What Is a Liquidity Pool? Meaning in Crypto
Liquidity pool: A liquidity pool is a smart contract that holds two tokens, for example a memecoin and SOL, so traders can swap one for the other at a price set by the ratio of the two.
Key takeaways
- A liquidity pool is a smart contract that holds two tokens, such as TOKEN and SOL, and lets anyone swap between them without an order book.
- The pool's price comes from the ratio of the two tokens: each buy removes tokens and adds SOL, so the price goes up.
- A small pool means high slippage, and a pool that its creator can remove is the classic way to rug a memecoin.
A liquidity pool is a smart contract that holds two tokens so that traders can swap one for the other. On Solana, a memecoin pool usually pairs the coin with SOL. Instead of an order book, the price comes from the ratio of the two tokens in the pool.
How a liquidity pool works
Liquidity providers deposit both tokens into the pool. When you buy the memecoin, you add SOL and take tokens out, so the token gets scarcer in the pool and its price rises. When you sell, the opposite happens. Ethereum.org describes decentralized exchanges as places that let you "trade different tokens whenever you want" (Ethereum.org); pools are what make that possible.
Example: a pump.fun coin graduates from its bonding curve. Its liquidity moves to a PumpSwap pool that holds the coin and SOL. From then on, every buy and sell trades against that pool.
Why it matters for traders
Pool size decides your fill. Uniswap explains that with thin liquidity a trade has to "slide" along the curve, so larger swaps move the price more (Uniswap). That is slippage. Pool control also decides risk: if the creator can remove the pool, holders can be left with nothing to sell into. Our rug pull guide explains how to check this before you buy.