Liquidity
Market liquidity · Market depth · Liquidity provision (LP) · Liquid and illiquid markets
How easily a coin can be bought or sold when you want, in the size you want, without moving its price much.
Simple explanation
Background: Korean investors use 유동성 both for how easily a coin trades and, in market talk, for the amount of money sloshing around the economy (유동성 장세, a "liquidity-driven rally"). On Korean exchanges, liquidity is concentrated in the won markets, and the same coin can be deep on one exchange and thin on another.
Liquidity is how easily something can be turned into cash. In crypto it is usually judged on three things: is the bid-ask spread tight; are there plenty of orders resting near the current price (the depth of the order book); and is trading value high enough that a large order quickly finds someone on the other side. How fast fresh orders refill the book after a big order sweeps through it matters too. When all of these are good, a market is called liquid or deep; when they are poor, it is thin or illiquid.
In a liquid coin, even a large order fills at an average price close to the last price. In a thin coin, a market order of a few thousand dollars can chew through several levels of the book and move the price by several percent (slippage), and when you want to sell there may be no bids near the price on screen, so you end up selling far lower. Sudden long wicks on a chart are often the trace of a big order sweeping a thin book. A large market capitalization does not guarantee liquidity either; what counts is how many coins are actually in circulation and changing hands.
Liquidity depends on where and when you trade. A busy exchange's won market is deep, while the same exchange's BTC and USDT markets are often much thinner. In quiet hours such as late night, weekends and holidays, the book empties and prices jump easily; when big news breaks, the people quoting pull their orders and liquidity can dry up in seconds. Right after a listing, few coins have reached Korean exchanges yet, so books are thin; Upbit's listing notices have at times blocked buy orders for the first few minutes of trading and accepted only limit orders for the first couple of hours. The conditions vary by notice, so read the original.
Those who keep quotes on the book are called liquidity providers (LPs) or market makers (MMs). A token's issuer sometimes hires a specialist firm to keep its book filled after a listing. The line between genuine liquidity provision and price manipulation can blur, though: among the cases Korea's Financial Services Commission described in July 2026 was an issuing foundation that used automated (API) trading to fire rapid buys and sells and place phantom orders, pushed the price up, and then sold its coins. A thick book and busy trading do not by themselves prove real demand.
Liquidity is tightly tied to the kimchi premium. What keeps Korean and overseas prices close is arbitrage, and arbitrage needs enough liquidity on both sides and coins that can move freely between them. When deposits or withdrawals are suspended, overseas coins cannot flow in, Korean liquidity is trapped, and modest buying can push the premium to tens of percent. The Financial Services Commission lists exploiting exactly such a temporary deposit or withdrawal suspension at some exchanges to push a price up and then sell (the "fish pen" scheme, 가두리) as a typical manipulation method. A big premium on a barely traded coin may not mean anyone could actually trade a large amount at that price.
The word also describes the amount of money in the system. When central banks cut rates or add money, people say liquidity has increased, and a period when that money pours into risky assets such as stocks and crypto is called a liquidity-driven rally; when rates rise and money tightens, it tends to drain out of them. In DeFi, "providing liquidity" means depositing a pair of coins in a pool so that others can trade against it; you share the trading fees, but if the price ratio of the two coins changes a lot you can end up worse off than if you had simply held them (impermanent loss).
The thinner the coin, the more there is to check before trading: how many levels of the book your amount will reach, how wide the spread is in percent, and how big your order is next to a day's trading value. These tell you roughly what buying or selling will cost. Liquidity is often more of a problem when selling than when buying, because bids tend to thin out first when prices fall, so you may not be able to sell at the price on screen.
On CoinGaja, the 24-hour trading value column on Kimchi premium by coin and the tile sizes on the Price and premium heatmap (each tile's share of 24-hour trading value) show where the money is going. The Kimchi Premium Calculator fills your amount through each exchange's live order book at the moment you calculate and takes slippage off, so you can see how much less of the same premium survives on a thin coin. The deposit and withdrawal suspension page shows coins whose wallets are closed, cutting the flow of coins between Korea and abroad.
Example
Coin B asks: ₩1,000 × 4,000 · ₩1,020 × 3,000 · ₩1,050 × 2,800 (last price ₩1,000)
A market buy of ₩10,000,000 (about $7,100) → ₩4,000,000 + ₩3,060,000 + ₩2,940,000 = ₩10,000,000 for 9,800 coins → average ₩10,000,000 ÷ 9,800 = about ₩1,020.41 (+2.04%)
That one order leaves the last price at ₩1,050 (+5.00%) → if the overseas price is ₩1,000 in won, the premium goes from 0% to +5.00%
On Coin A, with over ₩500 million (about $357,000) offered at ₩1,000 → the same ₩10,000,000 order fills entirely at ₩1,000, price change 0%
If Coin B trades only ₩20,000,000 (about $14,300) a day → ₩10,000,000 is half a day's trading, so selling back out could also push the price down hard
※ Example numbers, for illustration only
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