Key points to remember:
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Bitcoin order book depth has fallen by 50% since September 2025, signaling a substantial decline in overall market liquidity.
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Indicators suggest that the current market fragility stems more from recent trends in 2026 than from the flash crash of 2025 itself.
Bitcoin (BTC) and the crypto markets suffered a major blow on October 10, 2025, precisely 6 months ago. This devastating flash crash shattered a record $19 billion in leveraged positions while some altcoins crashed by 40-80%. Many traders speculated that several market makers had been eliminated, while others accused the Binance exchange of blatant manipulation.
Has the crypto market structure actually changed after the October 2025 crash, and what has changed in terms of liquidity, derivatives markets, and institutional settings?
Bitcoin’s overall order book depth, ranging from +1% to -1%, typically hovered between $180 million and $260 million as of September 2025. Most of the time there would be a healthy $90 million in bids, but that was not the case on October 10, 2025. A mix of technical issues at Binance and automatic deleveraging on decentralized exchanges caused a temporary lack of liquidity.
During the flash crash, Bitcoin’s order book depth entered a downward spiral, stabilizing at nearly $150 million by mid-November 2025. Currently, Bitcoin’s order book depth rarely exceeds $130 million, down 50% from levels seen in September 2025.
The already fragile market conditions deteriorated further in February 2026. Bitcoin’s order book depth plunged below $60 million for almost 10 days as the price struggled to maintain the $65,000 level. Cryptocurrency market volumes have declined significantly, particularly in derivatives markets.
Cryptocurrency derivatives volumes have hovered between $40 billion and $130 billion over the past 30 days, below the $200 billion mark commonly seen in September 2025. Nonetheless, the diminishing appetite for futures is not necessarily a bearish indicator, as long (long) and short (seller) positions are tied at all times.
Bullish Leverage Demand Remains Weak, ETF Volumes Lag
The Bitcoin perpetual futures funding rate can be used to gauge traders’ risk appetite.
Under normal conditions, the indicator should be between 6% and 12% to compensate for the cost of capital. Excessive demand for bearish leverage can push the indicator below 0%, meaning it is the shorts who pay to keep their positions open. The data indicates stable conditions throughout November 2025, followed by a sharp decline in February 2026.
Interestingly, volumes of US-listed spot Bitcoin exchange-traded funds (ETFs) were unaffected by the flash crash of October 10, 2025. In fact, in late November, activity on these instruments reached its highest level in 20 months, at $11.5 billion per day.
Related: Binance adds guardrails for spot trading to limit abnormal executions
Bitcoin ETFs regularly traded at volumes above $4 billion per day between January and March 2026, but ultimately fell below $3.3 billion in the first week of April. Likewise, Ether listed in the United States (ETH) Average daily ETF volume fell to $1 billion from $2 billion in September 2025.
Order book depth, funding rate, derivatives and ETF volumes all point to a much less healthy cryptocurrency market in April 2026 compared to 6 months prior. However, given that the market structure remained relatively firm until February 2026, the relevance of the October 10, 2025 flash crash appears much less than previously imagined.
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