Glossary · Market Structure
Central Limit Order Book (CLOB)
Also: CLOB, central limit order book, order book
Published
Central Limit Order Book (CLOB) — A central limit order book (CLOB) is a venue mechanism that collects resting buy and sell orders from all participants, displays them by price level, and matches incoming orders against them by price and then time priority. Most centralized digital asset exchanges run a CLOB, and market makers supply most of its displayed depth.
How Matching Works
Participants submit limit orders that rest on the book at a stated price, or market orders that execute immediately against the best resting orders. The matching engine ranks resting orders by price first and by arrival time second, so the best-priced order that arrived earliest fills first. The result is a continuous, public price for the displayed quantity at each level.
What the Book Shows and Hides
A CLOB is transparent about what is displayed and silent about everything else. Participants see the price and quantity at each level, but not who placed the orders or how much more they would trade. Displayed depth is often a fraction of the liquidity a market maker would supply in response to a request, because resting size is exposed to adverse selection.
Where CLOBs Fit for Institutions
For orders that are small relative to displayed depth in a liquid pair, a CLOB delivers immediate execution at a visible spread. For orders that exceed depth, each fill consumes a level and signals remaining intent, which is why institutional desks route blocks through request-for-quote workflows or dark pools instead. Market makers, meanwhile, use CLOBs as the venues on which they quote and hedge.