Liquidity pool

A liquidity pool is a smart contract holding reserves of two or more tokens that users, called liquidity providers, deposit. Those reserves supply the funds that traders swap against on an automated market maker. In return, providers typically receive a share of the trading fees and a token representing their stake in the pool, proportional to what they contributed.

Why it matters

Pools replaced the need for professional market makers, letting ordinary users provide the depth that makes trading possible. Deeper pools mean lower slippage and more reliable pricing. The trade-off for providers is exposure to impermanent loss when the pooled tokens change in relative price, plus smart-contract risk if the pool’s code is flawed or the token itself is malicious. Fee income may or may not offset those risks over time. The value of a provider’s share also fluctuates with the pooled assets, so the position should be understood as active market exposure rather than a fixed-rate deposit, and pools for obscure or newly created tokens carry the additional danger that the token itself is fraudulent.

Common misunderstanding

Providing liquidity is often described as passive income, implying it is low risk. In reality a provider takes on price exposure to both assets and can end up with less value than simply holding them, especially in volatile pairs. Deposited funds are also only as safe as the underlying contract and tokens, so a high advertised yield can simply be compensation for elevated risk rather than a bargain.

Related terms

See automated market maker, impermanent loss, DeFi and honeypot token.