Liquidity
Also called: market liquidity · market depth
Definition
Liquidity is how easily you can buy or sell an asset quickly, in size, without moving its price much.
How liquidity works
On an exchange, liquidity shows up in the order book. A liquid market has many buy and sell orders close to the current price, so the bid-ask spread is narrow and a large order fills at nearly the price you see. An illiquid market has few orders, wide gaps between price levels and a wide spread.
Liquidity matters because it sets your real trading cost. In a thin market, a market order walks through several price levels and fills at a worse average price, which is called slippage. Thin markets also move more sharply on small orders, which can trigger stop-losses and liquidations.
Liquidity is not fixed. Major pairs like BTC/USDT are usually deep on large exchanges, while small tokens can be thin even on big venues. It also drops at weekends, during holidays and in sudden sell-offs. In DeFi, liquidity comes from liquidity pools rather than an order book, but the idea is the same: more depth means less price impact.
Example
Imagine you want to sell 50,000 coins of a small token. The best bid is 1.000 USDT, but only 10,000 coins are wanted there. The next 20,000 coins are bid at 0.990, and the remaining 20,000 at 0.970. Your market sell brings in 10,000 + 19,800 + 19,400 = 49,200 USDT, an average of 0.984, about 1.6% below the price on screen. On a liquid pair, the same order might fill within 0.05% of the displayed price.
Common mistakes
- Judging liquidity by the last price or the 24-hour volume figure instead of looking at order book depth near the price.
- Placing large market orders in thin pairs and being surprised by the fill price.
- Assuming a token that is liquid on one exchange is equally liquid on every exchange.
Learn and practise
FAQ
How can I check the liquidity of a crypto pair?
Look at the bid-ask spread and at how much volume sits within 1% or 2% of the current price in the order book. Many exchanges show this as a depth chart.
Why is low liquidity risky?
Low liquidity means larger slippage, wider spreads and sharper price moves. Getting out of a position quickly can cost much more than expected.