As of January 16, 2026, the landscape of global prediction markets has undergone a seismic shift. For years, the industry was a two-horse race between the offshore, crypto-native Polymarket and the U.S.-regulated, institutional-grade Kalshi. Today, the results are in: the "financialization of sports" has crowned a new king.

Driven by the explosive success of its new "Combos" feature—a peer-to-peer (P2P) alternative to traditional sports parlays—Kalshi has successfully migrated the vast majority of its liquidity into the sports arena. During the week ending January 11, 2026, a staggering 91.1% of Kalshi’s total notional volume was concentrated in sports-related contracts. This surge propelled the platform to a record-breaking $2 billion in weekly volume, officially overtaking Polymarket in total market dominance and signaling a permanent change in how the public "bets" on the games they watch.

The Market: What's Being Predicted

The core of this market movement is the transition from binary event contracts (such as "Will the Fed cut rates?") to complex, structured sports products. Kalshi's Combos feature allows traders to create custom multi-leg contracts—the functional equivalent of a parlay—but without a "house" taking the other side.

Instead of betting against a sportsbook like DraftKings (NASDAQ: DKNG) or Flutter Entertainment (NYSE: FLUT), users utilize a Request for Quote (RFQ) system. When a trader builds a Combo—for example, "Kansas City Chiefs to win + Patrick Mahomes over 275 passing yards"—the platform’s market makers, including institutional giants like Susquehanna International Group (SIG), provide a real-time price to take the "No" side.

As of mid-January 2026, Kalshi handles approximately 66.4% of all global trades in the prediction market sector. This dominance is most visible in NFL playoff markets, where liquidity has become so deep that five-figure trades move the needle less than they would on a traditional sportsbook’s spread. Unlike Polymarket, which remains heavily focused on international politics and crypto-economic events, Kalshi has successfully branded sports as a tradable asset class for the American retail investor.

Why Traders Are Betting

The migration to Kalshi is being driven by a fundamental desire for better pricing. Traditional sportsbooks bake in a "vigorish" (the house's cut), which can be particularly predatory on parlays, sometimes exceeding 15-20%. Because Kalshi operates as an exchange, the bid-ask spreads are determined by competition between market makers, often resulting in 5-10% better payouts for the "Yes" side than traditional books.

"We aren't betting; we're taking a position," says one prominent trader who moved $2 million from offshore accounts to Kalshi this season. "On a sportsbook, you’re limited by their risk tolerance. On Kalshi, if I find a counterparty willing to take my price, I can size up as much as the market will bear."

Another massive driver has been the deep integration with Robinhood Markets Inc. (NASDAQ: HOOD). By allowing users to trade sports contracts alongside their stocks and ETFs, Kalshi has tapped into a demographic of "financial-first" users. These traders treat an NFL quarterback's injury report with the same analytical rigor as an earnings call, using Kalshi’s peer-to-peer model to "hedge" their emotional or financial stakes in the game.

Broader Context and Implications

This trend represents the ultimate "financialization of sports." For decades, sports betting was culturally siloed as "gambling." In 2026, the lines have blurred beyond recognition. Kalshi's victory in the landmark KalshiEX LLC v. CFTC case in late 2024 paved the way for this. By successfully arguing that election and sports contracts are federally regulated financial instruments rather than "gaming," Kalshi gained a regulatory moat that Polymarket—currently facing renewed scrutiny from international regulators—simply cannot match.

However, the rapid growth has not been without friction. In early 2026, state regulators in Tennessee and Nevada challenged Kalshi’s operations, claiming they represent unlicensed sports wagering. Yet, federal courts have largely sided with Kalshi, noting that as a Designated Contract Market (DCM), Kalshi falls under federal preemption, effectively allowing it to bypass state-level gambling bans.

This legal status has enabled institutional liquidity to flood the market. For the first time, sports outcomes are being treated like the Consumer Price Index (CPI) or Fed interest rate decisions—data points that can be traded, hedged, and leveraged in a transparent, regulated environment.

What to Watch Next

As we move deeper into the 2026 NFL playoffs and look toward the FIFA World Cup, all eyes are on Kalshi's ability to maintain its 91% volume share. The market is currently pricing in a 74% probability that Kalshi will reach a $5 billion weekly volume milestone by the end of the year.

Key dates to monitor include:

• Super Bowl LX: Expected to be the largest single-event volume day in prediction market history.
• Supreme Court Rulings: Any potential appeal regarding state preemption could introduce volatility into how "Combos" are offered in certain jurisdictions.
• Expansion of Asset Classes: Rumors suggest Kalshi is preparing to launch "Macro Combos," allowing traders to link sports outcomes with economic data (e.g., "Chiefs win + Inflation falls below 2%").

Bottom Line

Kalshi’s pivot to "Combos" has done more than just increase its volume; it has fundamentally redefined the competitive landscape. By providing a peer-to-peer exchange for sports parlays, Kalshi has stripped away the "house edge" and replaced it with a transparent financial market.

The data from January 2026 is clear: the public prefers "trading" to "betting." With 91.1% of its volume now in sports and its weekly notional totals surpassing $2 billion, Kalshi has not just overtaken Polymarket—it has arguably become the most important financial exchange for the modern retail era. As sports continue to be treated as a tradable commodity, the era of the traditional bookie may be nearing its end.

This article is for informational purposes only and does not constitute financial or betting advice. Prediction market participation may be subject to legal restrictions in your jurisdiction.

PredictStreet focuses on covering the latest developments in prediction markets. Visit the PredictStreet website at https://www.predictstreet.ai/.