An automated market maker (AMM) is a smart contract that lets traders swap tokens against a liquidity pool instead of against another party's order: prices come from a formula applied to the pool's reserves, so trading works at any time without a counterparty being online.
An automated market maker (AMM) is a smart contract that lets traders swap tokens against a liquidity pool instead of against another party's order: prices come from a formula applied to the pool's reserves, so trading works at any time without a counterparty being online.
A traditional exchange matches each buyer with a seller in an order book. An AMM removes the matching step: liquidity providers deposit both sides of a market into one pool, and every trader swaps against that pool.
Because the pool is always there, an AMM never closes and never needs a counterparty to be online. The cost is that the pool itself takes the other side of every trade, which moves its price away from the wider market — the effect traders call price impact.
The best-known rule is Uniswap's x · y = k: the pool keeps the product of its two token balances constant, so buying one token raises its price along a curve with each fill. The formula is simple enough to compute on chain, and it is why any ERC-20 pair can have a working market from two deposits.
Newer designs refine the same idea. Concentrated liquidity lets a provider allocate their tokens across only a price range they choose, which multiplies the depth their capital offers near the current price. A singleton design such as Uniswap v4 holds every pool in one contract, which makes pools cheaper to create and lets each one carry extra logic — a hook.
Each swap pays an LP fee — a fraction of the trade set by the pool — which accrues to the positions whose liquidity was actually used. That fee compensates LPs for lending assets to strangers' trades; providing liquidity is not risk-free, because the pool's mix shifts as prices move around them.
Hookr's current generation opens Uniswap v4 pools on Robinhood Chain (chain id 4663) in two ways: an Instant Launch opens a locked token-only sell band in the launch transaction, while a successful clearing-price auction migrates into a locked full-range position. The pool's base AMM math stays Uniswap's; the hook chosen before launch adds per-swap rules, and those parameters are readable before trading.