Sports event contracts

Best Prediction Markets for Sports in 2026

Sports event contracts are the fastest-growing category in prediction markets. These platforms offer the deepest order books, the widest event coverage, and clear answers about where they fit alongside traditional sportsbooks.

Top picks for sports

Kalshi sports contracts

Kalshi expanded into sports event contracts in 2025 after a CFTC interpretive ruling clarified that certain sports outcomes qualify as listable event contracts. The platform now offers Super Bowl winners, NBA Finals matchups, World Series outcomes, season win totals for major teams, and milestone contracts (will any pitcher throw a perfect game this season).

For US residents, Kalshi is the cleanest legal framework for sports prediction trading. It sits inside CFTC regulation, accepts USD funding, and reports income on standard tax forms. The order books are not yet as deep as a dedicated sportsbook on individual game spreads, but for season-long and tournament-winner contracts, liquidity is solid and growing.

Polymarket world sports

Polymarket runs the deepest order books for international sports. World Cup contracts on Polymarket routinely cross the equivalent of $50 million in volume. Champions League knockout rounds, the Olympics, ICC Cricket events, and major tennis grand slams all attract real liquidity.

For US sports specifically, Polymarket has been less of a focus, partly because of geo-restrictions on US users. For an international trader who wants global event coverage in one place, Polymarket is usually the first stop.

Smarkets exchange

Smarkets is a UK and EU regulated betting exchange. Strictly speaking it is not a prediction market in the CFTC sense, but it operates on the same peer-to-peer order book model. Commissions are 2 percent on net winnings rather than the 5 percent vigorish baked into most sportsbook lines, which makes a meaningful difference for active traders.

Football and tennis are the deepest categories. US sports coverage is thinner. The platform is unavailable to US residents.

How prediction markets differ from sportsbooks

A traditional sportsbook quotes a line and acts as the counterparty. The book sets the price, the book takes the other side, and the book builds a margin into the odds. Win or lose, the book wants the volume balanced.

A prediction market is peer to peer. You trade against another user, not the platform. Prices reflect what other traders are willing to pay rather than a bookmaker’s line. Fees are commission-based on the trade itself, not embedded in worse-than-fair odds.

For casual single-game wagers, sportsbooks are usually faster and more convenient. For season-long positions, complex tournament contracts, and traders who want to enter and exit positions over time, prediction markets give you more flexibility and often better effective pricing.

Dedicated US sports exchanges

Kalshi and Polymarket dominate prediction market headlines, but a cluster of US sports-focused exchange platforms has built real traction with sharp bettors. These operate under state sports betting licenses rather than federal event contract rules, which means they are only live in a subset of states but can offer deeper sports-specific liquidity than the general-purpose prediction markets. Each is peer-to-peer, none take a traditional vig on matched bets, and none limit winning accounts.

How these differ from Kalshi’s sports contracts: Kalshi’s sports event contracts run under federal CFTC authority and are available to anyone in the US. Novig, ProphetX, and Sporttrade run under state sports betting licenses and are only available where they are licensed. Betfair Exchange is UK-regulated and not available to US residents. All four exchanges price markets peer-to-peer; Kalshi does too.

More sports platforms worth knowing

Beyond Novig, ProphetX, Sporttrade, and Betfair Exchange, a few more sports platforms round out the category:

• Matchbook (4.3/5) – UK sports exchange with flat 2% commission and no Premium Charge. The professional’s alternative to Betfair in the UK/IE markets. Not available to US residents.
• SX Bet (4.2/5) – The leading decentralized sports betting exchange by matched volume. Runs on SX Network, a purpose-built EVM chain. Self-custody, no winner limiting. Not available to US residents.
• Pinnacle (4.6/5) – Not a prediction market or exchange, but a sportsbook whose closing lines are the de facto efficient-price reference for sports trading globally. Included here as context. Not US-accessible.

Frequently asked questions

Is Kalshi a sportsbook?

No. Kalshi is a CFTC-regulated derivatives exchange that lists certain sports outcomes as event contracts. It is not licensed as a sportsbook in any US state, and it does not offer point spread, money line, or in-game betting in the traditional sportsbook sense.

Can I trade NFL games on Polymarket?

Polymarket lists some NFL contracts, primarily Super Bowl and conference winner markets. Single-game NFL spreads are not a core focus. Liquidity is much deeper for international football (soccer) tournaments.

Which platform has the lowest sports fees?

Smarkets at 2 percent commission on net winnings is structurally one of the cheapest. Kalshi’s fee scale tops out around 7 percent of profit. Polymarket charges 2 percent of trade size. Effective cost depends on win rate and trade size.

Can US residents use Smarkets?

No. Smarkets is licensed in the UK and Malta and is unavailable to US residents.

Are sports prediction market wins taxable?

Yes. In the US, profits from CFTC-regulated event contracts are typically reported as 1099 income or as commodity gains depending on broker. International rules vary. This is not tax advice.

PredictWire may earn a commission when you sign up for a platform through links on this page. Ratings and rankings are independently determined and not influenced by compensation. Prediction markets carry financial risk; only trade with funds you can afford to lose.