Buy orders
$0.59250 contracts
$0.58600 contracts
Sell orders
$0.6175 contracts
$0.62400 contracts
Illustrative order book only. Check live depth before considering an order.
What an order book shows
A Polymarket order book lists resting buy and sell interest for one outcome contract. It shows price and size, not a promise that every displayed level will still exist when you submit an order. New orders, cancellations, and fills can change it at any time.
Read bids and asks
Bids are prices buyers offer. Asks are prices sellers request. For a Yes contract, the highest bid is the best price available to a seller; the lowest ask is the best price available to a buyer.
If the best bid is $0.59 and best ask is $0.61, a buyer seeking an immediate fill pays near $0.61 while a seller seeking an immediate fill receives near $0.59. The $0.02 gap is the spread.
Check spread and depth
A narrow spread is useful, but depth decides whether the market can absorb your size near that price. If only 10 contracts sit at $0.61 and you want 100, the rest may fill at higher asks, partly fill, or not fill. Read several levels on both sides before considering an immediate order.
HBFmarket shows order-book context alongside market discovery and public trader activity. For broader execution detail, read prediction-market liquidity.
Midpoint is not a fill
The midpoint averages the best bid and ask. It can be a useful market signal, but it is not a price at which a buyer or seller is guaranteed to execute. In wide spreads, a displayed price can also reflect the last trade rather than a current midpoint.
Use prediction-market odds calculator for payout math, then return to the live book for executable prices.
Before you submit
- Read full market question and resolution rules.
- Compare best bid, ask, spread, and first few depth levels.
- Decide whether price certainty or immediate execution matters more.
- Confirm side, amount, and order type before signing.
- Re-check live conditions; an estimate is not a fill.
Sources and further reading
Keep learning
What Are Prediction Markets?
A plain-English introduction to prediction markets: what a contract represents, how prices form, and what happens when a market resolves.
How Prediction Market Odds Work
Learn how to read prediction-market odds, why a contract price is often treated as an implied probability, and why it is never a guarantee.
Prediction Market Liquidity Explained
Understand Polymarket order-book liquidity, bid-ask spreads, depth, and why a displayed prediction-market price may not be your fill price.
Prediction Market Risks to Understand
Understand prediction-market risks before you trade: losing positions, thin liquidity, resolution rules, fees, account safety, and changing eligibility requirements.
What Is a Non-Custodial Trading Terminal?
Learn what a non-custodial trading terminal does, what it does not do, and which responsibilities remain with you and the market venue.
Polymarket Copy Trading: Risks and Manual Review
Understand Polymarket copy trading: how public wallet activity can inform research, why it is not a recommendation, and why HBFmarket requires manual confirmation.
Prediction Markets vs Sports Betting
Compare prediction markets and sports betting: contract prices, order books, liquidity, settlement rules, and why each has distinct risks and legal treatment.
Prediction Markets vs Betting
Compare prediction markets and betting: price formation, outcome contracts, liquidity, settlement rules, and risks to check before participating.
Prediction Markets vs Polls
Compare prediction markets and opinion polls: what each measures, how market prices form, and why neither is a guaranteed forecast.
Polymarket vs Kalshi: What to Compare
A dated, practical comparison of Polymarket and Kalshi: event contracts, price formation, order books, fees, access, and which questions to verify before trading.
How to Use Prediction Markets
Learn how to use prediction markets responsibly: read the question, understand odds and liquidity, and check venue eligibility before submitting an order.
How to Evaluate a Polymarket Terminal
A practical checklist for evaluating a Polymarket terminal: market discovery, order-book clarity, wallet safety, venue rules, and transparent trade context.