Overview
- Japan spent roughly $80–$88 billion and the United States bought about $5–$10 billion of yen in a coordinated operation on July 30–31 that pushed USD/JPY down from about 164 to near 155.
- Within days much of that rally evaporated and the yen is trading around 158–159, a move traders say is testing whether Tokyo and Washington will intervene again.
- U.S. officials framed their role as stopping contagion into U.S. Treasuries, and the New York Fed executed U.S. purchases by selling euros rather than selling Treasuries while reports that Japan used the Fed’s FIMA repo facility remain disputed.
- Market strategists warn the intervention is likely a temporary fix because wide interest‑rate gaps, Japan’s large public debt and active carry‑trade flows continue to push capital offshore unless the Bank of Japan tightens policy.
- Investors will watch the Bank of Japan’s September decision, U.S. inflation and Treasury yields, and any fresh intervention signals because those moves could determine whether the yen’s slide resumes and raise import costs for Japanese households and firms.