OneBullEx Weekly Recap 3 OneBullEx Crypto Weekly Recap: Flash Crash Tests Market Resilience as Institutions Rebalance

The week of Sept 23–29 delivered a jolt of volatility to the crypto market after months of steady gains. A mid-week flash crash erased most of the month’s progress, wiping out nearly $300 billion in market value as leveraged bets unwound . Bitcoin briefly dipped under the pivotal $110,000 level for the first time in weeks, and Ether lost its $4,000 support, though both managed to stabilize by the weekend . Despite the turbulence, crypto development marched on from major ETF fund flows reversing course to new regulatory approvals, and fresh adoption signals from mainstream companies. Below is a comprehensive recap of the week’s key price movements, news developments, and emerging trends in the global cryptocurrency landscape.

Market Overview

Bitcoin and Ethereum Pull Back from Highs

After flirting with record levels earlier in sept, Bitcoin (BTC) started Sept 23–29 $115,000 but quickly came under pressure. A wave of selling mid-week sent BTC plunging below $110,000 its largest drop since March as a cascade of over $3 billion in long positions was liquidated across futures exchanges . This “flash crash” drove Bitcoin to roughly $109Kat its lowest point, breaking a support level that hadn’t been breached since early September . By week’s end, Bitcoin clawed back some losses, hovering in the $111K–$112K range, but it still closed about 2.7% lower for the week . Market sentiment also took a hit the Bitcoin Fear & Greed Index fell into the “Fear” zone at 28, a stark shift from the optimism seen just weeks prior .

Ethereum (ETH) mirrored Bitcoin’s volatility, but with even sharper swings. ETH began the week near $4,400 and then plunged ~7% to the low $4,000s, briefly breaking below $4,000 for the first time since August . That breach of the key psychological level around $4K triggered a wave of liquidations (~$500 million) in leveraged ETH long positions , accelerating the downturn. Ethereum hit depths around $3,800 at the height of the sell-off. It managed to rebound to roughly $4,100 by Friday, but still logged its steepest weekly decline since mid-year down about 6–7% week-over-week . The ETH/BTC valuation ratio held fairly steady despite both assets’ declines , suggesting the sell-off was broad-based rather than a rotation from altcoins into Bitcoin.
 

Altcoins Retreat as Total Market Cap Dips

Altcoin markets broadly fell in Bitcoin’s wake, erasing the brief “alt-season” optimism seen earlier in the month. The total cryptocurrency market capitalization sank back below the $4 trillion milestone , ending the week down roughly 3.6% . Losses were widespread: excluding the top two assets, the altcoin market shed about 4% of value .

Major altcoins that had surged in prior weeks gave up ground. Solana (SOL), for instance, retraced from the high-$200s (it touched $240 during its recent rally) down to around $210 by week’s end amid profit-taking. Cardano (ADA)slipped under the $0.80 mark, and Polygon (MATIC) fell back toward $1 as momentum cooled. Even last week’s star performers tied to new ETFs saw modest pullbacks. XRP, which had jumped on its U.S. legal victory and ETF debut, hovered around $2.90 this week slightly off recent highs but still a strong level historically . Dogecoin (DOGE) similarly settled near $0.23, down from its mid-month spike ($0.26–$0.28) when news broke of its own ETF launch .

Still, a few outliers managed gains against the tide. Binance Coin (BNB)defied the downturn to reach a $1,000 price milestone for the first time, sparking speculation about a potential climb toward $2,000 if bullish catalysts return . In the mid-cap arena, Mantle’s MNT token jumped nearly +15% after news of deeper integration in Bybit’s ecosystem, leading altcoin gains for the week . And in a sign of the market’s ever-present appetite for new opportunities, a newly launched Layer-1 project called Plasma (XPL) focused on stablecoin applications saw its token more than double from ~$0.72 to $1.69 on the back of community airdrops and major exchange listings (Binance, Upbit) . Such exceptions aside, the dominant trend was consolidation: by the weekend, most large-cap coins were trading comfortably off their highs but above their mid-week lows, as the market attempted to form a new equilibrium heading into October.

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