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What is an Automated Market Maker (AMM)? 

An automated market maker (AMM) is a type of decentralized exchange (DEX) protocol that relies on a mathematical formula to price assets. Instead of using an order book like a traditional exchange, assets are priced according to a pricing algorithm.

This formula can vary with each protocol. For example, Uniswap uses x * y = k, where x is the amount of one token in the liquidity pool, and y is the amount of the other. In this formula, k is a fixed constant, meaning the pool’s total liquidity always has to remain the same. Other AMMs will use other formulas for the specific use cases they target. The similarity between all of them, however, is that they determine the prices algorithmically.

How does an automated market maker (AMM) work?

An AMM works similarly to an order book exchange in that there are trading pairs – for example, ETH/DAI. However, you don’t need to have a counterparty (another trader) on the other side to make a trade. Instead, you interact with a smart contract that “makes” the market for you.

On a decentralized exchange like Binance DEx or Uniswap, trades happen directly between user wallets. If you sell BNB for BUSD on Binance DEX, there’s someone else on the other side of the trade buying BNB with their BUSD. We can call this a peer-to-peer (P2P) transaction. 

In contrast, you could think of AMMs as peer-to-contract (P2C). There’s no need for counterparties in the traditional sense, as trades happen between users and contracts. Since there’s no order book, there are also no order types on an AMM. What price you get for an asset you want to buy or sell is determined by a formula instead. Although it’s worth noting that some future AMM designs may counteract this limitation.

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