Sri Lanka had been cutting rates for years, and that just stopped.
The central bank hiked rates a full percentage point on Tuesday - its biggest move in four years - after the rupee crashed to a three-year low last week as the Iran war pushed energy prices up.
The Central Bank of Sri Lanka lifted the Overnight Policy Rate to 8.75% from 7.75% on Tuesday, with Governor Nandalal Weerasinghe saying the bank wanted to use a "clean instrument" rather than reach for other tools first.
The trigger was demand-driven inflation, where borrowing rates too low for too long pulled imports higher, sucked dollars out of the country, and pushed the rupee down to 354 per dollar on Thursday - a three-year low.
The bank also stepped into the foreign exchange market to add dollar liquidity, and the rupee recovered to 324-325.50 by Tuesday's close.
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This is what war-driven inflation looks like in a smaller economy, where higher energy costs are pulling dollars out, weakening the currency, and forcing the central bank to choose between propping up the currency or supporting growth.
Sri Lanka picked the currency, which is the right call when the trauma from the 2022 default is still fresh.
Bond yields jumped across all maturities on Tuesday, with the three-month T-bill rising 18 basis points to 8.36% and the 12-month yield climbing 34 basis points to 8.83% as investors took the bank at its word.
For broader exposure to the region, emerging market ETFs have been moving in lockstep with central bank pivots like this one.
The bank says it will use more tools if the rate hike isn't enough, with Weerasinghe pushing back hard against critics who accused the bank of money-printing - calling the question "stupid" at the post-decision briefing per EconomyNext.
The next test is whether the rupee can hold, and if energy prices stay elevated and the war stretches longer, one hike won't be the last.
Sri Lanka rebuilt its credibility after the 2022 crisis, and the central bank is now spending some of it to defend the rupee.
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