In practice
The index gives a single reading of whether the dollar is strengthening or weakening overall. Since most major markets are priced in dollars, traders use it as background for trades in forex, gold and often stocks and crypto.
A long EUR/USD idea is more convincing when the dollar index is falling from resistance at the same time.
What to watch for
The basket is dominated by the euro, which makes up more than half of it, so the index is partly a mirror of EUR/USD. The usual relationships with gold or stocks break down often enough that it should confirm a trade, not create one.
Related terms
3 terms- ForexTrading one currency against another, quoted in pairs like EUR/USD.
- SMT divergenceCorrelated markets disagreeing at a key level, for example NQ making a lower low while ES doesn't.
- Interest rateThe price of money set by central banks; higher rates usually lift the currency and weigh on stocks and gold.