USD/JPY Nears 160 as Yen Weakens Past Intervention Line

The Japanese Yen weakened for a second straight session Tuesday, with USD/JPY climbing past 159.30 to draw within striking distance of 160, a level traders and officials have treated as a political line for currency intervention. Volatility stayed low as markets await Wednesday’s U.S. inflation data and Fed Chair Kevin Warsh’s Friday speech at Jackson Hole, both likely to shape the dollar’s next move.

Intervention Fears Fade as Yen Retests Highs

The pair’s approach to 160 comes despite a coordinated U.S.-Japan intervention earlier this month that briefly pushed USD/JPY down to 155 after it had threatened to break through 165. That defense has since lost its grip: the pair reversed back above 159 within days, suggesting markets are actively testing where Japanese and U.S. authorities will step in again.

State Street’s Rodrigo Loo has called 160 a political line in the sand, warning that another rapid or disorderly move through the threshold could draw officials back into the market. He added that intervention can buy time, but the real work of stabilizing the yen falls to Bank of Japan policy normalization, with a rate hike possible as early as September.

That expectation is gaining traction. Markets are now pricing an 82% probability of a September BOJ rate increase, up sharply from roughly 23% before the central bank’s July meeting, with the expected move lifting the policy rate to 1.25% from 1%. Even with that shift priced in, the wide gap between BOJ rates and those of other major central banks continues to weigh on the yen, compounded by ongoing concerns over Japan’s fiscal position.

What’s Driving the Dollar This Week

Trading volumes remain thin as investors position around two catalysts:

• U.S. PCE inflation data, due Wednesday, the Fed’s preferred inflation gauge
• Warsh’s Jackson Hole address on Friday, his first as chair, where markets will watch for his read on the Treasury’s bond buyback program and his commitment to containing above-target inflation

USD/JPY trades at 159.32, having posted a pattern of higher lows and higher highs since bottoming near 155.20 in early August. On the four-hour chart, the Relative Strength Index sits near 58 and the MACD histogram shows widening green bars, both consistent with buyers still in control.

Initial resistance sits between the August 18 high of 159.75 and the 160.00 level itself, a threshold Westpac expects the pair to hold near rather than push decisively through toward its earlier peak of 165. Above that, the July 31 high near 160.90 comes into view. On the downside, support levels sit at the June 19 low of 158.10, the August 7 low near 156.70, and the post-intervention low of 155.23.

Conclusion

USD/JPY’s climb toward 160 reflects a market testing the credibility of Japan’s intervention threshold rather than a clean breakout. With a September BOJ hike now the base case and Warsh’s Jackson Hole remarks still ahead, the pair’s next move depends less on technicals than on whether U.S. and Japanese policymakers reinforce or abandon that line.