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A one-standard-deviation jump in Bitcoin Google searches raised Korea's dollar-stablecoin premium by about 0.85 percentage points. The won–dollar rate did not move in a statistically meaningful way.
That's the split in Bank of Korea Issue Note No. 2026-22, released 3 September 2026. This post lays out what the note measured, why Brazil looks like Korea's inverse, and what you should watch if Korea opens the market.
Key Takeaways
- Kim Ji-hyun and Cho Sang-heum published BOK Issue Note No. 2026-22 on 3 September 2026.
- Binance fiat–dollar stablecoin support cut premiums by 0.33–0.38 percentage points.
- After that support, higher premiums associated with local-currency depreciation versus the dollar.
- In Korea, a one-standard-deviation Bitcoin-search shock raised the premium about 0.85 percentage points.
- The researchers say digital-asset rules should move with won internationalization and a deeper FX market.
What the Issue Note actually is
The Korean-language title is "The Linkage Between Dollar Stablecoins and the Foreign Exchange Market: Focusing on the Role of Global Exchanges." Kim and Cho are managers on the International Finance Research Team in the BOK's International Department.
The PDF states the findings are the authors' views, not the Bank of Korea's official position. Read it as staff research, not a policy vote.
The official Issue Note is on bok.or.kr, dated 3 September 2026. Yonhap and Aju Press carried the same figures the same day.
Dollar stablecoins in the study are USDT and USDC. The operating differences between those two dollars are in Stablecoin Insider's USDT vs USDC guide.
Two channels, one listing event
Let's start with the mechanism. Buying a dollar stablecoin with a non-dollar currency is economically close to buying a dollar asset with that currency.
Whether that demand hits the FX market depends on who sits in the middle. If a global intermediary can warehouse both the stablecoin and the FX book, a local-fiat purchase can become a dollar purchase.
The researchers treat a Binance listing of a fiat–dollar stablecoin pair as the moment those intermediaries can participate. They use 2019–2025 data for 12 currencies, including the euro, the Turkish lira, and the South African rand.
First of all, price integration. After Binance support, local dollar-stablecoin premiums fell by a statistically significant 0.33–0.38 percentage points.
When local-exchange premiums sat above Binance, dollar stablecoins flowed from Binance into the local market. That is the arbitrage the listing is supposed to unlock.
Then shock transmission. After support, higher premiums associated with local-currency depreciation versus the dollar.
Before support, that premium–FX relationship was not statistically meaningful. Tighter prices and more FX passthrough arrive as a pair.
Here's why that matters for you. A smaller premium is not a free lunch if the residual demand now prints in the exchange rate.
Korea absorbs the shock in the premium; Brazil prints it in FX
Korea has no Binance KRW–USDT or KRW–USDC pair. Corporate and foreign participation in the domestic virtual-asset market remains restricted.
Brazil has a Binance BRL pair, so the same kind of demand can be warehoused into FX. The researchers use a one-standard-deviation rise in Bitcoin Google searches as a crypto-demand proxy and compare the two markets.
| Market | Binance fiat–dollar stablecoin pair | 1 SD Bitcoin-search shock (premium) | Same shock (FX vs USD) |
|---|---|---|---|
| Korea | No KRW pair; corporates and foreigners restricted | ~0.85 pp | Not statistically meaningful |
| Brazil | BRL pair available | ~0.11 pp | Real weakened ~0.12% |
That Brazil FX print is small in a single shock. It's still a different channel from Korea's.
On the flip side, Korea pays for the closed structure in the price. The median won-denominated dollar-stablecoin premium since 2022 is 1.67% on USDT.
That's against a 30-currency median of about 0.8% in the same table. It sits next to Ukraine at 1.86% and South Africa at 1.80%, where capital controls are much tighter.
At first glance, that looks like a closed capital account. Korea's capital markets are more open than those two comparators.
The researchers say the missing piece is market structure. Global intermediaries can't close the gap, so the premium can sit wide.
That structure also shows up as capital leaving licensed Korean venues. Stablecoin Insider documented 18 months of net stablecoin outflows through June 2026.
Dollar demand that never prints in the official FX tape is a sovereignty problem, not just a trading quirk. The IMF-facing version of that argument is in Do Stablecoins Undermine Monetary Sovereignty?.
The policy ask is a package, not a ban
The researchers are not arguing that Korea should block the link. They say digital-asset rulemaking, won internationalization, and FX-market deepening have to be treated as one package.
If corporates and foreigners get access, the stablecoin–FX link could strengthen. A deeper, more international won market is what they say would absorb the shock.
Korean banks are already building rails ahead of finished rules. Shinhan's 26 August 2026 Visa agreement is that preparation, covered in Shinhan Signs Visa Deal to Build Korea's Stablecoin Payment Rails.
Stablecoin Insider's take: Korea's 1.67% premium is a closed-market price, not proof the won already trades off USDT ticks. Treat the note as a map of what happens if intermediaries arrive, not as a live FX signal.
The downside is easy to miss. If you run KRW treasury off that 0.85 percentage-point premium as if it were a won–dollar move, you'll overtrade a retail bottleneck.
If Seoul opens access without deeper FX liquidity, the Brazil pattern is the named risk: a smaller premium, and a real FX print. Won internationalization is slow, so the sequencing is the tradeoff, not the headline.
What to watch next
Watch three facts, not the title. First, whether corporates and foreigners can trade on Korean virtual-asset exchanges.
Second, whether a KRW–dollar stablecoin pair appears on a global venue. Third, whether won-internationalization work shows up as more FX participants, not just a speech.
Until those land, Korea still looks like the no-pair column. Brazil is the pair column.
Don't mix them up.
FAQ
1. What did the Bank of Korea publish on 3 September 2026?
Issue Note No. 2026-22, by Kim Ji-hyun and Cho Sang-heum of the International Finance Research Team. The PDF states the views are the authors', not official BOK policy.
2. Does dollar-stablecoin demand already move the won?
Not in a statistically meaningful way in this note. A one-standard-deviation Bitcoin-search shock raised Korea's premium about 0.85 percentage points and left the won–dollar rate insignificant.
3. What changes when Binance lists a fiat–dollar stablecoin pair?
Local premiums fell 0.33–0.38 percentage points after support. Higher premiums then associated with local-currency depreciation versus the dollar, a link that was not statistically meaningful before the listing.
4. Why is Korea's premium so high if capital markets are open?
The median won-denominated USDT premium since 2022 is 1.67%, near Ukraine (1.86%) and South Africa (1.80%), against a 30-currency median of about 0.8%. The researchers point to a missing global intermediary, not capital-account closure.
5. What policy mix do the researchers recommend?
Digital-asset rulemaking together with won internationalization and a deeper FX market. They treat those as one package so any stronger stablecoin–FX link has more liquidity to absorb it.
Disclaimer: This content is provided for informational and educational purposes only and does not constitute financial, investment, legal, or tax advice; no material herein should be interpreted as a recommendation, endorsement, or solicitation to buy or sell any financial instrument, and readers should conduct their own independent research or consult a qualified professional.
