Kalshi vs Polymarket vs DraftKings
Two prediction-market exchanges and a real sportsbook, side by side — and how to tell which one is offering the better price on the exact same outcome.
Most comparisons stop at Kalshi vs Polymarket. But the most interesting price gaps in 2026 open up against a venue nobody else puts on the same screen: DraftKings. With DraftKings Predictions live across dozens of states, the same question — “will this team win the title?”, “will the Fed cut?” — now trades on a CFTC exchange, a crypto-native prediction market, and a licensed sportsbook at once. They price it three different ways, and the differences are tradeable.
at a glance
| Kalshi | Polymarket | DraftKings | |
|---|---|---|---|
| What it is | CFTC-regulated US exchange (DCM) | Crypto-native prediction market | Licensed US sportsbook (+ Predictions) |
| Price = ? | Order-book price ≈ implied probability | Order-book price ≈ implied probability | Posted odds with built-in margin (vig) |
| Cost to trade | ~1% fee, tier-discounted | 0% trading fee; gas + bridge costs | No explicit fee — the vig is the cost |
| Settlement | USD bank, 1–3 business days | USDC on Polygon, ~minutes | Cash balance, instant to withdrawal limits |
| Strong on | US macro (CPI, Fed), weather, sports props | Politics, crypto, world events, culture | Game lines, player props, season futures |
| Resolution | Listed source per contract | UMA optimistic oracle (disputable) | Official league/book result |
the key difference: vig vs order book
Kalshi and Polymarket are exchanges: you trade against other users at an order-book price that, after fees, is a clean read on implied probability. DraftKings is a sportsbook: it posts odds with a built-in margin (the “vig” or “juice”), so the two sides of a market sum to more than 100%. That margin is how the book makes money — and it’s why a sportsbook line is often a worse price than the same outcome on an exchange.
The practical upshot: when DraftKings is slow to move after news, or its vig is unusually fat, the exchange price on Kalshi or Polymarket can be meaningfully better. Sharp bettors increasingly check the exchange before they take the book’s number.
which venue tends to be ahead
- Breaking sports news — Polymarket and Kalshi order books often reprice faster than a sportsbook resets its line, so the exchange can briefly offer the better number.
- US macro (CPI, Fed) — Kalshi is usually the sharpest; Polymarket can lag on US-specific data.
- Crypto & global politics— Polymarket’s crypto-native base tends to lead here.
- Game lines & props — DraftKings has the deepest coverage, but the vig means you should always compare its implied probability against the exchange equivalent before betting.
how to compare them on the same outcome
Convert everything to implied probability (a sportsbook’s decimal odds of 2.00 = 50%, an exchange YES at 52¢ = 52%), strip the vig from the book’s number, and subtract each venue’s real cost. Whatever’s left is the edge. That is exactly what Tellmarket does automatically — the edges page ranks where one venue is pricing an outcome better than the cross-venue consensus, after fees, across all three.