Emerging-market carry trades shrug off US-Japan yen intervention, and that tells us something important

When the US and Japan teamed up to buy yen in early August, the financial world braced for impact. The last time these two coordinated a currency intervention was 1998, back when the Asian financial crisis was redrawing the map of global finance.

The Bloomberg EM FX Carry Risk Premia Index dropped roughly 1% in the aftermath. For context, the August 2024 yen rally triggered a 4% decline in the same index.

What actually happened

The coordinated intervention landed on or around August 1, with official confirmation from the US Treasury and Japan’s Finance Ministry arriving on August 3-4. US Treasury Secretary Scott Bessent and Japan’s Finance Minister Satsuki Katayama framed the move as necessary to maintain global stability amid rising exchange rate volatility.

President Trump also weighed in publicly, positioning the intervention as a critical stabilization effort.

In a carry trade, investors borrow in a low-yielding currency and park the money in higher-yielding assets elsewhere. In English: you take out a cheap loan in yen and use it to buy, say, Brazilian or South African bonds that pay you a much fatter interest rate. The spread between the two is your profit, assuming the funding currency doesn’t spike in value and eat your returns.

That’s exactly what happened in August 2024, when a sharp yen rally forced a messy unwind of carry positions. Traders who had loaded up on yen-funded bets got squeezed hard, dumping emerging-market assets in a scramble for the exits.

Why the playbook changed

Instead of relying overwhelmingly on yen borrowing, carry traders have increasingly shifted to the euro and Swiss franc as funding currencies. Both offer low borrowing costs while spreading the risk across multiple currency pairs. If the yen spikes, traders funded in euros and francs don’t face the same forced liquidation pressure.

This diversification effectively severed the direct transmission mechanism between yen intervention and EM asset prices. When the Bank of Japan and US Treasury stepped in to buy yen, the appreciation pressure hit a smaller slice of the overall carry trade universe. The result was a contained, manageable pullback rather than a cascading liquidation event.

What this means for investors

The intervention itself sets a precedent. The fact that the US and Japan coordinated for the first time in nearly three decades signals that policymakers on both sides of the Pacific are willing to act decisively against disorderly FX moves.

The 2024 episode coincided with notable drawdowns across digital assets as leveraged players de-risked across the board. A more resilient carry trade ecosystem means one fewer source of systemic contagion for crypto portfolios.

The shift from yen-dominated to multi-currency funding also has implications for stablecoin markets and DeFi yield strategies. Many institutional players who participate in traditional carry trades also allocate to on-chain yield opportunities. When traditional carry trades blow up, on-chain positions get cut too.

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