Yen, the Shock That Stopped the Carry Trade

Yen, the Shock That Stopped the Carry Trade

Japanese intervention and a more hawkish BoJ reverse JPY crosses, while Hormuz raises the risk premium

On April 30, the currency market received a clear signal: Tokyo is no longer willing to tolerate a disorderly depreciation of the yen. After days of mounting pressure, with USD/JPY climbing above 160, Japanese authorities intervened to support the currency, triggering a sharp decline across all major yen crosses. Reuters reported that the dollar had risen as high as 160.725 yen before the intervention pushed USD/JPY down to 155.5, with the yen gaining as much as 3% during the session.

Technically, this was not a “BoJ move” in the strictest sense. In Japan, foreign exchange intervention decisions fall under the authority of the Ministry of Finance, while the Bank of Japan carries out the operations as the ministry’s agent. This distinction matters, because the BoJ acted on another front: monetary policy. On April 28, it left the overnight rate around 0.75%, but with a split 6-3 vote; three board members had proposed raising rates to 1.0%, signaling a much more restrictive shift in tone compared with previous months.

The combination of currency intervention, internal dissent within the BoJ and geopolitical risk created the conditions for a violent unwinding of carry trades. The mechanism is straightforward: when the yen is weak and Japanese rates remain below those of other economies, many investors borrow in yen to buy higher-yielding currencies. But when Tokyo threatens or carries out intervention, the covering of these positions can become rapid and aggressive.

The international backdrop amplified the move. The closure of the Strait of Hormuz and the war in Iran have brought oil back to the center of the macroeconomic stage. The EIA notes that around 20.9 million barrels per day passed through Hormuz in the first half of 2025, equal to roughly 20% of global petroleum liquids consumption. For Japan, the issue is particularly sensitive: the BoJ itself highlights that more than 90% of Japan’s annual crude oil imports come from the Middle East.

In this environment, a weak yen is no longer merely a competitive advantage for exports; it becomes a channel for imported inflation. More expensive oil, a weaker yen and higher energy costs squeeze real incomes and corporate margins. In its April Outlook, the BoJ indicated that Japan’s core CPI could fall within the 2.5%-3.0% range in fiscal year 2026, with upside risks to prices and downside risks to growth precisely because of higher energy costs and tensions in the Middle East.

In the market, the reaction was broad-based. USD/JPY was the main barometer: according to Yahoo Finance historical data, on April 30 the exchange rate opened around 160.32, touched a high of 160.72, fell as low as 155.51 and closed at 156.52. The open-to-close move was therefore around -2.4%, while the high-to-low range exceeded 3%.

The break below 158-159 changed the short-term technical picture. Until the move above 160, the trend was still dominated by the divergence between the Fed and the BoJ and by yield differentials. After the intervention, however, the market began to price in asymmetric risk: above 160, the probability of further official action increases, while below 156-155 a broader consolidation phase opens up. Initial resistance now stands in the 158.60-159.00 area and then at 160.70; key supports remain at 155.50 and, lower down, around 154.

EUR/JPY followed the same pattern, though with dynamics made more complex by European policy. The cross opened on April 30 at 187.20, reached a high of 187.55, fell to 182.26 and closed at 183.10: an open-to-close decline of around -2.2%. The drop erased in just a few hours the bullish structure built during previous sessions, bringing the exchange rate back toward the lower end of its recent range. From a technical standpoint, the 182.20-183.00 area becomes the first support to defend. A stable recovery above 185.50-186.00 would ease bearish pressure, but only a return above 187.50 would reopen the previous bullish scenario.

AUD/JPY was hit significantly because it remains one of the crosses most sensitive to global sentiment. The Aussie tends to benefit from phases of risk appetite and demand for commodities, but when the market reduces leverage and carry trade exposure, the cross against the yen can fall quickly. On April 30, AUD/JPY opened at 114.08, touched 114.44, fell to 111.30 and closed at 112.43, with an open-to-close loss of around -1.45%.

The technical picture is less compromised than that of USD/JPY, but the signal is clear: the 114.50-114.70 area rejected buyers and triggered a sharp reversal. The first support lies around 111.30-111.10; below that level, the market could revisit previous accumulation areas. On the upside, however, 113.30 and then 114.70 are the levels that need to be broken to rebuild a positive structure.

CAD/JPY showed an intermediate dynamic. The Canadian dollar is supported by rising oil prices, but the positive effect of commodities was not enough to offset the sudden strength of the yen. On April 30, the cross opened at 117.18, reached a high of 117.51, fell to 113.87 and closed at 115.17, marking an open-to-close decline of around -1.7%.

Technically, CAD/JPY remains a cross to watch closely because the 117.50 area coincides with a significant high and a potential exhaustion zone for the bullish trend. The first operational support lies between 114.40 and 113.90; holding above this range would keep the corrective move under control. Conversely, a clear break would open the door to a deeper pullback toward 112.50-111.80. On the upside, a recovery of 116.60 would be the first sign of stabilization.

Overall, the decline on April 30 should not be interpreted as a simple technical correction, but as a break in the previous market equilibrium. Until just a few days ago, the dominant theme was the structural weakness of the yen, fueled by interest-rate differentials and the BoJ’s cautious stance. Now the market must incorporate three new factors: the possibility of further official interventions, a more divided BoJ that may be closer to raising rates, and a geopolitical backdrop that makes an excessively weak exchange rate an inflationary problem for Japan.

One essential point remains: currency interventions can slow the move, but they rarely change an underlying trend on their own. To turn the yen’s rebound into a lasting reversal, markets will need more concrete signals on Japanese rates or a more stable weakening of the dollar and high-yielding currencies. In the meantime, JPY crosses are entering a new phase: less linear, more volatile and far more sensitive to every word coming out of Tokyo.