Polymarket sports markets let you buy YES or NO shares on sports outcomes, and each share pays $1.00 if you're right and $0 if you're wrong. The price in cents works as a live probability: a team trading at 58¢ has roughly a 58% chance of winning according to the market.
Sports are now one of the busiest categories on Polymarket. They look like sports betting, but the mechanics — and the costs — are different.
How a sports market works
Take a market: "Will the home team win?"
- YES trades at 58¢, NO at about 42¢.
- You buy 100 YES shares for $58.
- If the home team wins, you receive $100 — a $42 profit before fees.
- If it loses, the shares are worth $0 and you lose the $58.
You don't have to hold until the end. If the team takes an early lead and YES rises to 80¢, you can sell your 100 shares for $80 and keep a $22 profit, whatever happens later. That flexibility is the biggest practical difference from a traditional bet slip.
Polymarket vs a sportsbook
| Polymarket | Sportsbook | |
|---|---|---|
| Who you trade against | Other users | The bookmaker |
| How prices are set | Supply and demand on an order book | The book's odds, including its margin |
| Cost | Taker fee (makers pay none) | Built-in margin, the overround or vig |
| Exit early | Sell anytime there's a buyer | Only if the book offers cash-out |
| Limits for winning players | No bookmaker to limit you | Books can limit winners |
On a sportsbook, a 50/50 game is often priced so both sides pay less than a fair bet — that gap is the book's profit. On Polymarket, prices on both sides sum to roughly $1.00 and the platform earns a fee instead.
Fees on sports markets
On the international site, Polymarket's fee documentation sets a taker fee rate of 0.05 for sports, applied as:
fee = shares × 0.05 × p × (1 − p)
At a price of 50¢, that is 100 × 0.05 × 0.5 × 0.5 = $1.25 on 100 shares, about 1.25¢ per share. The fee shrinks as prices move towards 1¢ or 99¢. Makers — traders whose resting limit orders get filled — pay no fee and can earn a share of taker fees through maker rebates. See the full table in Polymarket fees.
The US app has its own fee schedule; check the order ticket there.
Live trading: why prices jump
Sports prices react to news in seconds: a goal, an injury, a red card. That creates two risks:
- Slippage. A market order during a big move can fill well above the price you saw. Use limit orders when the book is moving.
- Information gaps. People watching a faster feed than yours may trade before you see the play. Don't assume the price is "wrong" just because your stream says otherwise.
Where can you trade Polymarket sports?
- In the US: only through Polymarket US, and only where your state allows it. Sports contracts are at the centre of the state disputes explained in Polymarket legal states.
- Elsewhere: on the international site, if your country isn't restricted. Malta, for example, is close-only on the website for sports markets.
Using sports data and analysis
Many traders build simple models from team ratings, injuries and schedules, then compare them with the market price. If your estimate of the win chance is higher than the price, the trade has positive expected value — before fees. Be honest about how often your model is right: sports markets are liquid and hard to beat.