Automated Market Maker (AMM)
Web3 / defi
An Automated Market Maker is a decentralized exchange protocol that uses mathematically defined liquidity pools and algorithmic pricing formulas to facilitate token trading without relying on traditional order books or centralized market makers. Users contribute token pairs to liquidity pools and earn fees from trades executed against those pools. The AMM employs a constant product formula (such as x × y = k) that automatically adjusts token prices based on pool ratios—larger trades experience greater slippage as they move prices further from equilibrium. This mechanism enables permissionless, non-custodial trading while maintaining liquidity availability even for low-volume assets. Example: Uniswap pioneered the AMM model with its constant product formula, allowing anyone to provide liquidity and earn proportional trading fees without intermediaries. Uniswap V3 introduced concentrated liquidity, enabling capital-efficient market making by allowing liquidity providers to specify price ranges for their capital deployment, reducing slippage and improving returns. Why it matters for DeFi: AMMs transformed DeFi by eliminating reliance on centralized liquidity providers and order books, enabling permissionless trading and liquidity provision, and creating the foundational primitive that unlocked modern DeFi's composability and explosive growth.
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