US Treasury purchased 79.4 billion yen... approximately $500 million in dollar terms (approximately 716.8 billion won)

The U.S. Treasury bought ¥79.4 billion (about $499 million) in the spot market on July 31, selling euros from the Exchange Stabilization Fund, according to a third-quarter foreign exchange report released by the Federal Reserve Bank of New York, which executed the trade as the Treasury's fiscal agent. The intervention, the details of which were disclosed on the 13th, was aimed at countering "disorderly" moves in the yen, though the report did not disclose the size of the euro sales. The dollar/yen rate of 159.16 cited in the Fed's H.10 table implies the purchase was worth roughly $498.9 million, or about 716.8 billion won. The disclosure offers a rare look at how U.S. authorities intervened to stabilize the Japanese currency, and traders will watch whether further operations follow if yen volatility persists.