CryptoSlate
US ETFs tied to Ethereum, XRP and Solana drew nearly $59 million on Sept. 9 while Bitcoin products lost $120.24 million. The rotation did not become a broad altcoin rally: BlockchainCenter's Altcoin Season Index was 37, below the 75 level that marks when 75% of the top 50 eligible tokens outperform Bitcoin over 90 days.
Over 30 days, Bitcoin ETFs led with $3.42 billion in net inflows, followed by Ether at $1.76 billion, Solana at $200.88 million and XRP at $185.32 million. Those four assets captured roughly $5.57 billion of $5.64 billion in completed spot crypto ETF inflows.
The pattern shows institutions rotating within a small regulated ETF club, not sending capital across the wider token market. Bitcoin still held 56.64% of crypto market capitalization, close to 56.02% three months earlier.
Frequently asked questions
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What threshold does BlockchainCenter use to define an altseason?
BlockchainCenter uses 75 as the threshold. It means 75% of the top 50 eligible tokens must outperform Bitcoin over 90 days.
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Which assets captured most of the 30-day spot ETF inflows?
Bitcoin, Ether, Solana and XRP captured roughly $5.57 billion of $5.64 billion in completed spot crypto ETF inflows over 30 days.
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How did Sept. 9 ETF flows split between altcoins and Bitcoin?
Ethereum, XRP and Solana drew nearly $59 million combined, while Bitcoin products lost $120.24 million.
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What does Bitcoin's 56.64% market share indicate?
Bitcoin held 56.64% of total crypto market capitalization, close to 56.02% three months earlier, indicating its share remained broadly stable.
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Why has ETF rotation not spread across the wider token market?
The flows are concentrated in a small group of regulated products, so institutions can rotate among major ETF categories without reaching smaller altcoin categories.
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