Epic Market Flash Crash Killed Bull Market: Is Crypto Healthy Now?
Main Receptors:
Since September 2025, the depth of Bitcoin's order book has declined by 50%, reflecting a significant decrease in overall market liquidity.
Indicators suggest that current market weakness stems more from recent 2026 trends than a 2025 flash crash.
On October 10, 2025, exactly 6 months ago, Bitcoin (BTC) and crypto markets took a big hit. That devastating flash crash wiped out a record-breaking $19 billion in leverage, sending some altcoins down 40% to 80%. Many traders speculated that many market makers were wiped out, while others accused the Binance exchange of a clear fraud.
Has the structure of the crypto market changed after the October 2025 crash and what has changed in terms of liquidity, underlying markets and institutional parameters?
Bitcoin's total order book depth ranging from +1% to -1% by September 2025 hovers between $180 million and $260 million. Most days there would be a healthy $90 million in bids, but that wasn't the case on October 10, 2025.
During the flash crash, the depth of Bitcoin's order book entered a downward spiral, stabilizing around $150 million by mid-November 2025. Currently, the depth of Bitcoin's order book is less than $130 million, down 50% from levels seen in September 2025.
The already weak market conditions worsened further in February 2026. Bitcoin's order book depth has dropped below $60 million for 10 days as the price struggles to hold the $65,000 level. Cryptocurrency market size has decreased significantly, especially in emerging markets.
Cryptocurrency derivatives volumes have hovered between $40 billion and $130 billion in the past 30 days, falling below the commonly seen $200 billion mark in September 2025. However, since short (buyers) and shorts (sellers) are equal at all times, a decrease in appetite for futures contracts is not necessarily a profitable indicator.
Demand for bullish labor is weak, ETF volumes are lagging.
Bitcoin's sustainable futures funding volume can be used to assess traders' risk appetite.
Under normal circumstances, the index should be between 6% and 12% to cover the cost of capital. Excessive bearish interest can push the indicator below 0%, which means shorts are paying to open their positions. Data indicates stable conditions in November 2025, followed by a sharp decline in February 2026.
Interestingly, US-listed bitcoin exchange-traded funds (ETFs) were not affected by the October 10, 2025 flash crash. In fact, at the end of November, activity in those instruments hit a 20-month high of $11.5 billion a day.
Related: Binance Adds Spot Trading Defenses to Limit Unexpected Kills
Between January and March 2026, Bitcoin ETFs regularly traded above $4 billion per day, but finally fell below $3.3 billion in the first week of April. Similarly, the average daily volume of US-listed Ether (ETH) ETFs fell to $1 billion, down from $2 billion in September 2025.
Order book depth, funding volume, derivatives and ETF volumes all point to a much less healthy crypto market in April 2026 than it was 6 months ago. However, with the market structure remaining relatively stable through February 2026, the October 10, 2025 flash crash appears less relevant than previously thought.
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