Japan's Rate Turn: Why Crypto Markets Watch the Yen

Summary: The Bank of Japan held its policy rate at 1.00% on 31 July 2026, following a June increase. The yen fell to a 40-year low before partially recovering after a joint Japan–US intervention. Crypto markets track this because the yen is one of the world's major funding currencies — and in August 2024, a similar turn triggered a global selloff.

The Bank of Japan held its policy rate at 1.00% at the 31 July meeting. The vote was 8-1, with board member Hajime Takata proposing 1.25%; the majority rejected the proposal. Source: CNBC, 31 July 2026 · FXStreet, 30–31 July 2026.

The rate had been raised to 1.00% in June. Source: MEXC market summary, 28 July 2026.

In the same week, on 30 July, the Japanese government lowered its growth forecast for fiscal 2026 from 1.3% to 0.9%, citing higher crude oil prices driven by Middle East tensions. Source: Cabinet Office, 30 July 2026 · Japan Times, Bloomberg, 30 July 2026.

The revised projections assume the yen at 161.4 per dollar and crude at $92.5 per barrel, against January assumptions of 155.2 and $68 respectively. Source: Cabinet Office mid-year outlook, 30 July 2026, per Kyodo News.

USD/JPY approached 164 — a 40-year low for the yen.

On the night of 30 July, Japanese authorities intervened in the market, reportedly in conjunction with the United States. The pair fell below 158.

The effect did not hold: once the intervention faded, the pair settled back near 160.6. Source: Babypips market analysis, 31 July 2026 · CNBC, 31 July 2026.

These two are often conflated.

Actual Japanese core inflation in July was 1.6% — below the central bank's 2% target, and below target for most of 2026. Source: CNBC, 31 July 2026.

The BOJ's forecast, by contrast, sees core inflation accelerating clearly above 2% from the second half of fiscal 2026 (September to March). It cites three drivers: wage increases passing into selling prices, higher crude oil prices, and yen depreciation. Source: BOJ Outlook Report, 31 July 2026, per CNBC summary.

In other words: Japanese inflation is not currently high. The central bank expects it to become so.

The yen has functioned for decades as a funding currency: investors borrow in yen at low rates, convert to other currencies, and hold higher-yielding assets. As long as Japanese rates stay below others, the differential produces a return.

That structure breaks when the yen strengthens sharply or Japanese rates rise. Yen loans must then be repaid, which requires selling the assets held in other currencies — including equities, bonds and crypto assets.

Market observers therefore track BOJ decisions closely: a Japanese rate rise, a sudden yen appreciation, or higher Japanese government bond yields can force leveraged investors to reduce global positions. Source: MEXC market summary, 28 July 2026.

This is not a theoretical risk. In August 2024, a similar unwind triggered a global selloff.

As a market forecast, Goldman Sachs revised its twelve-month USD/JPY view from 155 to 165 on 6 July 2026. Source: Investing.com, 6 July 2026.

This article is informational and educational. It contains no investment advice, no trading recommendation, and does not call for any position to be opened or closed.

The figures above come from the sources cited, at the dates cited. Market prices and central bank decisions may have changed since.

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