SPORTS PREDICTION MARKETS: THE COMPLETE 2026 GUIDE
How sports prediction markets work, what trading them actually costs, and where to trade them legally in the US.
Kalshi · Trade $25 and Get $25!
WINPREDICTSClaim21+ · T&Cs apply
Certain limitations apply. The offer is available to new users only, subject to the terms and conditions at kalshi.com/tc/500. 18+ only. Restrictions and eligibility requirements apply. Event contract trading involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. Kalshi products are not available in all jurisdictions. See kalshi.com/regulatory for more information.
Kalshi · Trade $25 and Get $25!
WINPREDICTS
Certain limitations apply. The offer is available to new users only, subject to the terms and conditions at kalshi.com/tc/500. 18+ only. Restrictions and eligibility requirements apply. Event contract trading involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. Kalshi products are not available in all jurisdictions. See kalshi.com/regulatory for more information.
Last checked October 14, 2026
What is a sports prediction market?
An exchange where users trade YES/NO contracts on sports outcomes — game winners, totals, championships, awards — against each other rather than against a house. Each contract pays $1 if the outcome happens, $0 if not.
TL;DR:
Sports prediction markets let you trade sides, totals, and awards as YES/NO contracts on a federally regulated exchange. Prices are quoted in cents of implied probability with no house margin, profits are taxable (though the IRS hasn't yet said exactly how), and the venues are open in most US states. Polymarket, Kalshi, and Rebet lead in the US.
What is a sports prediction market?
A sports prediction market is an exchange where you trade a YES/NO contract on a sporting outcome against other users rather than against a house. Each contract pays $1 if the outcome happens, $0 if it doesn't, and the price in cents is the market's implied probability.
Polymarket: deposit $10, get a $25 trading bonus with code WIN
18+ Only. Restrictions and eligibility requirements apply. Not available in all jurisdictions. Trading is risky. 100% loss can occur. See polymarket.com/tos for more information. The Polymarket US App serves as an independent software provider and affiliate of Polymarket US and Polymarket Clearing, the CFTC-regulated exchange and clearing organization.
How exchange pricing works
A true coin flip trades around $0.49 / $0.51 on a prediction market: no house sets the line, so the only cost embedded in the price is the spread between the best bid and the best ask — typically about 1% on liquid contracts. Over hundreds of trades that cost is what separates a small profit from a small loss.
No house margin. Just the spread.
Where to trade sports prediction markets in the US
Three venues lead: Kalshi (CFTC-regulated, USD, 47 states + DC), Polymarket (CFTC-licensed, US app, 49 states + DC), and Rebet (mobile sweepstakes, 38 states + DC).
- Kalshi — deepest US books on NFL, NBA, MLB sides and totals
- Polymarket — best for global sports, World Cup, Champions League, MMA
- Rebet — mobile-first, sports-heavy, sweepstakes model
What kinds of sports markets are available?
Game winners, totals, season-long awards (MVP, Cy Young, Heisman), conference/division winners, championship futures, and increasingly some prop-style markets. Live in-game markets are still limited — exchange order books reprice more slowly during play.
Tax treatment
The IRS hasn't issued guidance on how profits from CFTC-regulated venues are taxed — gambling income, capital gains and Section 1256 treatment are all argued — so keep records and see our prediction markets tax guide and our are prediction markets gambling explainer for the full breakdown.
Where prediction markets fall short for sports
Three weaknesses: (1) live in-game order books reprice slowly; (2) prop depth is thinner; (3) parlay-style combo entries aren't natively supported — Rebet's social app is the closest thing to that format among the venues we cover.
Sources & references
Frequently asked questions
What is a sports prediction market?
An exchange where users trade YES/NO contracts on sports outcomes — game winners, totals, championships, awards — against each other rather than against a house. Each contract pays $1 if the outcome happens, $0 if not.
What does it cost to trade a sports prediction market?
Only the bid-ask spread plus the venue's fee — roughly 0.5–1% in spread on liquid Polymarket contracts, and a small per-contract fee on Kalshi. There is no house margin built into the quoted price.
Where can I trade sports prediction markets in the US?
Kalshi (USD via ACH, 47 states + DC), Polymarket (US app, 49 states + DC), and Rebet (sweepstakes app, 38 states + DC) are the three main US-legal venues.
Can I trade live in-game sports markets on prediction exchanges?
Only in a limited way. Order books reprice more slowly once a game is under way, so live markets are thinner and spreads widen. Most volume sits on pre-game and season-long contracts.
Are sports prediction market winnings taxed as gambling?
Possibly — nobody knows for certain yet. The IRS hasn't issued guidance on event contracts, and tax professionals variously treat profits on Kalshi and Polymarket as gambling income, capital gains or Section 1256 contracts. Profits are taxable either way; keep records and ask a tax professional.
21+ · T&Cs apply · Terms
Certain limitations apply. The offer is available to new users only, subject to the terms and conditions at kalshi.com/tc/500. 18+ only. Restrictions and eligibility requirements apply. Event contract trading involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. Kalshi products are not available in all jurisdictions. See kalshi.com/regulatory for more information.
