Bitcoin steady near $78,500 as yen rally threatens risk assets

Bitcoin traded around $78,500 on Sept. 8, remaining inside a recent $77,200–$82,100 range as the Japanese yen strengthened to 152.89 per dollar during Asian trading before easing to about 154.14. Markets were positioned ahead of the Bank of Japan’s Sept. 17–18 policy meeting.

Cross-border borrowing in yen reached about ¥360 trillion, according to an analysis of Bank for International Settlements data. Investors who borrow yen to finance purchases of higher-yielding assets face higher repayment costs when the yen strengthens and narrower returns if Japanese rates rise. Those conditions can force portfolio adjustments, including the sale of assets purchased with yen funding.

US spot Bitcoin exchange-traded funds recorded net inflows of $730.8 million on Sept. 3 and $174.6 million on Sept. 4. On-chain data placed the short-term-holder average acquisition cost near $71,000, leaving recent buyers a buffer while prices remained above that level. The short-term-holder spent output profit ratio for coins younger than 155 days was near 1.003 on Sept. 8, indicating recently moved coins were transacting close to their purchase prices.

Derivatives activity rose in early September. Dollar-denominated open interest increased from $25.2 billion to $27.5 billion on Sept. 3, reflecting heavier futures positioning that can unwind quickly if prices reverse. Spot trading volume during the recovery was roughly three to four times early-August lows, and large-wallet activity on exchanges increased. Short-term-holder whale unrealized profits exceeded $9 billion on Sept. 4 and fell to about $7.5 billion on Sept. 5. Exchange-held Bitcoin reserves were estimated around 685,000–687,000 BTC.

On-chain and market readings used to monitor stress include a sustained short-term-holder SOPR below 1, a breach of the $71,000 short-term-holder cost basis, rising exchange reserves, and falling open interest alongside declining ETF inflows. Movements in those measures can signal shifts in selling pressure or holder behavior.

Market pricing ahead of the BOJ meeting suggested a high probability of a 25-basis-point increase to about 1.25%. Guidance on future tightening was a focus for traders, as it could affect the yen’s path and the cost of yen-funded positions. The policy announcement is scheduled for Sept. 18, with markets watching for both the rate decision and forward guidance.