Guide · Risk Management
Why Altcoins Fall Harder Than Bitcoin When the Market Breaks
On October 10, 2025, Bitcoin fell about 17% peak to trough, Ether about 22% — and one mid-cap AI token lost roughly three-quarters of its price in half an hour. That gap is not random.
Crypto prices tend to move together, but not by the same amount. When the whole market sells off at once, the smaller and less liquid the coin, the deeper the drop usually goes. The pattern shows up in almost every broad crypto crash, and it matters more for how much you put into a position than for which coin looks most promising.
The clearest recent illustration is the evening of October 10, 2025. On Binance's hourly data, Bitcoin fell from about $122,550 to $102,000 that day — roughly 17% peak to trough. Ether went from about $4,394 to $3,435, around 22%. Fetch.ai's FET, an AI-sector token, slid from about $0.468 at 20:45 UTC to $0.113 at around 21:20 UTC: a fall of roughly 76% in about 35 minutes. Within the next quarter of an hour it had whipsawed back above $0.40, and it finished the day near $0.35.
Slower sell-offs produce the same ordering, just less theatrically. From the open of January 29, 2026 to the close of February 5 — eight daily sessions — Bitcoin lost about 30% on Binance, Solana about 37% and Ether about 39%.
Thinner order books are the first reason. Market depth on a mid-cap token can be a tiny fraction of what sits under Bitcoin. When a wave of sell orders arrives, it eats through the few bids close to the price and keeps going — which is how a 76% wick can print in minutes and vanish almost as quickly.
Leverage is the second. Perpetual futures on altcoins often carry leverage that is large relative to the coin's real liquidity. A falling price triggers liquidations, liquidations are executed as market sells, and those sells push the price into the next layer of liquidation levels.
Collateral links the damage together. Plenty of traders post altcoins as margin; when those coins drop, exchanges apply bigger haircuts or close positions, so a fall in one asset turns into forced selling in others. On top of that, holders who need cash sell whatever still has a bid, and correlations between coins that usually drift somewhat independently jump toward one — precisely when spreading money across several altcoins was supposed to help.
The practical lesson is about size rather than selection. A mid-cap token held at the same position size as Bitcoin carries noticeably more risk, because its realistic worst case is bigger and can arrive faster. Stop-losses protect less than people expect in thin books: a stop can be triggered near the top of a wick and filled near its bottom. And five different altcoins, in a real crash, behave much more like one large altcoin bet than like five independent ones.