How easily an asset can be bought or sold without significantly affecting its price. More liquidity = tighter spreads.
Liquidity in crypto refers to how easily a token can be bought or sold without causing a significant price impact. High liquidity means large orders can execute near the displayed price with tight bid-ask spreads; low liquidity means even moderate trades can move the price dramatically (high slippage). Bitcoin and Ethereum have deep liquidity across many exchanges, while smaller tokens may have thin order books where a $10,000 sell order crashes the price 20%. Liquidity comes from market makers, liquidity pools on DEXs, and active traders. It's arguably the most important factor for a healthy market — without sufficient liquidity, price discovery is unreliable and large holders can manipulate prices. DeFi protocols like Uniswap solve liquidity through AMMs, where anyone can deposit tokens to create a market, but this introduces risks like impermanent loss.
Liquidity measures how easily an asset can be bought or sold without significantly moving the price. High liquidity means large orders can be filled with minimal price impact (slippage), while low liquidity means even modest trades can move the price substantially. In crypto, liquidity varies enormously: Bitcoin and Ethereum can absorb millions in orders with minimal slippage, while small-cap altcoins may see 5-10% price impact from a few thousand dollars. Liquidity comes from market makers (professional firms providing continuous buy/sell orders), AMM pools (where users deposit tokens as liquidity), and organic trading activity. The depth of order books or AMM pools at various price levels determines effective liquidity. 'Liquidity crisis' events — where many sellers appear simultaneously but few buyers exist — have caused some of crypto's most dramatic crashes, as cascading liquidations create a self-reinforcing downward spiral.
A large-cap coin like Bitcoin might have $500M in order book depth within 2% of the current price on Binance, while a micro-cap meme coin might have only $50K — meaning a $100K sell would barely dent BTC's price but could crash the meme coin 30%.
Low liquidity means you may not be able to sell at the displayed price — large orders in thin markets move the price against you (slippage). Before investing significant amounts in any token, check its 24h trading volume and order book depth. If your position size exceeds 1-2% of daily volume, you may have difficulty exiting without significant price impact.