The U.S. Dollar Index opened the week hugging a tight band, firm enough to keep buyers in control yet too hesitant to force a real breakout. In the latest session the gauge changed hands near 100.96, a shade above the previous close of 100.75, leaving it roughly 0.21% higher and still perched above the levels traders treat as the line between strength and slippage.
The DXY tracks the value of the U.S. Dollar against a basket of six major world currencies. Through the early European hours on Monday it barely budged, as the market kept weighing the fast-moving situation around Iran before committing to a fresh direction.
Iran keeps traders on edge
Geopolitics is doing the heavy lifting behind the dollar's mood right now. The U.S. military said on Monday it had wrapped up a ninth straight night of strikes on Iran, hitting command centres, air defence sites, maritime assets, missile facilities and communications networks. In stretches of tension like this, investors tend to reach for the dollar as a haven, which helps explain why dips are being bought rather than sold.
The chart picture
On the daily chart the tone leans mildly constructive. Price is holding above the 100-day simple moving average (SMA) and the lower Bollinger Band, a sign that shallow pullbacks are still drawing demand underneath. On the bigger frame the index remains in a long-term uptrend. Even so, the push higher looks capped: the latest Relative Strength Index (RSI) reading sits near 55, pointing to only marginal bullish pressure after the recent consolidation, while the MACD at 0.21 is trailing its signal line at 0.31, hinting at a slight loss of momentum.
To the upside, the first meaningful barrier lies around 101.05, where the Bollinger middle band and the 20-day SMA converge. Beyond that, the next wall stands near 101.60 at the upper Bollinger Band. Over the past 52 weeks the index has swung between 95.55 and 101.80, so that 101.80 ceiling remains a marker worth watching.
On the downside, immediate support shows up around 100.50 at the lower Bollinger Band, ahead of the 100.00 psychological mark. The sturdiest structural floor sits at the 100-day SMA near 99.60. A break there would chip away at the current bullish bias and open the door to a deeper slide.
What underpins the dollar
The U.S. Dollar is the official currency of the United States and circulates alongside local notes in a number of other countries too. It is the most heavily traded currency on earth. Going by 2022 data, it accounts for more than 88% of all global foreign exchange turnover, the equivalent of about $6.6 trillion in transactions every day.
After the Second World War the dollar displaced the British Pound as the world's reserve currency. For most of its history it was backed by Gold, until the 1971 Bretton Woods Agreement did away with the Gold Standard.
Why the Fed sets the tone
The single biggest factor shaping the dollar's value is monetary policy, which the Federal Reserve (Fed) steers. The Fed carries two mandates: keeping prices stable, meaning inflation under control, and fostering full employment. Its main lever for both is the interest rate. When prices climb too fast and inflation runs above the Fed's 2% target, it raises rates, and that supports the dollar. When inflation slips below 2% or unemployment runs too high, the Fed may cut rates, which weighs on the greenback.
In extreme conditions the Fed can also print more dollars and roll out quantitative easing (QE), the process by which it sharply boosts the flow of credit through a seized-up financial system. It is a non-standard measure, reached for only when banks stop lending to each other out of fear of default and simply cutting rates will not do the job. It was the Fed's tool of choice to fight the credit crunch during the 2008 Great Financial Crisis. In practice the Fed prints dollars and uses them to buy government bonds, mostly from financial institutions, and the move usually leaves the dollar weaker.
Quantitative tightening (QT) runs the other way: the Fed stops buying bonds and lets the proceeds from maturing holdings roll off rather than reinvesting them. That process tends to be positive for the dollar.
The wider market backdrop
There was movement across the broader market too. Ethereum outshone its large-cap peers over the past week, posting double-digit gains and leaving Bitcoin, XRP and Solana behind, before the whole market turned lower on Thursday. Beneath the surface, though, ETH's advance still looks fragile.
Cardano, meanwhile, stalled at $0.165 after a modest rebound. Saturday's activation of the Van Rossem hard fork marked Cardano's first protocol upgrade approved entirely through onchain governance, ushering in Protocol Version 11, whose changes are aimed at cutting smart contract costs.
On inflation, the numbers landed hot as a talking point. The June CPI dropped 0.4% on the month, the largest one-month fall since April 2020, pulling the annual rate down to 3.5% from May's 4.2% and snapping a three-month run of acceleration. Core prices went nowhere on the month and eased to 2.6% year over year, with both figures coming in below consensus. That softer inflation read will help shape expectations for the Fed's rate path, and that in turn feeds straight back into how the dollar trades.
