USD/JPY has become one of the most closely watched currency pairs this summer. After the yen weakened to a four-decade low near ¥164, Japan and the United States carried out a coordinated intervention, with Tokyo reportedly spending approximately $34 billion in a single trading session to defend its currency. The intervention briefly pushed the pair toward ¥155, but the yen has since relinquished part of those gains, trading back near ¥158 as doubts persist over how long intervention alone can sustain the reversal. Japan's previous solo interventions in 2022 and early 2024 likewise produced only short-lived yen strength, underscoring the historical pattern that currency operations tend to stall rather than reverse macro-driven trends unless accompanied by a shift in monetary policy.

Interest Rate Gap and Macro Drivers

The fundamental driver behind the yen's weakness remains the wide gap between US and Japanese interest rates, exacerbated by rebounding oil prices following renewed tensions in the Strait of Hormuz. Because Japan imports nearly all of its crude oil, higher energy costs worsen the country's trade balance and add structural downward pressure on the yen. The rate differential has also fuelled carry-trade positioning, where investors borrow yen at low Japanese rates to fund purchases of higher-yielding assets elsewhere—a trade that accelerates yen selling when the gap widens and unwinds sharply when it narrows.

Markets are now watching for a possible Bank of Japan (BoJ) rate hike in September, encouraged by six consecutive months of rising real wages in Japan. Sustained wage growth is a key precondition the BoJ has cited for normalising its ultra-loose policy stance. On the US side, the Federal Reserve's own July meeting saw three dissenting policymakers push for a hike rather than a hold, keeping American monetary policy firmly in focus.

With both central banks now actively in play, USD/JPY's next directional move appears to hinge on which side acts first: Tokyo's rate decision or Washington's next data-driven signal.

Technical Analysis of USD/JPY

Following the coordinated intervention, the pair dropped sharply from highs of 163.76 to a low near 155.21 before staging a steady recovery. Price is currently testing the 0.382 Fibonacci retracement level near 158.48, supported by an ascending trendline drawn from the intervention low. The Relative Strength Index (RSI) is showing a bullish divergence, printing higher lows even as price briefly retested the range.

Bullish Scenario

Should buyers hold the ascending trendline and break decisively above the 0.382 retracement, the path would open toward the 0.5 Fibonacci level near 159.49. A stronger move could target the 0.618 retracement around 160.50, where deeper resistance likely awaits.

Bearish Scenario

Conversely, a break below the ascending trendline would invalidate the current recovery structure, exposing a retest of the intervention low in the 155.21–156.00 zone. The RSI divergence would lose credibility if price fails to hold this support area.

With price consolidating at the 0.382 Fibonacci confluence and both the trendline and RSI hinting at renewed strength, USD/JPY appears poised for a decisive move. The key question remains whether the post-intervention recovery will extend, or whether Tokyo's defence of the yen will prove temporary.