USD/JPY traded above 160 multiple times across 2024 and 2025 and is back in the 158–162 zone in 2026. Each push above triggers debate about Japanese intervention. The reality is that the trigger isn't a price level — it's a rate-of-change combined with a verbal-intervention escalation pattern that traders have learned to read.
The verbal intervention ladder
- 'Watching markets closely' — ambient, not a signal.
- 'Speculative moves cannot be tolerated' — yellow flag.
- 'Will take action against excessive moves' — orange flag.
- 'Will respond with appropriate action' from the FX vice-minister — red flag, intervention window is open.
- Direct denials of intervention from the same official — historically the most reliable contrarian signal.
What the BoJ side of the equation matters for
BoJ monetary normalisation is the more durable JPY story — intervention only buys time. Each rate-hike cycle (2024, 2025, and the staggered 2026 plan) reduced the carry incentive to short JPY. The market still uses JPY as the funding leg in carry trades because the rate differential vs USD is wide; the carry is just less wide than it was in 2022–2023.
Intraday trading implications
Tokyo open (00:00 UTC), London open (07:00 UTC) and the 10:00 Tokyo fix are the highest-vol windows. A move that arrives during the Tokyo lunch break (02:30–03:30 UTC) is more likely to be a thin-liquidity overshoot than a directional break. Intervention has historically happened in the New York afternoon when Tokyo is closed — maximum surprise impact.