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Educational Post

What is a Matching Engine?

Have you ever wondered about the magic that occurs behind the screens when you trade stocks or cryptocurrencies? How does an online trading platform or exchange perfectly pair the countless buy and sell orders from traders all around the world? The answer lies in a powerful tool called the matching engine.

At its core, a matching engine is a sophisticated piece of software designed to pair buyers and sellers in financial markets. To unpack how it works, let's start with a trading exchange.

Traders interact with the exchange to place their buy or sell orders. Each order includes specific details, such as the type of asset (like a stock, commodity, or cryptocurrency), the volume, and the price at which they wish to buy or sell.

Once the order is placed, it's the matching engine that processes and matches them. Think of it as an extremely diligent middleman, processing hundreds of orders in a fraction of a second. It goes over these orders and pairs off buyers and sellers according to their stipulated criteria.

Primarily, the matching process works by following two key rules: price and time. The matching engine will first match orders with the same price. If there are multiple orders with the same price, it prioritizes them based on the time they were placed. This is commonly referred to as "price-time priority" in the trading world.