Last month, Khaled Balama — the United Arab Emirates' central bank governor — sat down with Treasury Secretary Scott Bessent on the sidelines of the IMF spring meetings in Washington. He raised something unusual: the idea of a currency swap line.

A swap line is essentially an emergency credit arrangement between two central banks. They agree in advance to exchange specified amounts of currency at a fixed rate, giving each side access to the other's currency in a crisis. The Fed maintains permanent swap lines with the Bank of England, the ECB, the Bank of Japan, the Bank of Canada, and the Swiss National Bank. It has never extended one to a Gulf state.

What was unusual wasn't just the request. It was the implied alternative. If Washington wouldn't backstop UAE dollar liquidity through the war's economic damage, Abu Dhabi might have to start settling oil sales in Chinese yuan instead.

Five years ago, none of that would have been imaginable. And it's not happening in isolation. Just look at what the financial press has been covering over the past few weeks:

"Iran's Hormuz yuan play: a direct hit on the petrodollar" — Asia Times

"In Strait of Hormuz, Iran and China take aim at U.S. dollar hegemony" — Al Jazeera

"The US-Israel war on Iran is accelerating de-dollarization and America's decline" — The Guardian

Those headlines describe something already underway — namely, a yuan toll booth that Iran has been running at the Strait of Hormuz since mid-March. Commercial tankers wanting to transit pay a fee — between $0.50 and $1.20 per barrel of cargo, by recent reporting — settled in Chinese yuan, routed through China's CIPS payment system. France, Japan, Malaysia, the Philippines, and Thailand — all U.S. treaty allies — are reportedly among those paying.

Read that again. U.S. treaty allies, paying Iran in Chinese currency to move oil through a strait Trump has spent the past two months trying to pry back open by force — without success.

This is what an attack on the dollar looks like in the actual world — not a BRICS press release, not a Davos panel, but in the real plumbing of how global oil trade actually settles.

And the worst part is the dollar wasn't in great shape going in.

As of the latest IMF reading, global central banks hold roughly 57% of their foreign reserves in dollars. The rest is in euros (~20%), Japanese yen (~6%), British pounds (~5%), and Chinese yuan (~3%). As impressive as that 57% sounds, it's the lowest in nearly three decades for how much central banks are keeping in dollars. Take a look at the chart below.