Ethereum Drives Altcoin Season Surge Ahead of September 2025

Coinbase

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  • Altcoins have surged over 50% since July, signaling early rotation from Bitcoin.
  • Ethereum’s institutional demand is driving market momentum and boosting related tokens.
  • Rate cuts and fresh liquidity could trigger a full altcoin season in September.

The crypto market may be on the brink of one of its most exciting phases yet—an altcoin season. After months of sideways movement, altcoins have jumped over 50% in value since early July, now reaching a combined market cap of $1.4 trillion. Coinbase analysis points to growing Ethereum (ETH) demand from institutional investors as a key driver of this rise, setting the stage for potentially explosive gains in September.

Bitcoin Dominance Drops, Spotlight on Altcoins

Coinbase research highlights a decline in Bitcoin dominance from 65% in May to 59% in August, signaling a shift toward smaller coins. The Altcoin Season Index, currently at 53, suggests the market is in early stages of rotation but hasn’t yet reached full alt season territory (75+). Analysts believe new liquidity inflows in late Q3 and early Q4 2025 could accelerate capital rotation into altcoins, amplifying gains for traders positioned in promising projects.

Liquidity Boost and Rate Cuts Fuel Optimism

The timing for an altcoin rally appears favorable, according to Coinbase. Anticipated interest rate cuts by the U.S. Federal Reserve in September or October may encourage investors to move capital into riskier assets like cryptocurrencies. With $7.2 trillion sitting in U.S. money market funds, confidence-driven inflows could dramatically increase market activity. Improved liquidity, reinforced by clearer stablecoin regulations, is further creating fertile ground for altcoin growth.

Also Read: How a Single Approval Let an MEV Bot Steal $300,000 From Coinbase Today

Ethereum at the Center of the Market Shift

Ethereum’s popularity among institutional investors is reshaping the crypto landscape. Major ETH treasury holders now control nearly 3 million ETH, including Bitmine Immersion’s 1.15M ETH and Sharplink Gaming’s 598.8K ETH holdings. This demand is spilling over to Ethereum-linked tokens such as Lido DAO (LDO), which has seen prices climb nearly 60% this month, fueled by liquid staking services and strong market interest.

Coinbase suggests the market is entering an early rotation from Bitcoin to altcoins, with September poised to be a pivotal month. Traders may see increased price swings and higher profit opportunities, particularly for those strategically positioned in Ethereum and related altcoins.

Disclaimer: The information in this article is for general purposes only and does not constitute financial advice. The author’s views are personal and may not reflect the views of Chain Affairs. Before making any investment decisions, you should always conduct your own research. Chain Affairs is not responsible for any financial losses