The BOJ intervention playbookUSD/JPYOANDA:USDJPYEchelonEdgeAIBOJ intervention: The rules of the game every USD/JPY trader needs to know! The Bank of Japan is the only major central bank that actively intervenes in currency markets to defend specific levels. Understanding when and how they intervene is essential for anyone trading USD/JPY. Japan's economy is structurally dependent on exports. A weak yen helps exporters by making Japanese goods cheaper internationally. But yen weakness beyond a certain point becomes damaging: it raises import costs, particularly for energy, which Japan imports almost entirely. The BOJ and Ministry of Finance tolerate gradual yen weakness but intervene when weakness becomes disorderly or threatens to accelerate into a currency crisis. The signals that intervention is approaching follow a predictable pattern. First comes verbal intervention: MOF officials make statements about watching currency moves closely and being ready to act. These are warnings. Second comes the rate of move: The BOJ is less concerned with the absolute level of USD/JPY and more concerned with how fast it's moving. A gradual move to 152 is less likely to trigger intervention than a rapid move from 145 to 152 in two weeks. Third comes the level itself. Historical intervention has occurred in the 145-152 range in recent years though this is not a guaranteed trigger point. When intervention happens it is sudden and violent. USD/JPY can drop 400-600 pips in minutes. Traders caught long without stops face account-destroying losses. The practical rule: when USD/JPY has moved more than 5-7% in a short period and verbal warnings are escalating, reduce long exposure regardless of what the chart looks like. The BOJ does not care about your technical setup.