I expect this divergence to persist into next year as majors continue to dominate institutional interest and volumes.”

That expectation has consequences across the market. For exchanges, the volume mix is consolidating further around the majors, pressuring listing economics for smaller tokens. For fund managers, the liquidity gap widens the practical difference between holding bitcoin or ether, which can be traded in size, and holding altcoins, which increasingly cannot. For regulators, the data reinforces the case that market depth, not price, is the better measure of systemic resilience in crypto markets.

The anniversary also reframes what the crash actually was. It was not a solvency event like the collapses of earlier cycles. It was a liquidity event, triggered by a macro shock, amplified by leverage, and resolved not by bailouts but by market makers deciding where to redeploy. Their verdict, rendered in dollars of resting orders, is that the majors are worth backing and the long tail is not.

Whether that verdict holds depends on volumes returning. Deeper books with thin turnover is a stable configuration only so long as no fresh shock forces a rapid repricing. The market has rebuilt its defences for the two assets that matter most. It has not rebuilt its appetite.

For ongoing coverage of the market’s largest asset, see our Bitcoin coverage.

The bottom line

A year after $19 billion in leveraged positions were wiped out in a day, bitcoin and ether order books are deeper in dollar terms than before the crash, despite prices being materially lower. That is real capital returning. Altcoin liquidity, by contrast, has eroded steadily since the start of 2025, masked by falling token prices, and spot volumes sit nearly two-thirds below crash-week levels. The market has become structurally safer for the majors and structurally riskier for everything else. Traders should treat the two halves of the market accordingly.

CN

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