Market Maker
In simple terms
A market maker is like a currency exchange booth at an airport—they always have both dollars and euros on hand and buy from you at one price while selling to you at a slightly higher price. They profit from that small difference while making sure there's always someone willing to trade with you.
Definition
Entity that continuously provides buy and sell orders, earning the spread.
In depth
A market maker is a liquidity provider that maintains open orders on both sides of a trading pair simultaneously, quoting bid (buy) and ask (sell) prices with a consistent spread between them. By continuously replenishing inventory through these matched trades, market makers capture the bid-ask spread as profit while reducing slippage and enabling other traders to execute orders without waiting for natural counterparties. Market makers are essential infrastructure in both centralized exchanges and decentralized protocols (via automated market makers or AMMs), where algorithmic or human-operated entities balance their exposure through arbitrage and hedging strategies across multiple venues.
How does Market Maker work?
A market maker posts two resting limit orders at once: a bid slightly below the current price and an ask slightly above it. Both sit in the order book waiting. When one side is hit by an incoming taker order, the maker holds inventory it did not choose, so it immediately re-quotes, often shifting both prices to attract the offsetting trade. Repeating this thousands of times, it earns the spread between its buy and sell prices. Most exchanges charge makers a lower fee than takers to encourage the behavior. Sharp one-way moves can leave the maker holding losing inventory.
An example
Illustrative figures only. A firm quotes a token with a bid of $100.00 and an ask of $100.20. A taker sells 10 units into the bid, costing the firm $1,000. Minutes later another taker buys 10 units at the ask, paying $1,002. The firm nets $2 on that round trip before fees. Had the price instead fallen to $99.00 before it could sell, the same inventory would have been worth $990.
Figures are illustrative only.
What beginners get wrong
- Market makers do not guarantee an orderly market; they can widen quotes or stop quoting entirely during volatility, which is when spreads get worst.
- An automated market maker is a different thing: a DeFi pricing formula, not a firm posting quotes on an order book.
- Lower maker fees are not free money, because a limit order only earns them if it actually rests in the book and fills.
- Seeing a large order appear and vanish is usually routine re-quoting rather than evidence that someone is manipulating the price.
Related terms
Part of
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Educational only — not financial advice.