Sports prediction markets turn traditional sports betting into binary contracts traded between $0.01 and $0.99, regulated by the U.S. CFTC and dominated in 2026 by Kalshi and Polymarket. These platforms let users trade the probability of a sports outcome — game wins, player props, season futures — with rising liquidity and geographic reach that keeps expanding despite ongoing litigation in fifteen U.S. states.
🔑 Key Takeaways
- Binary contracts trade between $0.01 and $0.99 and represent the market-implied probability of the event.
- Kalshi, CFTC-regulated, is live in 48 states and holds a 4.8★ App Store rating with 385,000 reviews.
- Polymarket runs on Polygon with USDC, covers 49 states, and pays out $50,000 daily through its Combo Cup.
- Nevada and Minnesota ban these markets; 15 additional states were in active litigation as of June 2026.
- Starting in tax year 2026, only 90% of sports betting losses will remain deductible.
How Prediction Markets Work — and Who Regulates Them
A sports prediction market offers binary yes/no contracts whose price reflects the participants’ aggregated probability estimate. When a « yes » contract trades at $0.93, the market prices the event at 93% likelihood. At settlement, every share in the winning side pays $1; losing shares expire worthless. The mechanics turn a classic sports bet into a financial instrument closer to a binary option than to a wager with a bookmaker.
In the United States, these platforms have fallen under the Commodity Futures Trading Commission (CFTC)‘s jurisdiction since 2024, classified as event-based futures contracts. The classification imposes strict compliance standards: anti-money-laundering controls, position caps, KYC verification, and a hard ban on minors. Any geographic expansion therefore requires prior federal designation.
Kalshi and Polymarket: The Top of the Stack
As of August 2026, Kalshi — launched July 2021 — and Polymarket — founded in 2020 — capture the bulk of sports volume. Kalshi leans on a centralized limit order book (CLOB), deep liquidity on major leagues, and a built-in parlay builder. Polymarket relies on the Polygon blockchain and the USDC stablecoin, with a hybrid order book matched off-chain and settled on-chain through the UMA optimistic oracle, which resolves 99.8% of disputes without escalation.
| Feature | Kalshi | Polymarket |
|---|---|---|
| Launched | July 2021 | 2020 |
| Infrastructure | Centralized (CLOB) | Polygon + USDC (hybrid) |
| U.S. states | 48 (excl. NV, WA) | 49 (excl. NV) |
| Fee on profits | 2% (capped at 10%) | up to 0.75% on sport |
| App Store rating | 4.8★ (385K reviews) | 4.6★ (52K reviews) |
| Max combos | multiple parlays | up to 32 outcomes |
| Welcome bonus | $20 for $10 deposit | $20 for $10 deposit |
« Kalshi beats Polymarket for me as the best prediction market app, in part thanks to its welcome offer with much higher earning potential. Kalshi’s experience is cleaner and less overwhelming, with readable trading slips and the most complete player-prop parlay builder. »
Geoff Ulrich, prediction markets analyst at Sports Illustrated
Polymarket counters with unmatched catalog depth — sports, politics, crypto, finance, culture — plus the Combo Cup, paying $50,000 a day to the top combination traders. The platform also acquired QCEX, a licensed derivatives exchange, to relaunch its U.S. operations after a 2022 CFTC-ordered shutdown.
The Challenger Tier: Novig, ProphetX, OG and DraftKings
Behind the leading duo, a handful of operators compete for state coverage and low-fee positioning.
- Novig: peer-to-peer model with no « vig » (bookmaker commission), live in 47 states across NFL, NBA, UFC, NHL, MLB and soccer; $50 bonus for a $10 deposit.
- ProphetX: sportsbook-style UI with American odds; 2% on net gains, 0% on parlays.
- OG: launched February 2026 by Crypto.com, available in 40+ states, social features (leaderboards, posts), bonus up to $100.
- DraftKings Predictions: up to $150 in non-withdrawable prediction dollars on a first $5 trade.
- FanDuel Predicts: launched December 2025 with CME Group, targeting states without legal sportsbooks.
These operators share a common denominator: monetizing bettor impatience through micro-fees and acquisition bonuses in a market where traditional bookmaker margins (4%–8%) remain the main push factor pushing users toward exchange-style structures.
Legal and Tax Headwinds
The legal status of prediction markets remains a federal mosaic. In October 2024, Kalshi secured an injunction against the CFTC allowing it to keep operating — widely read as a sector-wide green light. The CFTC officially dropped its case in May 2025. Polymarket, blocked since 2022, regained full U.S. user access in May 2026 after the Trump administration declined to pursue charges.
At the state level, the picture stays fragmented. Nevada and Minnesota ban these markets — bans now contested in court by the federal government and operators. By June 2026, 15 additional states were locked in active litigation against prediction market operators.
Taxation: The 2026 Turning Point
Regulated venues like PredictIt and Kalshi issue 1099-MISC forms reporting annual net winnings as ordinary income. The One Big Beautiful Bill Act (OBBBA), signed by President Trump on July 4, 2025, narrows loss deductibility from tax year 2026 onward: bettors will only be able to deduct 90% of losses on unsuccessful wagers — a provision that eats into the after-tax efficiency of high-volume strategies.
Outlook: An Industry Maturing Fast
Institutional acceptance is accelerating: Crypto.com bought Nadex (formerly HedgeStreet, the first CFTC-approved prediction market in 2004) in 2021, and CME Group has aligned with FanDuel. Economists Paul Rhode and Koleman Strumpf estimate that per U.S. presidential election, prediction-market volume exceeds 50% of campaign spending — a liquidity benchmark that sports operators now chase every NFL Sunday.
For users, the takeaway is blunt: academic research on Kalshi shows contracts priced ≤ $0.10 have lost on average more than 60%, while those priced above $0.50 have generated positive returns. With roughly $40 million of arbitrage captured on Polymarket, the gap between professional and casual traders — not the welcome bonus — remains the dominant driver of profitability.
Sources
- CryptoSlate — Sports Prediction Markets
- Sports Illustrated — Prediction Markets USA Apps
- NerdWallet — What Are Prediction Markets
- Wikipedia — Prediction Market
- Mile High Sports — Prediction Markets
- Sportsbook Review — Sports Prediction Betting Sites
This article is for informational and educational purposes only. It does not constitute investment advice. Do your own research (DYOR) before making any decisions.
