Prediction markets
Order book
The list of resting buy and sell orders at each price for a contract.
The order book shows depth: how many contracts are bid at 61, 60, 59 cents and offered at 64, 65, 66. Reading it tells you the price a large order would actually get, which can be far from the displayed last trade.
Polymarket runs a central limit order book (CLOB) with on-chain settlement; Kalshi runs a traditional exchange book. Both publish book data through public APIs, which is where BetG8 reads bids, asks and spreads.
A book with orders stacked on one side signals where traders expect the price to go, or where a large participant is defending a level.
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Where you will see it on BetG8
More prediction markets terms
Frequently asked questions
- What does "Order book" mean?
- The list of resting buy and sell orders at each price for a contract.
- Why does order book matter for prediction markets?
- A book with orders stacked on one side signals where traders expect the price to go, or where a large participant is defending a level.