Altcoin Market Breaches $900B Twice in 24 Hours, Ethereum Drops 21% Since June 1

According to Coingecko data, the altcoin market capitalization fell below $900 billion twice within 24 hours on Thursday (June 25). The first breach came shortly after noon on June 24, when the market briefly dropped to $872 billion, rebounded past $950 billion by midnight, then fell again to $872 billion at 9 a.m. EST on June 25.

Ethereum (ETH), which accounts for roughly one-fifth of the aggregate altcoin market cap, led the decline with a plunge to $1,531, its lowest level in 2026. Since June 1, when ETH traded above $2,000, the asset has declined 21%, dragging the total altcoin market from $1.1 trillion down to $900 billion. Analysts warned that further weakness could push the monthly RSI to historic oversold levels below 30 for the first time.