How to Buy YES and NO Shares on Polymarket (2026)
Simple walkthrough for buying YES and NO prediction market shares on Polymarket. Covers pricing, order placement, and what happens at resolution.
Table of Contents
How YES/NO Pricing Works
Every Polymarket market has two outcomes: YES and NO. Prices range from $0.01 to $0.99 and represent the market's implied probability. YES at $0.65 means the crowd estimates a 65% chance the event occurs.
YES and NO prices on the orderbook are independent. Sometimes YES + NO adds to less than $1.00 (arbitrage opportunity) or slightly more (the spread). In a perfectly efficient market, YES + NO = $1.00.
Step-by-Step: Buying Shares
Open any market on Polymarket. Choose YES or NO. Enter your desired price (limit order) or accept the best available price (market order). Enter the dollar amount and click Buy.
Your order goes to Polymarket's CLOB (Central Limit Order Book). Limit orders wait until someone matches your price. Market orders fill immediately at the best available price.
What Happens When Markets Resolve
When the event outcome is determined, Polymarket resolves the market. Winning shares (YES if event happened, NO if it did not) pay $1.00 each. Losing shares pay $0.00.
Resolution happens automatically through Polymarket's oracle system. USDC is deposited to your wallet within minutes of resolution. No action required on your part.
Tips for Buying YES/NO Shares
Use limit orders to avoid taker fees. On crypto rolling markets, maker orders pay zero fees while taker orders pay ~2%. Always use GTC (Good Til Cancelled) limit orders for better pricing.
Start with markets you understand. Check the orderbook depth before placing large orders to avoid slippage. Consider using PredictEngine to automate your buying strategy across multiple markets simultaneously.
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Frequently Asked Questions
Do YES and NO always add up to $1?
Not necessarily. The orderbook prices are independent. Sometimes YES + NO is less than $1 (an arbitrage opportunity) or slightly more. Market makers help keep them close to $1.
Can I buy both YES and NO?
Yes. This is actually the basis of arbitrage strategies. If YES + NO costs less than $1, you profit regardless of the outcome.
How many shares can I buy?
As many as the orderbook liquidity allows. For large orders, check the orderbook depth to estimate slippage.
Can I sell my shares before resolution?
Yes. You can sell at any time at the current market price. This lets you take profits early or cut losses without waiting for resolution.