DXY Reverses Sharply After Trump Postpones Iran Energy Strikes

The US Dollar Index (DXY) had one of its most volatile sessions in recent memory on Monday. It briefly broke above the psychologically important 100.00 level to a high of 100.15 on demand for safe haven assets before falling to a low of 99.12, a drop of more than 125 points in just hours.

By Tuesday, the index had partly recovered to 99.35, up 0.2%, as the initial risk-on euphoria faded and traders were faced with an unpleasant truth: the diplomatic opening that caused Monday's turnabout has not been proven and is being hotly debated.

What Moved the Dollar — and Why the Move Won't Stick Cleanly

A Truth Social post from President Trump that said the U.S. had "very good and productive" talks with Iran and that planned strikes on Iranian power plants would be put off for five days had the spark. The markets saw a hint to stop fighting. 

WTI crude fell more than 9% below $90, and Brent fell more than 13% at its lowest point. The dollar's safe-haven bid and the oil risk premium that had been supporting it both disappeared.

Right away, Tehran denied that there had been any direct talks. The Strait of Hormuz is still mostly closed to tanker traffic, meaning that about 15% of the world's oil and LNG supply can't move easily. "The overnight news at least calmed things down, but it's hard to see how this will start a risk-on trend," said Rodrigo Catril, a currency analyst at National Australia Bank.

When they said no to the $10,000, it was quick and clear. That level has been important technical resistance, and the fact that it can't be broken above even for a short time shows that the dollar's safe-haven premium is falling faster than its rate-differential support can make up for it.

The Fed Backdrop: One Cut, Sticky Inflation, and an Oil Wild Card

The direction of the dollar is still tied to the Federal Reserve's policy path. The Fed kept rates at 3.50%–3.75% at its meeting on March 18. Chair Jerome Powell said that inflation has been moving more slowly than expected. 

According to new estimates, PCE will be 2.7% for the year, and there will only be one rate cut in 2026. This is a "hawkish" environment that will keep the dollar strong against most other currencies.

It works both ways with Iran. If talks really do get better, a steady drop in the price of oil would ease the energy-related inflation pressure that has kept the Federal Reserve on hold. This could make rate cuts more likely and weaken the dollar's rate-differential argument. On the other hand, if the five-day delay ends without a solution and strikes start up again, crude prices rise above $100, fears of inflation start up again, and the dollar's safe-haven bid returns.

Chris Weston, head of research at Pepperstone, put the trader's problem very clearly: "The key question is whether participants see this as a real extension that brings a deal closer or just a delay that makes uncertainty last longer." The drop in crude oil prices and the general shift in risk have caused people to sell the US dollar. There isn't much confidence behind the move, though, and the conditions are still right for a sharp turn around.

Cross-Currency Fallout

The dollar's turn around on Monday sent shockwaves through big pairs. During the original risk-on surge, the value of the pound rose nearly 1%. By Tuesday, it had dropped 0.5% to $1.33925. After going up 0.4% on Monday, the euro fell 0.2% to $1.1593. It fell 0.2% to $0.6993 from a high point reached six weeks ago, and it fell 0.23% to $0.5845 for the New Zealand dollar.

As of February, the yen stayed mostly stable at 158.61 per dollar. However, Japan's core CPI came in at 1.6%, which was below the Bank of Japan's goal of 2% for the first time in almost four years. This made it harder for the BOJ to raise interest rates further and limited the yen's rise.

The direction of the DXY over the next week depends on one thing: whether Trump's five-day diplomatic window leads to real progress or ends without an answer. 

Between 99.12 and 99.35, the dollar is trading on geopolitical risk rather than macroeconomic factors. Until the Hormuz situation is resolved in either way, the intraday ranges will likely stay very wide and conviction will likely be hard to come by.