美国至7月30日4个月国债竞拍-得标利率 4.21%，前值4.23%。

Core Insights - The auction for the 4-month U.S. Treasury bill held on July 30 resulted in a winning yield of 4.21%, slightly down from the previous yield of 4.23% [1] Group 1 - The winning yield of 4.21% indicates a minor decrease, suggesting a potential shift in investor sentiment or market conditions [1]