TLDR:Binance altcoins below their 200-dma fell from 81% to under 10% between late August and early October.More than $814 billion flowed into altcoins during the two-month rally that lifted breadth above 90%.Now 48.4% of Binance altcoins sit below their 200-dma, leaving breadth near 52% after the reversal.Over 15 days, more than $134 billion left altcoins, with quick profit-taking cited as the likely driver. Altseason is losing momentum as altcoin breadth falls from above 90% to roughly 52%. Between late August and early October, altcoins went through a brief period of strength. Since then, the trend has weakened across the market. Data from Darkfost, an on-chain analyst, shows that 48.4% of Binance altcoins now trade below their 200-day moving average. Capital has also started leaving the sector, and the outflow is likely driven largely by quick profit-taking.Altseason Peak Measured by Altcoin BreadthThe share of altcoins trading above their 200-day moving average is a key indicator of favorable periods. This technical level helps separate confirmed uptrends from weak price action. Darkfost used it to track the recent altseason on Binance.From late August to early October, the share of Binance altcoins below their 200-dma fell sharply. It dropped from 81% to under 10%. As a result, nine out of ten listed altcoins had entered a confirmed uptrend. Breadth therefore stood above 90% at the peak.The Altseason Is cooling fast as Altcoin breadth drops from over 90% to around 52%Between late August and early October, altcoins went through a brief altseason, which is now starting to fade.To measure these favorable periods, the number of altcoins trading above their… pic.twitter.com/Er6yvb4evn— Darkfost (@Darkfost_Coc) October 18, 2026That move came with heavy capital inflows. More than $814 billion entered altcoins as a whole over the same period. Together, the breadth reading and the inflow data describe the strength of that phase.Altseason Momentum Fades as Outflows BeginMomentum has faded since the peak. Currently, 48.4% of Binance altcoins have fallen back below their 200-dma. Consequently, the trend has reversed for nearly one altcoin out of two on the platform. Breadth now sits at around 52%.Capital flows have changed direction as well. Over the last 15 days, more than $134 billion has left altcoins. According to Darkfost, the outflow is likely driven in large part by quick profit-taking. This marks a clear shift from the inflows seen earlier in the period.Altcoins remain a sector where dynamics change very quickly. Investor sentiment also shifts fast in both directions. As a result, the altseason that built over two months has cooled in a short time.Analyst Watch for a BreakoutMarket participants are still watching the charts. Ece Vortex posted on X that altcoins have spent months under pressure. The post adds that the chart now shows early signs of a breakout. It also drew attention to the current chart structure.Altseason cooking?Altcoins have spent months getting humbledNow the chart is showing signs of a breakoutIf resistance flips into support, things could get interesting real quick imoPatience gonna pays off soon famsChasing pumps pays someone else pic.twitter.com/yzw8cwdtmX— Ece Vortex (@EceVortex) October 18, 2026According to the tweet, the setup depends on resistance flipping into support. If that happens, conditions could become interesting quickly. The author also advised patience and warned that chasing pumps benefits other traders.Darkfost also pointed to a historical pattern. Building an appropriate exposure becomes worthwhile when interest in altcoins and their performance are at their lowest. The analyst therefore treats low-attention phases as the moment to consider an allocation.The post Altseason Weakens: Nearly Half of Binance Altcoins Fall Below 200-Day Average appeared first on Blockonomi.