What happened
The US dollar weakened sharply after Japan launched a surprise “yentervention” to support the yen, according to the CoinDesk story. The report says the Bank of Japan (BoJ) and the Ministry of Finance carried out a coordinated intervention on March 10, 2025.
CoinDesk says the BoJ sold US Treasury holdings and bought yen directly. It also reports that USD/JPY fell below 145.00 after the move, surprising many market participants.
How the markets reacted
CoinDesk frames the dollar weakness as broad, not just yen related. It cites an early Asian move in which the Dollar Index (DXY) dropped 0.8%.
The story also lists multiple pair moves. It says EUR/USD rose to 1.0950, a three month high. It says GBP/USD broke above 1.2700, and the Australian dollar gained 0.5% versus the greenback. It further claims emerging market currencies strengthened, including a rally in the Mexican peso and South African rand.
The same source adds that USD/CHF fell to 0.8800, and the Canadian dollar “lags slightly” due to falling oil prices. It describes the session as volatile across major forex pairs.
USD/JPY technical picture
CoinDesk describes the day’s USD/JPY move as a large bearish break. It says the pair opened at 147.50 and dropped to 144.80.
The report sets nearby levels, with support at 144.00 described as a psychological threshold and resistance at 146.00 described as the pre intervention range. It also says the Relative Strength Index (RSI) dropped to 35, which it links to oversold conditions. It reports a sharp volume spike and wider Bollinger Bands, citing a vertical drop of more than 200 pips on a 15 minute chart.
Why the dollar weakened
CoinDesk points to several overlapping factors. First, it says Japan’s intervention directly sold dollars. Second, it says the Federal Reserve signaled potential caution around further rate hikes, citing Fed Chair Powell’s comments as reported in the story. That, in the story’s framing, reduces the dollar’s yield advantage.
Third, the story claims US data looked mixed, with jobless claims rising slightly and retail sales missing expectations. Fourth, it says improved risk appetite pushed investors away from the safe haven dollar, with Asian and European stock markets rallying.
CoinDesk also claims the BoJ injected over $50 billion, calling “yentervention” one of the largest single day interventions in history. The same source says the intervention coincided with a fast unwind of the speculative long dollar trade, with hedge funds and retail traders covering short yen positions, creating a feedback loop that amplified dollar weakness.
Expert reactions
CoinDesk attributes comments to currency officials and banks. It quotes Masato Kanda, described as Japan’s top currency diplomat, saying the intervention shows Japan’s commitment to yen stability and that it will take decisive action against speculative moves. It also attributes remarks to Goldman Sachs saying the US dollar weakened naturally and that Japan accelerated that process.
The story also warns, again attributing this to Goldman Sachs, that intervention alone cannot reverse long term trends. It further notes that traders were watching for whether USD/JPY would bounce or keep falling.