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Sports Prediction Markets
Game and season outcome markets priced across Kalshi and Polymarket.
Biggest disagreement on this page: Barcelona vs Aston Villa: Total Goals — the venues are 0.5 points apart on FC FC: O/U 2.5.
Barcelona vs Aston Villa: Total Goals
FC FC: O/U 2.5 leads at 82%. Kalshi and Polymarket agree across the whole field — nothing more than a point apart.
| Outcome | Kalshi | Polymarket | Gap pts | 24h pts | |
|---|---|---|---|---|---|
| FC FC: O/U 2.5 | 82¢ | 82¢ | 0.5 | +1.0 | |
| FC FC: O/U 3.5 | 65¢ | 64¢ | 0.5 | — | |
| Over 4.5 goals scored | 44¢ | 44¢ | 0.5 | — |
Galatasaray vs Stuttgart: Total Goals
SK VfB Stuttgart: O/U 0.5 leads at 98%. Kalshi and Polymarket agree across the whole field — nothing more than a point apart.
| Outcome | Kalshi | Polymarket | Gap pts | 24h pts | |
|---|---|---|---|---|---|
| SK VfB Stuttgart: O/U 0.5 | 98¢ | 98¢ | 0.0 | — | |
| Over 3.5 goals scored | 51¢ | 51¢ | 0.5 | — |
Single markets
Nothing matches that filter.
How to read these odds
A prediction-market price is the probability. A contract trading at 24¢ pays $1 if the event happens, so the market is saying roughly a 24% chance. That is the whole conversion — no vig to strip out, no moneyline to decode.
| Price | Implied chance | American odds |
|---|---|---|
| 5¢ | 5% | +1900 |
| 10¢ | 10% | +900 |
| 25¢ | 25% | +300 |
| 40¢ | 40% | +150 |
| 50¢ | 50% | even |
| 60¢ | 60% | −150 |
| 75¢ | 75% | −300 |
| 90¢ | 90% | −900 |
American odds shown for orientation if you are coming from a sportsbook. Prediction markets quote the price directly, which is why the middle column needs no arithmetic.
Why the two venues disagree
Kalshi and Polymarket are separate order books with separate participants, so the same question can carry different prices. A gap is not automatically free money. Three things eat it:
- The contracts may not settle the same way. Game markets settle on the official final score, including extra innings or overtime unless the rules say otherwise. Two markets with near-identical titles can still resolve on different sources, cutoffs or tie-breaks. We machine-check every cross-venue pair before calling it a match, and a pair our verifier rejects is not shown here as one market.
- The quoted price is the midpoint. What you can actually buy at is the ask, which on a thin book can sit well above the mid.
- Fees and capital. Both venues take a cut, and holding both legs to settlement ties money up until the event resolves.
Where a gap survives all three, that is what the edge scanner is for.
Common questions
- Are these live prices?
- Yes. Prices are re-read from both venues every few minutes. The 24h column compares against our own recorded price from a day earlier.
- Why do some rows show only one venue?
- Because only one venue lists that question. Kalshi and Polymarket carry substantially different catalogues — most markets exist on one and not the other.
- Do the outcomes in a race add up to 100%?
- Usually not exactly. Each outcome is its own contract with its own book, so the sum drifts above or below 100 depending on where the spreads sit. A sum well above 100 is the market pricing in more certainty than the field can collectively deliver.
- Can I trade here?
- No. MarketMaster is read-only — we show the prices and the analysis, and you trade on the venue itself.