The US Dollar Index (DXY)
One number for the whole dollar
Read
The dollar trades against dozens of currencies at once, so "is the dollar strong?" gets messy fast. The DXY squashes the whole question into a single number.
Orange Put here. 📊 Instead of checking ten dollar pairs to work out the mood, check one dial. The US Dollar Index, ticker DXY, measures the dollar against a basket of six major currencies. One glance tells you which way the greenback is leaning.
What is in the basket
Six currencies — and crucially, they are not weighted equally.
Euro — by far the heaviest slice; it dominates the index. Then the yen, the pound, the Canadian dollar, the Swedish krona and the Swiss franc. Meaning: DXY is really mostly a EUR/USD story in disguise.
That is the single most useful fact about the index. Because the euro is more than half the basket, DXY and EUR/USD are close cousins moving in opposite directions — and if you are already watching EUR/USD closely, DXY will rarely surprise you.
DXY up: what usually happens
When DXY rises, the dollar is broadly strong — and a strong dollar leans on a lot of other markets at once.
EUR/USD tends to fall, being the flip side of the same trade. Gold is often pressured, because it is priced in dollars and just got dearer for everyone else. Risk assets can wobble as tighter dollar conditions drain the mood.
None of these are laws. They are tendencies that hold often enough to be worth checking, and that fail loudly enough to be worth not betting the account on.
A compass, not a trigger
Here is the discipline that keeps this useful. DXY sets the weather. It does not tell you when to enter.
Use it as macro context — a compass to check whether your idea is swimming with the dollar tide or against it. A long EUR/USD setup into a firmly rising DXY is not forbidden, but you should at least know you are rowing upstream and size accordingly.
Read the dollar's mood first, then let your actual setup make the call.
Because the euro dominates the basket, "EUR/USD is falling and DXY confirms it" is often one observation counted twice. Look for confirmation from something that is not mostly made of the euro — the yen or the pound legs, or gold.
One dial for the whole greenback. Check it before the setup, not instead of it. 🧭