Yen Watch: Did Washington Help Tokyo Intervene on July 31?

July 31 dollar-yen intraday path from about 158.9 to 157.6, marking a reported notepad plan, a reported bank notice, and the LSEG move; no official intervention confirmation at cutoff.

A Treasury Secretary’s notepad showing a $5-10 billion yen purchase plan, a reported Treasury bank notification, and a late-afternoon yen jump on July 31, 2026, point to possible U.S.-Japan intervention. This note is reported and developing, not confirmed. Official Japanese MOF transaction data, published with lag, is the upgrade trigger.