Volatility
Price volatility · Historical volatility · Realized volatility · Implied volatility · Vol
How widely and how often a price swings, usually measured as the standard deviation of returns and often quoted on a yearly basis.
Simple explanation
Background: Korean investors say 변동성 (byeondongseong), or just 볼라 for short. Korean stocks may move at most 30% in a day, but crypto in Korea trades around the clock with no daily price limit.
Volatility is about size, not direction. High volatility means the price moves a lot and often, up as well as down. An asset that moves within ±1% a day and one that moves ±10% a day may end the year at the same price, but the ride in between, and the gains and losses along the way, are very different. Crypto is generally more volatile than stocks or currencies, and within crypto, smaller and less traded altcoins usually swing harder than bitcoin.
The usual measure is the standard deviation of daily (or hourly) returns. To turn it into a yearly figure you multiply by the square root of the number of periods in a year: stocks use about 252 trading days, but crypto trades every day, so it uses 365 (daily standard deviation × √365). Worked out from past prices, this is historical or realized volatility. Volatility backed out of option prices, the market's expectation for the future, is implied volatility; like the VIX for US stocks, bitcoin has option-based volatility indexes, such as Deribit's DVOL, which expresses 30-day implied volatility on a yearly basis. Simpler gauges are the gap between the 24-hour high and low, or the 24-hour change.
There are reasons crypto swings so much. Korea's stock market limits daily moves to ±30%, but crypto exchanges have no daily price limits and trade 24 hours a day, every day of the year. High leverage on overseas futures markets adds fuel: when the price moves one way, positions on the other side are liquidated, their market orders push the price further and trigger more liquidations. After the US announced new tariffs on China on October 10, 2025 (UTC), about $19 billion of futures positions were liquidated within a day by CoinGlass's count, and bitcoin fell about 14.5%, from a high of $122,574 to $104,782. In the worst 40 minutes alone, 20:50 to 21:30 UTC (5:50 to 6:30 a.m. on October 11 in Korea), about $6.9 billion was liquidated.
Korea's won exchanges put short-term caution alerts (투자주의) on coins whose prices swing sharply in a short time. From late January 2026, the Financial Supervisory Service and DAXA split these alerts into three levels, caution, warning and danger. According to press reports, a coin gets "danger" if it rises 200% or more or falls 90% or more from the previous day, and a gap between the Korean price and the global price (as tracked by CoinMarketCap) earns caution at 10% to 20%, warning at 20% to 30% and danger at 30% or more. When a coin carries a danger alert for both the price swing and the global gap, only limit orders within a set price band are accepted and market orders are blocked. Right after new listings, exchanges may also block buying for a few minutes or refuse orders priced too far from a reference price. Check the exchanges' notices for the details.
When prices move fast, Korean and overseas exchanges do not keep exactly in step, so the kimchi premium can jump around in a short time. Moving coins to close the gap takes time, and traders at home and abroad react at different speeds. Movements in the won-dollar rate feed straight into the premium as well. So the premium on a wild day needs more careful reading than usual, and anyone trading the premium faces more price risk while coins are in transit. Volatility also pulls Korean trading in all at once: on August 22, 2026, when major coins briefly plunged around 2 p.m. and then swung hard, Upbit's trading value for one hour reportedly reached about ₩1.15 trillion (about $820 million).
High volatility can shrink what you actually keep, even with the same average return. +50% followed by −50% does not get you back to even; it leaves you at −25%, and the bigger the swings, the bigger this drag (volatility drag). Leverage multiplies volatility: a −6% day is roughly a 60% loss of margin on a 10x position. On more volatile coins, stop-losses are more likely to fill lower than planned or to be hit by a brief swing. High volatility means high risk; it does not promise high opportunity.
Volatility is also read as a sign of market mood. alternative.me's Fear and Greed Index gives volatility 25% of its weight, comparing bitcoin's current volatility and maximum drawdowns with their 30-day and 90-day averages and treating an unusual rise in volatility as a sign of fear. Volatility is known to cluster: once it rises it tends to stay high for a while, and calm spells tend to last too. Low volatility does not mean safety, though. A long-quiet price can jump on one piece of news, and even a stablecoin built to hold $1 can swing suddenly if it loses its peg (a de-peg).
CoinGaja's Price and premium heatmap shows each coin's 24-hour price change as coloured tiles: shades of red for rises and blue for falls, deeper for bigger moves, so you can see at a glance which coins are swinging hardest today. A tile's size is its share of 24-hour trading value. In the Kimchi premium by coin table, Upbit's 24-hour change is worked out from Upbit's one-minute candles, using the price exactly 24 hours earlier. Because a price a few seconds old can make the premium look wrong when markets move fast, CoinGaja hides the premium when a Korean exchange's or Binance's price has not updated for more than 20 seconds. The top bar shows the Fear and Greed Index (from alternative.me), and the Listings and delistings page shows the exchanges' caution alerts.
Example
Coin A's daily changes over 5 days: +4%, -3%, +5%, -6%, +2% → average = 2 ÷ 5 = +0.40%
Square each day's distance from the average and add them: 12.96 + 11.56 + 21.16 + 40.96 + 2.56 = 89.2 → daily standard deviation = √(89.2 ÷ 4) = about 4.72% (a sample, so divide by 5 − 1 = 4)
On a yearly basis: 4.72% × √365 (about 19.1) = about 90%
Coin B: +1%, -1%, +0.5%, -0.5%, 0% → daily standard deviation = √(2.5 ÷ 4) = about 0.79% → about 15% a year
Volatility drag: +50% then -50% → 1.5 × 0.5 − 1 = -25.00% / +10% then -10% → 1.1 × 0.9 − 1 = -1.00%
A -6% day → roughly -60% of the margin on a 10x leveraged position (fees and funding aside)
※ Example numbers, for illustration only
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