BOK: dollar stablecoins can weaken won
Bank of Korea study finds dollar-backed stablecoin demand can push the won and other local currencies lower, even without a crisis.
The Bank of Korea has published a study finding that demand for dollar-backed stablecoins can push local currencies lower, even when no crisis is underway. The mechanism is ordinary capital flight dressed up in new plumbing: savers swap won, or any non-dollar currency, for tokens pegged to the greenback.
The mechanism at work
Stablecoins now function as a low-friction dollar substitute for retail savers in emerging and mid-sized economies. Every purchase of a dollar stablecoin with local currency is, in effect, a small capital outflow. The BOK's contribution is showing this can move an exchange rate even absent panic, purely through steady adoption.
- The Bank of Korea's working paper models stablecoin demand as a channel of currency substitution that depreciates the local unit, per CoinDesk.
- Dollar-pegged stablecoins account for the overwhelming majority of the roughly $170 billion-plus stablecoin market, per public supply trackers cited in the same reporting.
- South Korea has seen retail won-to-stablecoin conversion volumes rise sharply since exchanges expanded won on-ramps, per the CoinDesk writeup of the study.
- The paper reportedly finds the depreciation effect scales with the size of stablecoin holdings relative to a country's monetary base, not with any single shock event.
Why the framing misses the point
Most coverage will frame this as a stablecoin-risk story: another warning about tokens breaking a peg or draining bank deposits. The BOK paper is making a currency-policy argument instead.
It says the won can weaken through ordinary, legal, unremarkable stablecoin purchases, with no run, no depeg, no headline event required.
That reframes the policy target. A central bank worried about deposit flight watches exchange caps and issuer reserves. A central bank worried about currency substitution watches retail on-ramp volume and household dollar-asset holdings, the same metrics it already tracks for capital flight into US Treasuries or offshore accounts.
Korea has reason to be first. Won internationalization has always lagged its trade weight, and capital controls have long pushed savers toward informal dollar channels.
Stablecoins formalize that channel and make it visible. Won-pegged stablecoins have struggled for adoption precisely because dollar tokens already do the job savers want, cheaper and with more liquidity.
What this means for policy
The unremarkable-sounding paper carries a heavier implication once economies scale it up. If retail stablecoin substitution can already register as a depreciation channel in Korea, a $2 trillion-plus deep-liquidity, floating-rate economy, the effect should be sharper in smaller currencies with thinner reserves.
Nigeria, Argentina, Turkey and Vietnam already show heavy retail dollar-stablecoin uptake for reasons unrelated to any Korean study. The BOK has simply put a name and a mechanism on something regulators in those countries have watched anecdotally for years.
The paper does not call for a stablecoin ban. It calls the substitution channel a monetary-policy variable, on par with foreign-currency deposit rules or capital-flow taxes.
That framing matters more than any single headline number, because it puts the tool in the same box as interest-rate policy and reserve requirements, not in the crypto-oversight box where dollar stablecoins usually get filed.
What to watch
- Whether the BOK or another central bank proposes a formal cap or reporting requirement on retail stablecoin conversion volume tied to this paper.
- Won-denominated stablecoin trading volume on Korean exchanges over the next two quarters, watching for acceleration past the historical won-dollar deposit substitution rate.
- Whether any other emerging-market central bank cites the BOK paper directly in its own currency-stability reporting within the next six months.