An order book is the list of open buy orders (bids) and sell orders (asks) for a contract, with their prices and sizes. Trades happen when a new order matches one already on the book.
Polymarket uses a central limit order book for each outcome; reading its depth shows how much you can buy before the price moves.
👉 How to read a Polymarket order book
Bid-ask spread · Limit order · Slippage
Polymarket uses a central limit order book for each outcome; reading its depth shows how much you can buy before the price moves.
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