Definition. U.S. Dollar Index (DXY) is the value of the U.S. dollar measured against a basket of major foreign currencies, mainly the euro, yen, pound, Canadian dollar, Swedish krona, and Swiss franc, published as OHLC data.

Technical. On non-trading periods (weekends, market holidays, and outside market hours for intraday resolutions), OHLC values are forward-filled from the last trading session's close price. Daily resolution has data since January 2009. Intraday resolutions (10m, 1h) have shorter history.

Interpretation. A rising index reflects dollar strength against the basket. A falling index reflects dollar weakness.