The altcoin market capitalization briefly dropped to $1.28 trillion on November 18, as Bitcoin's price fell below $90,000. Ethereum (ETH) saw a dip to $2,944 before rebounding to $3,050, while the overall altcoin market declined by 4% within 24 hours. This downturn was largely attributed to investor apprehensions about a potential AI bubble burst, following remarks by Alphabet CEO Sundar Pichai. Major altcoins such as XRP, BNB, SOL, and ADA experienced notable losses. Zcash (ZEC) notably fell by 13.8% in 24 hours, despite having achieved a 24% gain over the past week. The market's reaction underscores the volatility and sensitivity to broader tech sector developments.