Liquidity Pool

A liquidity pool is a smart contract holding reserves of two or more tokens that enable decentralized trading. Instead of matching buyers and sellers directly, traders swap against the pooled tokens, and the smart contract determines the price algorithmically.

How Liquidity Pools Work:

1. Liquidity providers (LPs) deposit equal value of two tokens (e.g., $500 ETH + $500 USDC)
2. They receive LP tokens representing their share of the pool
3. Traders swap against the pool, paying a fee (typically 0.3%)
4. Fees are distributed proportionally to all LPs
5. LPs can withdraw their tokens plus earned fees at any time

Types of Liquidity Pools:

Standard Pools (x * y = k): - Two tokens, equal value deposits - Used by Uniswap v2, SushiSwap - Simple but capital-inefficient

Concentrated Liquidity: - LPs choose specific price ranges - Higher capital efficiency within that range - Used by Uniswap v3, Trader Joe v2

Stable Pools: - Optimized for same-value assets (USDC/USDT) - Low slippage between pegged assets - Used by Curve Finance

Weighted Pools: - Custom token ratios (e.g., 80/20) - Used by Balancer

Earning Potential: LP returns come from trading fees and sometimes additional token rewards (liquidity mining). APYs range from 2-5% for stablecoin pairs to 50%+ for volatile new token pairs, though higher yields carry proportionally higher risk.

Key Risk - Impermanent Loss: When the price ratio of pooled tokens changes, LPs may end up with less value than simply holding the tokens. This loss becomes permanent only when withdrawing during unfavorable price ratios.