A Central Limit Order Book (CLOB) is a trading mechanism used by exchanges—both centralized and decentralized—that aggregates buy and sell orders (bids and asks) from market participants at various price points for different asset pairs. In a CLOB, all orders are visible to the market, and trades are executed when matching buy and sell orders meet at the same price. This system is the backbone of most modern crypto and traditional exchanges, providing transparency and efficient price discovery.
CLOBs are commonly used in centralized exchanges (CEXs) and are increasingly being implemented in decentralized exchanges (DEXs) as onchain or hybrid solutions. However, bringing the CLOB model onchain presents challenges, such as higher transaction costs and the risk of front-running, since every order and adjustment requires an onchain transaction
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In summary, a CLOB:
- Aggregates all limit orders in a transparent order book.
- Matches buy and sell orders at the same price.
- Is widely used in both centralized and decentralized trading venues, though onchain implementations face unique technical hurdles123.