BOJ September Rate Hike: What Happens to BTC, ETH and XRP if the Yen Strengthens?

• BOJ’s September rate hike could pressure crypto if the yen rises sharply. 
• Bitcoin faces the biggest risk from leverage unwinds tied to the yen carry trade. 
• ETH and XRP may follow broader market sentiment if risk-off conditions emerge.

The Bank of Japan (BOJ) will hold its policy meeting September 17–18, 2026, and most economists now expect a rate hike. A Reuters poll shows 57% expect rates to rise to 1.25%, up from just 5% in July. High inflation and a weak yen are putting pressure on the BOJ to raise rates sooner.

This could also affect crypto. Bitcoin (BTC), Ethereum (ETH), and XRP have reacted sharply to BOJ decisions in the past. Here’s why it matters and what could happen this time.

The Yen Carry Trade, Explained

For years, Japan kept interest rates near zero. This let investors borrow yen cheaply and use that money to buy higher-yielding assets elsewhere, including US stocks, bonds, and crypto. This strategy is called the “yen carry trade.”

When the BOJ raises rates, yen borrowing gets more expensive. If the yen also strengthens, those loans cost even more to repay in other currencies. Investors then have to sell their assets to cover the cost. This forced selling is called an “unwind,” and it can hit multiple markets at once, not just crypto.

This isn’t theoretical. In August 2024, a surprise BOJ rate hike sent Bitcoin from around $64,000 to $49,000 in 48 hours. It wasn’t bad crypto news that caused it. It was leveraged yen positions unwinding all at once.

How This Could Hit Bitcoin

Bitcoin is the most exposed because it is widely used in leveraged trading. The biggest risk is a sudden rise in the yen.

A gradual rise in the yen, along with a weaker dollar, may actually help Bitcoin by improving global liquidity. But a sharp move in USD/JPY triggers margin calls, forcing traders to sell and reduce their borrowed positions.

Because markets already expect a September rate hike, Bitcoin may rise if the BOJ does exactly what investors expect. The bigger risk is if the BOJ hints at more rate hikes after September. That will surprise traders and cause a bigger sell-off.

Ethereum’s Bigger Swing

Ethereum often moves more than Bitcoin when the yen stresses markets. In past yen-related sell-offs, ETH has dropped faster and further because altcoins tend to have more leverage and less liquidity.

But ETH can also recover faster when markets calm down. If the BOJ raises rates without causing panic, Ethereum will rebound alongside Bitcoin or even move ahead of it as traders become more willing to take risks again.

XRP and Risk Appetite

XRP is less directly affected by carry trade leverage than Bitcoin and Ethereum because it is used less often as trading collateral.

Still, XRP usually follows the overall crypto market mood. When fear causes Bitcoin and Ethereum to fall, XRP often falls too, and sometimes drops more. When markets calm down, XRP usually recovers with the rest of the market.

What to Watch Going Into September

The direction of USD/JPY matters more than the rate decision itself. A slow decline toward levels like 149, which Bank of America has flagged as possible by year-end, would support risk assets. A fast drop is what tends to trigger crypto sell-offs, since it forces sudden repositioning.

Also worth watching is whether the BOJ hints at further hikes beyond September. A more aggressive tightening path would increase pressure on the carry trade over time, even if the September move itself is calm.

Bottom Line

A BOJ rate hike does not automatically mean a crypto crash. Markets already expect the hike, so the bigger issue is how quickly the yen moves. For crypto traders, USD/JPY may be more important than the BOJ’s rate decision itself around the September 17–18 meeting.

Related: Could Japan’s Rising Bond Yields Trigger Bitcoin’s Next Sell-Off?