据美国纽约联储数据，上个交易日（7月31日）担保隔夜融资利率（SOFR）报4.39%，之前一天报4.32%。上个交易日有效的联邦基金利率报4.33%，之前一天报4.33%。

Group 1 - The secured overnight financing rate (SOFR) was reported at 4.39% on July 31, up from 4.32% the previous day [1] - The effective federal funds rate remained unchanged at 4.33% on the same day, consistent with the previous day's rate [1]