Election prediction markets: where to trade and why
Published 2026-05-22 · Last reviewed 2026-07-03
TL;DR
- Election prediction markets price the probability of political outcomes using real-money trading.
- Kalshi (US-legal), Polymarket (non-US), and PredictIt (US-legal, capped) are the major venues.
- Prices typically — but not always — outperform polls and pundits as forecasts.
Election Twitter is loud. Election markets are louder — real money on the line, and they moved faster than every poll in 2024.
What are election prediction markets?
Election prediction markets are exchange-traded contracts that pay $1 if a defined political outcome happens and $0 if it doesn't. The market price equals the implied probability of YES. A "Will Democrats hold the Senate?" contract trading at 41¢ means the market believes there's a ~41% probability.
Where to trade them
- Kalshi. CFTC-regulated; accepts US users. Lists party-control contracts and individual races at scale. Standard 1–7% trading fees.
- Polymarket. On-chain venue with the deepest election volume globally. 0% trading fees. Blocks US users under its terms.
- PredictIt. US-legal under an academic CFTC no-action letter. $850-per-market cap. Best long-running political coverage.
- Manifold. Play-money. Excellent for testing your calibration; not real exposure.
How accurate are they?
The academic consensus: in the final weeks of a closely-watched race, prediction-market prices generally outperform polls and most pundit forecasts. The mechanism is simple — traders who think prices are wrong put real money behind their view, which moves prices toward the better-informed estimate.
Caveats: thin markets are manipulable, and markets occasionally reflect the bias of their userbase rather than the true probability. The 2024 cycle produced several well-documented examples in both directions.
How to read an election market
Three numbers matter: last price (the most recent trade), the bid-ask spread (how confident the market is — narrow spread means consensus, wide spread means uncertainty), and volume (how much real money is behind the price).
A 65¢ contract with a 1¢ spread on $500k of volume is a meaningful signal. The same 65¢ on $500 of volume is barely an opinion.
Election markets vs polls
Polls measure stated preference; markets aggregate beliefs about outcomes, including conditional logic ("if turnout is high, then..."). The two complement each other — polls inform markets, and savvy market readers correct for known poll biases.
Related
Sources & further reading
- Event Contracts — CFTC overviewU.S. Commodity Futures Trading Commission (CFTC)
- Kalshi — official siteKalshi
Frequently asked questions
Where can I trade US election prediction markets?
In the US: Kalshi (CFTC-regulated, broad election contracts) and PredictIt (academic exemption, $850/market cap). Outside the US: Polymarket has the deepest election market depth by volume.
Are election prediction markets accurate?
Generally more accurate than polls in the final weeks of a race, but they're not infallible. Markets aggregate public information; they're vulnerable to manipulation in thin markets and to herd behavior in thick ones.
Can I trade the 2026 midterms on a prediction market?
Yes. Kalshi and Polymarket both list contracts on individual Senate and House races, party control of each chamber, and national vote share. Kalshi has more US-listed contracts; Polymarket has higher overall volume.
How does the implied probability work?
Each contract pays $1 if YES and $0 if NO. A contract trading at 62¢ means the market's implied probability of YES is roughly 62% (minus a small spread). Sum of YES and NO prices is approximately $1.
What's the difference between Kalshi and Polymarket for elections?
Kalshi is CFTC-regulated and accepts US users; Polymarket has deeper election volume and more granular contracts but blocks US IPs. For active US traders, Kalshi is the practical choice.
Related reading
Independent coverage. Some outbound links are affiliate links — see footer disclosure.