In a move that has sent ripples through global financial markets, the Bank of Japan (BOJ) has once again raised its policy interest rate. This increase pushes rates to levels not seen in over three decades, yet the immediate market reaction has been surprisingly counter-intuitive: the Japanese Yen (JPY) has weakened, while Bitcoin (BTC) has surged back above the $77,000 mark.
Following a two-day monetary policy meeting concluding on September 18th, the BOJ announced its decision, with a 7-2 vote, to increase the policy rate from 1% to 1.25%. This 25-basis-point hike marks a 31-year high and is the first adjustment since June. The central bank justified its tightening stance by noting the broadening pass-through of corporate costs to consumer prices, with underlying inflation nearing 2% and a continued risk of exceeding its target.
However, contrary to conventional wisdom, the Yen swiftly depreciated after the announcement. Reuters data indicates that the USD/JPY pair climbed from approximately 156 to 157.145, signifying an almost 0.8% weakening of the Yen to its lowest point since September 3rd.
Meanwhile, Bitcoin charted a divergent course. Data reveals BTC rebounded from an overnight low of around $76,200 post-BOJ decision, climbing to $77,400. On Japan’s bitFlyer exchange, BTC/JPY also rose by about 0.5% to approximately 12.06 million JPY. CoinGecko’s latest figures show Bitcoin trading at around $77,392, marking a 1.3% increase over the past 24 hours, with a market capitalization of approximately $1.55 trillion and a 24-hour trading volume of $25.6 billion.
The Yen’s Paradox: Why a Rate Hike Led to Depreciation
Superficially, higher interest rates typically enhance a currency’s appeal, theoretically strengthening the Yen. Yet, market participants weren’t solely focused on the hike itself, but rather on the BOJ’s future trajectory: would it signal an accelerated pace of tightening?
The 25-basis-point hike in September was largely priced into the market, so the 1.25% rate itself offered little surprise. What truly disappointed traders was the lack of unanimous support for the decision. The BOJ’s policy board approved the resolution with a 7-2 vote, with members Toichiro Asada and Ayano Sato advocating for maintaining rates. Reuters cited SMBC Chief FX Strategist Hirofumi Suzuki, who noted that the two dissenting votes slightly exceeded some market expectations, lending a more dovish impression to the overall resolution.
In essence, the market had anticipated not just a rate hike, but also a more hawkish forward guidance regarding future tightening. Receiving only the hike, without a stronger hawkish signal, led traders to temper their expectations for rapid BOJ tightening, resulting in a classic “buy the rumor, sell the news” scenario for the Yen.
Bitcoin’s Relief: The Yen Carry Trade Dynamics
This nuanced reaction from the Yen also sheds light on why Bitcoin did not decline following Japan’s rate increase. For decades, Japan’s ultra-low interest rates have fueled the “yen carry trade,” where global investors borrow Yen at minimal cost to invest in higher-yielding assets such such as U.S. equities, bonds, emerging markets, and even cryptocurrencies.
Consequently, the market’s primary concern wasn’t the 25-basis-point hike itself. Instead, it was the potential for a sudden, significant appreciation of the Yen or rapid BOJ tightening, which could force a massive unwinding of these carry trade positions.
The market turbulence in August 2024 serves as a potent example. A rapid Yen appreciation then triggered a global deleveraging of carry trades, leading to a sharp sell-off in both Bitcoin and equities.
However, today’s scenario played out in reverse. Following the BOJ’s rate hike, the Yen not only failed to appreciate but actually depreciated towards 157. This indicates a temporary absence of large-scale “Yen repatriation” signals from carry trade participants. For BTC, this development effectively mitigated a significant short-term tail risk.
The Enduring Carry: 1.25% Still Far Below U.S. Rates
Another crucial factor is the substantial interest rate differential that persists despite Japan’s hike to a 31-year high.
While the BOJ’s policy rate now stands at 1.25%, the U.S. Federal Reserve this week raised its federal funds rate target range to between 3.75% and 4.00%. This leaves a nominal interest rate spread of over 2.5 percentage points. Even with further BOJ hikes, the significant U.S.-Japan rate differential ensures that the Yen’s attractiveness as a low-cost funding currency for carry trades has not entirely vanished.
Therefore, the market did not follow the conventional script of “BOJ hike → Yen surge → carry trade unwinding → BTC sell-off.” Instead, the actual sequence was “BOJ hike → market perceives dovishness → Yen falls → carry trade unwinding fears subside → BTC rallies.”
Furthermore, the U.S. Treasury market provided additional relief for Bitcoin. After a week of intense selling that saw the U.S. 10-year Treasury yield briefly surpass 5% (reaching levels not seen since 2007), yields retreated to approximately 4.936% during the Asian trading session on September 18th.
This decline in yields eased some of the valuation pressure exerted by risk-free assets on equities and cryptocurrencies. Concurrently, Brent crude oil dipped by 1.5% to about $103.29, alleviating some concerns regarding Middle Eastern energy supply. Asian equity markets also rebounded, with the MSCI Asia Pacific Index rising approximately 1%, Japan’s Nikkei 225 gaining 0.8%, and South Korea’s KOSPI surging over 2%.
In essence, Bitcoin’s rebound today was not an isolated event but rather a reflection of a broader resurgence in risk appetite across global markets.
Reuters noted that despite today’s post-decision dip, the Yen has still appreciated nearly 2% month-to-date. This is attributed to market participants front-running expectations of Japan’s monetary policy normalization and capital repatriation in the weeks leading up to the rate hike, leading to a noticeable Yen rally.
BTC Above $77,000: A Temporary Reprieve, Not a Macro All-Clear
Bitcoin’s breach of the $77,000 threshold suggests the market has temporarily digested the BOJ’s rate hike. However, the broader macroeconomic environment cannot yet be characterized as accommodative.
Firstly, the U.S. Federal Reserve just completed its first rate hike since 2023, pushing its policy rate to 3.75% to 4.00%. Reuters data indicates that the futures market is now pricing in approximately a 53% chance of another 25-basis-point hike from the Fed next month, a significant jump from just 27.2% a week prior.
Secondly, Japan has not signaled the end of its tightening cycle. Analysts surveyed by Reuters currently project the BOJ’s policy rate to reach 1.5% by the end of March 2027, potentially rising to 1.75% in the second quarter. The majority of respondents anticipate a terminal rate of at least 1.75% for this cycle.
Therefore, major global central banks continue to navigate an environment characterized by elevated oil prices, resurfacing inflation risks, and sustained high bond yields. This confluence of factors does not traditionally represent a liquidity-driven tailwind for Bitcoin.
The Next Key: Governor Ueda’s Statement
As of the time of writing, BOJ Governor Kazuo Ueda has not yet held his post-meeting press conference. The Bank of Japan’s official schedule indicates the press conference is slated for 3:30 PM JST on September 18th. The current reactions of both the Yen and BTC are primarily based on the policy statement and the 7-2 vote outcome.
Should Governor Ueda emphasize upside risks to inflation and hint at another rate hike as early as December, the Yen could strengthen again, potentially reintroducing pressure on carry trades. Conversely, if he reiterates a cautious, data-dependent, and gradual approach, the market might further dial back expectations for rapid Japanese tightening.
As long as the Yen avoids a sudden, sharp appreciation and U.S. Treasury yields remain below 5%, the immediate market fear of a sudden withdrawal of global carry trade funds will likely diminish, providing Bitcoin a crucial window to solidify its position above $77,000.
Disclaimer: This article is for market information purposes only. All content and opinions are for reference only and do not constitute investment advice. They do not represent the views and positions of the author or BlockTempo. Investors should make their own decisions and transactions. The author and BlockTempo will not bear any responsibility for direct or indirect losses resulting from investor transactions.
