Crypto market cap leaps $800B in Q3, but spot volume drops 14%

CoinGecko's Q3 2026 report shows the total crypto market cap rose by $800 billion during the quarter, even as spot trading volume on the top 10 centralized exchanges fell 14.2%. Perpetual futures open interest ended September above $100 billion, indicating leverage and derivatives activity held up while spot turnover cooled. For traders, the divergence suggests the rally was driven more by derivatives positioning and holding than by fresh spot demand, which can leave prices vulnerable to sharp deleveraging moves.