Altcoin spot volume has surged to four times Bitcoin’s size, hitting a yearly high driven by Bitcoin’s 40% Q3 rally. Altcoin open interest dominance reached 41%, a level that preceded a Bitcoin pullback in December 2024. Altcoin market cap rose 20% from $1T to $1.2T. Altcoin sell-offs also spiked to a yearly high, increasing selling pressure on the segment. However, stablecoin reserves declined despite Bitcoin’s drop, suggesting ongoing Bitcoin accumulation that could support an altcoin rebound.
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