Bitcoin traded near $78,500 on Sept. 8 as the Japanese yen climbed to its strongest level since February. The move left BTC inside its recent range, but it also raised a familiar question: what happens when money borrowed in yen becomes more expensive to repay?
The yen touched 152.89 per dollar in Asian hours before easing to 154.14. That pullback gave risk assets some room, though traders were still watching the Bank of Japan’s Sept. 17-18 meeting. A 25-basis-point hike to 1.25% was priced at 97% probability, according to a Sept. 8 Tokyo Tanshi report. With a hike so widely expected, the guidance after the decision may matter more than the move itself.
Carry trades and the yen channel
Cross-border yen borrowing reached ¥360 trillion, or about $2.35 trillion, in March, based on Jefferies analysis of BIS data. A carry trade borrows in a cheap currency to buy higher-yielding assets. When the yen strengthens, the cost of repaying those liabilities rises in foreign-currency terms. Higher Japanese rates can also narrow the return.
The pressure does not stay with people who explicitly borrowed yen for crypto. Losses or margin calls in one part of a portfolio can force sales elsewhere. The BIS account of August 2024 showed how deleveraging and margin demands spread across markets, including crypto. September’s result would depend on remaining borrowed positions, margin requirements, and which assets investors decide to sell.
Bitcoin support and the futures question
Bitcoin stayed within the $77,200 to $82,100 range cited in Bitfinex’s Sept. 7 analysis. US spot Bitcoin ETFs took in $730.8 million on Sept. 3 and $174.6 million on Sept. 4, according to Farside Investors. Glassnode put the short-term-holder cost basis near $71,000 on Sept. 2, giving recent buyers a cushion while price stayed above that average.
Still, the rally leaned on derivatives. CryptoQuant contributor Carmelo Alemán noted open interest rising from $25.2 billion to $27.5 billion on Sept. 3. That can be vulnerable if prices reverse and traders cut positions before spot buyers absorb the supply. Other CryptoQuant contributors described negative spot-demand readings even as large holders kept buying. CQ Research did report spot volume three to four times early-August lows, so participation clearly increased. The balance between buying and selling remained unsettled.
What to watch next
Short-term-holder whale unrealized profits were above $9 billion on Sept. 4, a record in that metric, then fell to $7.5 billion on Sept. 5. Binance reserves sat around 685,000 to 687,000 BTC, according to XWIN Japan’s Sept. 8 note. Glassnode’s short-term-holder SOPR reading was about 1.003, close to break-even. A sustained move below 1 would suggest recent coins are being spent at a loss.
For Bitcoin, renewed yen strength would matter more if it arrived with weaker ETF demand, shrinking derivatives positions, and sustained losses for recent buyers. If buying continues and positioning adjusts in an orderly way, the market may keep absorbing more expensive Japanese funding. The evidence will come from whether buyers keep taking supply and recent holders protect gains or realize losses.
