Altcoin Market Cap Breaches $900B Twice in 24 Hours

The aggregate altcoin market capitalization fell below $900 billion twice within a 24-hour window, hitting a low of $872 billion each time, according to Coingecko data.

The first breach came shortly after noon Wednesday during a broad market rout. The total rebounded past $950 billion by midnight, then slipped again at 9 a.m. EST Thursday, retesting the $872 billion floor. The index has since stabilized near $900 billion.

The sell-off has pushed the TOTAL3ES index – which tracks crypto market cap excluding bitcoin, ether, and stablecoins – to its lowest one-month relative strength index reading on record, tying the lows from the FTX collapse. Analysts said any further drop would push the monthly RSI below 30 for the first time, a level that typically signals oversold conditions.

Ethereum led the decline among large-cap altcoins, falling to a new year-to-date low of $1,531. ETH accounts for roughly one-fifth of the aggregate altcoin market cap. It dropped nearly 3% in the session and has fallen 21% since June 1, when it traded just above $2,000. That slide alone has pulled the total altcoin market cap from $1.1 trillion to $900 billion.

BNB slipped 1.2% in 24 hours. XRP hit a fresh year-to-date low of $1.01, down 2.5%. XLM and XMR fell 4.4% and 4.7%, respectively. HYPE was a rare outlier, gaining 3.7% over the same period. LAB, the only digital asset with double-digit gains over the last seven days, was flat near $18.21.

Bitcoin touched its weakest level of 2026 on Thursday, adding to the broader pressure on risk assets.