A strengthening U.S. dollar is currently exerting less downward pressure on Bitcoin than many market participants anticipate, according to new correlation analysis. While the Dollar Index (DXY) has rallied significantly, data indicates that the link between the greenback and the leading cryptocurrency is weaker than the prevailing narrative suggests.

Market Context

The U.S. Dollar Index (DXY), which tracks the dollar against a basket of major currencies including the euro and the yen, has gained approximately 2.6% since Sept. 9. The index recently hit a two-month high of 101.69, signaling a broader flight to cash and a strengthening of the world's reserve currency. Typically, a stronger dollar increases the cost of dollar-denominated assets for foreign buyers and weighs on risk assets like Bitcoin and gold.

Analysis

Bitcoin's price action has indeed stalled since Sept. 21, with prices pulling back to the $83,000-$84,000 range from a recent high of nearly $87,500. While a firmer dollar may be capping the upside, the damage so far appears limited. Over the past 90 trading days, daily moves in BTC and DXY show a correlation of -0.41, the most negative reading since February 2023. However, this negative correlation implies an R-squared of 0.17, meaning the DXY accounts for only about 17% of the variation in BTC's daily returns.

Shorter-term readings are noisier and potentially misleading. The 30-day correlation stands at -0.45, but this figure leans heavily on two specific days—Aug. 19 and Sept. 3—when BTC jumped more than 5% as DXY fell. Excluding those outliers, the correlation drops to -0.19. Zooming out further, the 90-day correlation has averaged just -0.14 since January 2020 and has turned positive at times, peaking at +0.22 in November 2024. This loose link, combined with Bitcoin's low correlation to U.S. Treasury yields, supports the case for Bitcoin as a portfolio diversifier driven by independent factors.

Key Numbers

- DXY gained 2.6% since Sept. 9, hitting a two-month high of 101.69.

- Bitcoin pulled back from ~$87,500 to the $83,000-$84,000 range since Sept. 21.

- 90-day BTC/DXY correlation is -0.41, implying an R-squared of 0.17.

- 30-day correlation drops from -0.45 to -0.19 when excluding Aug. 19 and Sept. 3 outliers.

- Since Jan. 2020, average 90-day correlation is -0.14, with a peak positive reading of +0.22 in Nov. 2024.

- DXY is trading above the Ichimoku cloud but faces resistance at 101.80.

What to Watch

Traders should monitor the DXY's ability to break above the immediate resistance at 101.80, which would signal a bullish resolution to the sideways choppy trading seen since May 2025 and potentially accelerate dollar gains. For Bitcoin, the critical zone to defend remains $82,000 to $83,000, an area that previously marked a top in May before a sharp decline to ~$57,000 in June. Additionally, keep an eye on U.S. Treasury yields, as easing pressure on Treasurys after recent highs could provide a tailwind for risk assets.

Bottom Line

While the dollar's strength poses a theoretical headwind, empirical data suggests Bitcoin is decoupling from macro FX drivers, reinforcing its status as a non-correlated asset class in institutional portfolios.