DXY and bitcoin correlation: how the dollar index moves BTC

The DXY bitcoin correlation is mostly negative: when the US dollar strengthens against other major currencies, bitcoin, which is priced in dollars, usually weakens, and vice versa. But the link is weaker and less reliable than headlines suggest. On our own calculation using daily data since 2017, the correlation between daily returns of bitcoin and the Fed's broad dollar index is about −0.15, and the rolling 90-day correlation was below zero only 82% of the time. This guide explains what the dollar index is, how it connects to bitcoin through rates and liquidity, what nine years of data show, and how to read DXY alongside our market dashboard.

What the US Dollar Index (DXY) measures

DXY, formally the U.S. Dollar Index or USDX, tracks the dollar against a basket of six currencies. It is calculated and published by ICE Data Indices every second, using mid-points between bid and offer. The index launched in March 1973 with a base of 100, so a reading of 101.84 means the dollar is 1.84% stronger against the basket than it was in 1973.

The basket weights are fixed, per ICE:

The composition has changed once, in January 1999, when the euro replaced several European currencies. That is DXY's defining quirk: more than half the index is simply EUR/USD. The Chinese yuan, Mexican peso and Korean won are absent despite being major US trading partners. The all-time high was 164.72 in February 1985 and the low 70.698 in March 2008, both per ICE.

A free alternative is the Federal Reserve's Nominal Broad U.S. Dollar Index. It covers the currencies of 26 economies, weights them by bilateral trade with the US, updates the weights annually, and publishes daily values openly through FRED. We use that series for the calculations below, because DXY data belongs to ICE and is not freely available.

Why a strong dollar weighs on bitcoin: three channels

1. The denominator. Bitcoin trades mainly against dollars and dollar stablecoins. If the dollar rises against every currency, the dollar price of BTC falls all else equal, just as it does for gold or oil. For a holder in euros or yen the drop may be smaller or absent.
2. Rates and liquidity. The dollar tends to rise when the Fed tightens or when US Treasury yields exceed those of other countries. Higher risk-free dollar yields make any asset without a coupon, bitcoin included, relatively less attractive. We cover the mechanics in our piece on Fed rates and bitcoin.
3. Safe-haven demand. In stress episodes, investors worldwide buy dollars and Treasuries and sell risk. Bitcoin behaves like a tech stock in those weeks, not like a haven, so a rising DXY and a falling BTC are a common pairing on panic days.

The reverse also happens: the dollar weakens because the Fed eases, global liquidity expands, and bitcoin benefits through both channels, as a dollar-denominated asset and as a beneficiary of cheap money. That was the 2020 story.

What the record shows: 2018⁠–⁠2026

We compared the yearly change in the Fed's broad dollar index with bitcoin's Binance daily closes, from the first to the last trading day of each year:

In six of nine years the two moved in opposite directions, as the rule of thumb predicts. But in 2021 and 2024 both finished higher, and in 2025 both finished lower. The dollar's annual direction does not explain bitcoin on its own: in 2024 the halving and the launch of spot ETFs outweighed an expensive dollar.

The clearest example of the inverse link is 2022. The Fed index peaked for the year at 128.45 on September 26, 2022, and DXY, per ICE, closed at a 20-year high of 114.24 on September 27. Bitcoin traded near $19,100 that day and, after the FTX collapse, hit its yearly low of $15,781 on November 21, 2022 by Binance daily close. Tellingly, the relationship broke in the FTX weeks: CoinDesk noted that the BTC–DXY correlation turned positive between November 9 and 27 and reached 0.84 on November 19. A crisis inside crypto mattered more than the dollar.

How tight is the link? The correlation in numbers

Correlation runs from −1 (always opposite) to +1 (always together). Our results on daily FRED and Binance data from August 2017 to October 9, 2026:

• correlation of daily returns over the full period: −0.15;
• correlation of monthly returns: −0.16;
• the rolling 90-day correlation was below zero 82% of the time: 100% of the time in 2021, 2022 and 2026, but only 37% in 2018;
• the most negative 90-day reading was −0.66 on March 12, 2020, at the height of the COVID panic; the most positive was +0.17 in November 2024, when the dollar and bitcoin rallied together after the US election.

In other words, the sign is persistent, the strength is not. Market estimates agree. TradingView data cited by Spazio Crypto and CoinCub put the 30-day BTC–DXY correlation at −0.90 on April 24, 2026, the most negative since September 2022. Yet only six weeks earlier, in early March 2026, 24/7 Wall St. reported, citing JPMorgan analysis, that the correlation had briefly flipped positive: on March 3 DXY reached 99.4, a three-month high, while bitcoin held above $68,000 on more than $1.5 billion of weekly ETF inflows. A 30-day window can swing from −0.9 to positive in a matter of weeks, so it is no basis for long-term conclusions.

What it looks like on October 17, 2026

From our dashboard as of 2:00 PM ET on October 17, 2026:

• DXY at 101.84, down 0.16% on the day and 0.36% over five days. Per FXStreet, the index touched 102.50 on October 5, an 18-month high, after climbing from a low near 98.60 on September 9; the 10-year Treasury yield reached 5.35% on October 7, its highest since April 2002.
• Bitcoin at $81,383 on Binance spot, down 1.9% over seven days and up 6.5% over 30 days. We covered the October 7 low in our note on the drop to $82,700.
• The 10-year Treasury yield at 5.09% and the 2-year at 4.74% as of October 16; oil at $101.41, up 10.4% in five days; gold at $4,181.
• The Fed's broad dollar index at 121.60 on October 9, after a 2026 high of 121.79 on October 1. Bitcoin was down 8% year-to-date as of October 9, with its 2026 low of $58,625 on June 30.
• The 90-day correlation between bitcoin and Fed-index returns was −0.38 on October 9, and the 30-day reading −0.23. The window has tightened all year, from −0.06 in late January to −0.38 in August through October.

Autumn 2026 is a textbook strong-dollar setup: yields at two-decade highs, oil above $100, and a Fed that raised rates to 3.75⁠–⁠4.00% in September. Polymarket odds in our dashboard on October 17 put the probability of a hold at the October 27⁠–⁠28 meeting at 86.5% and of a December hike at 76.5%. If those expectations shift, the dollar will react first and bitcoin will follow. Live figures are always on the Bitcoin page.

How to use DXY in practice

1. Watch the direction, not the level. What matters for bitcoin is whether the dollar has been climbing for weeks, not whether DXY reads 100 or 105.
2. Ask why the dollar is rising. Fed rates above expectations, a flight from risk, or euro weakness are three different scenarios with different effects on BTC. A fall in EUR/USD caused by European problems lifts DXY almost mechanically and may leave bitcoin unmoved.
3. Cross-check with yields. DXY rising together with the 2-year Treasury yield signals a repricing of rate expectations, the most painful scenario for bitcoin.
4. Check crypto-native indicators. Spot ETF flows, stablecoin supply and cycle metrics such as MVRV show whether there is internal demand strong enough to override the macro backdrop, as in 2024.
5. Do not trade the correlation. A −0.9 reading in a 30-day window says nothing about the next 30 days: in 2026 it changed sign twice within a quarter.

Limitations

• DXY is mostly the euro. EUR/USD carries 57.6% of the basket, so the index reflects the dollar–euro relationship more than the dollar's standing in world trade. The Fed's 26-currency index is more representative but lags and has no intraday data.
• Correlation is not causation. The dollar and bitcoin often react to the same event: a Fed decision, an inflation print, geopolitics. Bitcoin falling after DXY rises does not prove the dollar caused it.
• The strength is unstable. In 2018 the 90-day correlation was negative only a third of the time; in 2022, all of the time. Any claim that "the dollar explains X% of bitcoin" depends on the period chosen.
• Crypto-specific shocks dominate. The FTX collapse in November 2022, the ETF launch in January 2024 and the liquidation cascade of October 2025 moved price independently of the dollar.
• Data sources differ. ICE's DXY, the DX futures on ICE Futures and the Fed index give different values, and daily closes vary by a few tenths of a point across providers. Compare series from a single source.

FAQ

Does bitcoin always fall when DXY rises? No. It falls more often than not, but in 2021 and 2024 both rose, and since 2017 the 90-day correlation has been negative 82% of the time, not all of it.

What is the current correlation between bitcoin and the dollar? On our calculation as of October 9, 2026, the 90-day correlation of daily returns between BTC and the Fed's broad dollar index is −0.38, and the 30-day reading is −0.23. Current macro data is in the dashboard.

How is DXY different from the Fed's dollar index? DXY has six currencies with weights fixed since 1999, more than half of it euro, computed by ICE in real time. The Fed index covers 26 currencies, updates trade weights annually, and is published daily for free.

Where can I follow DXY for free? The current value with one-day and five-day changes is in our market dashboard. The Fed index history is on FRED under series DTWEXBGS. Market expectations for DXY's month-end level trade on Polymarket.

This is not investment advice.