Yen surges to 157 per dollar, sparking intervention speculation

On July 30, 2026, the Japanese yen surged by 3% to briefly reach the 157 range against the US dollar, prompting widespread speculation that Japanese authorities had intervened in the currency market. Market participants said that an intervention was the only plausible explanation for such a sharp move. The jump came amid reports that the US was conducting a rate check, and it also affected Asian stock markets, which were expected to gain as US peers rebounded. The yen's strength was a key factor in the day's trading, though a separate story about earthquake damage at a Japanese auto parts maker also emerged.