Japan's three-day yen intervention lifted the currency in summer.
Context
What happened: Japan confirmed it intervened in the currency market on three days over the summer to prop up the yen, including its first coordinated operation with the U.S. in nearly three decades.
Key numbers: ¥7.98 trillion ($50.4 billion) bought on July 30, plus ¥5.55 trillion and ¥1.87 trillion in the following days, for a total of ¥15.4 trillion. The July 31 operation was the first joint Japan-U.S.
Why it matters: The data showed three days of intervention rather than the two traders had expected, and the total marked Japan's largest monthly spending on yen-buying intervention.