How High Is a High Kimchi Premium?

When you compare Korean and overseas prices of Bitcoin or altcoins, you often see figures like a 1%, 3%, 5% or 10% kimchi premium. But it is not obvious whether a 2% premium is already high or whether it takes about 5%.

The short answer: there is no official line above which the kimchi premium counts as high. The same 3% can mean different things when the market is quiet and when Korean coin trading is overheated.

Still, looking at how the premium has moved in the past together with the market helps you judge whether today's premium is higher than usual.

What is the kimchi premium?

Put simply, the kimchi premium is the same crypto trading at a higher price on Korean exchanges than on overseas exchanges.

For example, suppose the overseas Bitcoin price at the exchange rate is ₩100 million while it trades at ₩105 million on a Korean exchange. The Korean price is about 5% higher, so the kimchi premium is about 5%.

If the Korean price is lower than abroad, the premium turns negative; this is often called a reverse premium.

So from what % is the premium high?

There is no official standard, but rather than reading one number, it is better to look at how far the premium has moved from its usual level.

These ranges are not an investment rule but a reference for understanding the size of the premium. The usual level itself changes with the market, so do not judge the market from a single 3% or 5% figure.

Is a 1–2% premium nothing much?

As a number, 1–2% can look small. But the higher the Bitcoin price, the bigger the actual gap in won.

For example, if one Bitcoin is worth ₩150 million at the overseas price and exchange rate, a 1% premium is a gap of about ₩1.5 million, 3% about ₩4.5 million and 5% about ₩7.5 million.

So the premium is easier to understand when you look at how much the gap is in won, not only at the percentage.

What to watch when the premium goes above 5%

If the premium rises faster than usual, first look at trading volume and buying on Korean exchanges. When Korean buyers are stronger than overseas buyers, Korean prices can rise relatively faster and the premium widens.

Studies of the kimchi premium have pointed to Korean trading volume, price volatility, the exchange rate and limits on moving money between countries as related factors.

So rather than the fact that the premium is 5%, it matters more whether a 1% premium jumped to 5% in a short time, and whether the premium is widening not only on Bitcoin but on many altcoins at the same time.

Is a premium of 10% or more always a sign of overheating?

A 10% premium means Korean and overseas prices are quite far apart, but a high premium alone does not mean that Bitcoin or altcoin prices will soon fall.

In the past the premium has gone well above 10%. Research data show periods of strong Korean crypto fever when Bitcoin traded more than 20% higher than abroad.

But high premiums in the past do not mean the same moves will repeat now: market size, trading conditions, regulation and the mix of investors keep changing.

Why does the kimchi premium rise?

The most obvious cause is buying demand in Korea becoming stronger than abroad. Even for the same Bitcoin, when relatively more people want to buy it in Korea, Korean exchange prices can rise above overseas prices.

In ordinary financial markets, such a gap would normally close quickly as arbitrage buys in the cheap market and sells in the dear one.

But crypto trading between Korea and abroad faces real limits: moving won and foreign currency, exchange deposits and withdrawals, regulations and trading costs. So a gap does not always disappear right away.

Why you cannot read the premium without the exchange rate

The won–dollar exchange rate is especially important in calculating the kimchi premium.

Overseas exchanges mostly show the Bitcoin price in dollars or USDT, while Korean won exchanges such as Upbit and Bithumb show it in won. To compare the two properly, you have to convert them into the same currency.

For example, even if the overseas Bitcoin price stays the same, a big move in the won–dollar rate changes the overseas price in won, and the calculated premium changes with it.

So rather than simply saying "Bitcoin on Upbit is a few million won dearer than abroad", compare the Korean price with the overseas price at the current exchange rate.

The Bitcoin premium and altcoin premiums may differ

Another point: not every coin has the same kimchi premium.

Bitcoin has huge global volume, but some altcoins trade mostly on Korean exchanges. When Korean buying suddenly picks up in such coins, the gap between Korean and overseas prices can be much larger than for Bitcoin.

So do not assume from Bitcoin's premium that every altcoin has a similar gap. For the coins you are interested in, compare their own Korean and overseas prices.

If the premium is high, why not buy abroad and sell in Korea?

Arbitrage is the first thing most people think of when they meet the kimchi premium: buying a coin cheaply abroad, sending it to a Korean exchange and selling it for more looks like a profit.

In a real trade, though, you have to consider trading and withdrawal fees, exchange-rate differences, transfer time and possible suspensions of deposits and withdrawals. Moving money between Korea and abroad also involves laws and procedures to follow, such as the exchanges' identity checks and the Travel Rule.

And because crypto prices and the premium can move very fast, a gap that existed when you started the transfer may already have shrunk when the coin reaches the Korean exchange.

So the premium shown on screen does not become your actual return as it is.

What to check together with the kimchi premium

Rather than one premium figure, checking the Bitcoin price, Korean and overseas trading volume, the won–dollar rate, the USDT price and the premiums of major altcoins together helps you understand the market.

Especially when a premium that usually sits around 1–2% widens quickly to 4%, 5% or 7%, look not only at the current number but also at how fast the premium is changing.

So from what % should you call the premium high?

There is no official definition of a "high" kimchi premium. So calling 3% or more automatically high, or 5% or more automatically overheated, is not the right approach.

That said, once the gap between Korean and overseas prices goes beyond 3–5%, it is worth watching whether the gap is wider than usual; at 5–10%, checking Korean volume, buying and the exchange rate becomes more important; and above 10%, it is clear that Korean and overseas prices have drifted quite far apart.

In the end, what matters is not one particular number but how today's premium compares with its usual level, how fast it is changing, and what is changing in the Korean and overseas markets at the same time.