The crypto market is still digesting the impact of the Federal Reserve's rate cuts, and now it faces an upcoming shock from Japan. The Bank of Japan is scheduled to hold a monetary policy meeting next week (December 18-19), and expectations for a rate hike have already exploded — prediction platform data shows a 98% probability of a 25 basis point increase, with only a 2% chance of maintaining the current stance, leaving little doubt.

Why raise interest rates? Essentially, it’s due to domestic inflation that cannot be contained. In November, the core CPI rose to 2.5% month-over-month, surpassing the central bank’s 2% target. Meanwhile, the yen/USD exchange rate hovers around 150, and continuing to keep interest rates low will only accelerate the yen’s depreciation, leading to higher import costs. Rate hikes have become an unavoidable choice.

What does this have to do with Bitcoin? At first glance, it seems unrelated, but behind the scenes lies a massive capital chain — the yen arbitrage trading system.

The mechanism is simple: when yen interest rates approach zero, investors can borrow yen at nearly no cost, convert it into USD, and enter high-yield asset markets. Bitcoin, US stocks, and other assets are common destinations for arbitrage funds. This group includes retail investors, institutional investors, and even the famous “Mrs. Watanabe” — everyone is participating. As long as the interest rate differential exists, capital flows continuously.

But once Japan raises interest rates, the game changes. Borrowing costs rise, the risk of yen appreciation reemerges, and arbitrage space is severely compressed. Investors have no choice but to accelerate the liquidation of Bitcoin and other dollar-denominated assets to repay yen-denominated debts. Historical data has long demonstrated this: since the beginning of this year, the Bank of Japan has raised rates three times, and each time Bitcoin has dropped over 20% in response.

This wave of rate hikes is already clearly visible as a risk.