Kimchi Premium
You'd think the same asset should cost the same everywhere, but crypto prices differ slightly from exchange to exchange. The Korean won market in particular is structurally hard for capital to flow in and out of freely, so when domestic buying surges, the price gap doesn't close right away — it can persist for a while. That Korea-specific markup is the kimchi premium.
The math is simple: (domestic price ÷ overseas price − 1) × 100. Overseas at 100 million won, domestic at 105 million: (1.05 − 1) × 100 = +5%. If the domestic side is cheaper it goes negative — that's called a reverse premium. The number also depends on which exchange rate you use to convert the overseas price into won, so different sites show slightly different readings.
Historically the premium has swung hard with market mood. In the 2017–2018 mania it blew out to around 50% at one point; in frozen markets it has sat near 0% or negative for months. In ordinary times it tends to hover in the low single digits.
So traders read the premium like a thermometer of Korean retail investors. The folklore: a fast-spiking premium is a caution flag that 'Korea is overheating,' while a deepening reverse premium marks 'Korean sentiment has gone cold.'
But a sign of overheating and a prophecy of decline are different things. There have been stretches where price kept climbing with the premium high, and stretches where it kept falling in reverse premium. The kimchi premium shows how hot Korea is running right now — it doesn't point at the next move.
What the data actually shows
The kimchi premium isn't a chart signal, so it isn't among the 28 signals Barobara verifies. For reference, the results of counting chart signals against past data are published openly in the setup stats — and 'it's overheated, so it must fall soon'-style intuitions often came out close to a coin flip in the data. The same attitude applies when reading sentiment gauges like the premium: the fact that things are hot and the prediction that price falls tomorrow are separate, and the only thing you can actually check is the past distribution.Common misconceptions
'A high kimchi premium means a crash is coming' is folklore born from the memory of a few past tops where the premium happened to be high — it isn't a law. Price has climbed further with the premium elevated, and crashed with the premium low. There's also the idea that 'you can arbitrage the premium risk-free' — in practice, price moves while coins are in transit, plus remittance limits and layers of regulatory hurdles, make it far less simple than it sounds. If the arbitrage were easy, the premium would never have opened up in the first place.
FAQ
Q. Why does the kimchi premium exist?
Because capital can't flow freely between the Korean won market and overseas markets. Even when domestic demand pushes prices apart, the arbitrage that would close the gap runs into constraints — so the difference lingers as a premium.
Q. What's a reverse premium?
It's when the domestic price falls below the overseas price, usually appearing when Korean buying interest has cooled sharply. Like the premium itself, it's a marker that domestic sentiment is cold — not, by itself, a signal of a bounce or of further decline.