先说结果：周二(7月28日)，市场原本期待的加密监管法案（Clarity Act，一部旨在明确加密资产监管规则的法案）被美国参议院搁置，没有推进。同一天，HYPE、TAO、SOL这几个主流山寨币24小时内普跌5%到9%，比特币衍生品市场（合约交易市场）也出现新增空头信号——持仓量上升、资金费率下降，意味着更多人在下注跌。
这事为什么重要？往前倒一天，7月27日的市场判断里，Clarity Act还被视为能给行业带来"明朗化"的利好预期，不少资金是照着这个预期布局的。法案一搁置，这个预期直接落空。
同一天还有个巧合：韩国股市Kospi暴跌近11%，全球风险资产（股票、加密货币这类对经济和情绪敏感的资产）一起承压，比特币一度跌破6.3万美元。监管利空加上外部股市联动，两股力量叠加在了一起。
值得一提的是，OpenClue在7月28日当天同步捕捉到SOL、TAO、HYPE三个币种的立场从偏乐观转向谨慎看空。SOL此前维持了15天的偏乐观立场被打破；TAO则结束了过去两周的横盘观望，当天单日跌幅5.3%，价格创下30天新低。三个币种同一天集体转向，比只看单一币种更早发现了系统性风险的苗头。
现在市场还在等美联储的利率决议（约4.7小时后公布），恐慌贪婪指数已经跌到29（恐惧区间）。比特币现货ETF连续4天净流出，最近一日(7月28日)净流出0.5亿美元。记住一件事：监管预期落空叠加外部市场联动，才是这波山寨币普跌的核心，而不是某一个币种自身出了问题。
Here's what happened: on Tuesday (July 28), the U.S. Senate shelved the Clarity Act, a bill many in the market had been counting on to bring clearer crypto regulation. That same day, major altcoins HYPE, TAO, and SOL all dropped 5% to 9% within 24 hours. Bitcoin derivatives (futures and perpetual contracts) also showed fresh bearish signals — rising open interest paired with falling funding rates, meaning more traders were betting on further declines.
Why does this matter? Just one day earlier, on July 27, the Clarity Act was still being framed as a positive catalyst that could bring regulatory clarity to the industry. When the Senate shelved it, that expectation evaporated overnight.
Adding to the pressure, South Korea's Kospi index plunged nearly 11% the same day, dragging down risk assets broadly (stocks and crypto — assets sensitive to economic sentiment). Bitcoin briefly dipped below $63,000 as the regulatory letdown and the stock market selloff hit at the same time.
Notably, OpenClue's research tracking flagged all three altcoins — SOL, TAO, and HYPE — shifting from cautiously bullish or neutral to cautiously bearish or bearish on the very same day. SOL broke a 15-day run of relatively optimistic positioning, while TAO ended two weeks of sideways trading with a single-day 5.3% drop, hitting a 30-day low. Catching all three moving together, rather than watching one coin at a time, pointed to a broader risk-off shift underway.
Markets are now waiting on the Fed's rate decision, due in roughly 4.7 hours. The Fear & Greed Index has slid to 29 (Fear), and Bitcoin spot ETFs have posted four straight days of net outflows, including $50 million out on July 28 alone. One takeaway: this altcoin selloff was driven by a regulatory letdown colliding with external market stress — not by problems specific to any single coin.