Tribal Split and CFTC Moves Define US Prediction Markets Week

Kalshi and a set of tribal partners launched consumer-facing prediction-market products the week of Oct. 3–9, 2026, while the Commodity Futures Trading Commission took formal steps to classify event contracts as swaps and carve out traditional sportsbook wagers. The same seven-day period brought a wave of Supreme Court amicus briefs, a high-profile tribal coalition pressing the court to hear New Jersey’s appeal, and strategic infrastructure moves from FanDuel, Polymarket, ProphetX and others.

Tribal split widens as Kalshi partnerships go live

Four tribal nations announced Kalshi-powered prediction-market products one day after the Cabazon Band of Cahuilla Indians filed an amicus brief urging the Supreme Court to hear New Jersey’s appeal. The newly partnered tribes argued that tribal sovereignty permits them to offer prediction markets as an economic opportunity. The Cabazon Band countered that federally regulated sports contracts threaten tribes’ sovereign authority over gaming on their lands.

The dispute intensified after the California Nations Indian Gaming Association called the California tribal partnerships “disappointing.” The Oklahoma Indian Gaming Association reiterated opposition and noted none of the tribes entering Kalshi arrangements are members of OIGA. The disagreement spread to Florida when the Seminole Tribe sued DraftKings, alleging that DraftKings’ Pick6 and prediction-market sports product infringe on the tribe’s exclusive sports-betting rights under its compact with the state. DraftKings maintains its prediction markets operate under federal commodities law.

On Oct. 8, a broad coalition of 130 federally recognised tribes and 15 tribal organisations filed an amicus brief asking the Supreme Court to take New Jersey’s case. The brief argues Kalshi’s sports contracts undermine tribal sovereignty and the Indian Gaming Regulatory Act.

Supreme Court docket swells with briefs from states, leagues and ex-regulators

Thirty-nine states and the District of Columbia joined the National Football League in urging the Supreme Court to review New Jersey’s appeal, pointing to conflicting federal circuit rulings over whether sports contracts are swaps subject to CFTC oversight. The NFL emphasised concerns about game integrity, insider trading and consumer protections.

Additional briefs supporting Supreme Court review arrived from former Commodity Futures Trading Commission Chairman Gary Gensler, former Senator Christopher Dodd and the American Gaming Association. Gensler argued sports bets are not swaps, and Dodd said the Dodd-Frank Act was not intended to make the CFTC a national sports-gambling regulator. These filings followed an Illinois district judge’s ruling that Kalshi’s core sports contracts likely qualify as swaps, adding to a fractured federal landscape: the Third Circuit has sided with Kalshi on swap status, while the Sixth and Ninth circuits have rejected that view. Kalshi’s response to New Jersey’s Supreme Court petition is due Nov. 9.

CFTC proposes defining swaps and handling in-house market makers

On Oct. 8 the CFTC issued two linked actions intended to clarify where event contracts sit in US law. The agency proposed explicitly classifying sports and other event contracts as swaps, and simultaneously adopted an interim final rule that excludes traditional casino gambling and sportsbook wagers from that swap definition. The moves aim to draw a statutory line between federally regulated event contracts and gambling products overseen by states and tribes.

The agency also solicited input on how exchanges should manage conflicts when affiliated firms trade on their own platforms, with industry comments ranging from proposals for an outright ban on affiliate trading to calls for allowing in-house market makers to compete on the same terms as independent firms.

At the same time the CFTC is preparing rulemaking that could reach certain retail crypto transactions and has cleared a faster approval route for true stock-index perpetual futures—products prediction-market operators have begun to explore. Observers have questioned whether the agency has sufficient staff to manage an expanding remit: the CFTC inspector general delayed an enforcement review and narrowed a staffing evaluation, and the Government Accountability Office is preparing its own inquiry into workforce reductions.

See the regulatory thread on this in our /regulation coverage.

Exchange product and infrastructure moves: FanDuel, Polymarket, ProphetX and more

FanDuel secured registration for a standalone futures commission merchant, giving FanDuel Predicts a wholly controlled vehicle after previously operating through an FCM jointly owned with CME. FanDuel moved sports and other non-financial contracts from CME to Crypto.com in August; CME has since distanced itself from sports prediction markets.

Polymarket began rolling out Protocol V2, a rebuild of its smart-contract infrastructure that entered production testing on Oct. 5 with new markets tentatively migrating on Nov. 2. ProphetX expanded non-sports offerings, self-certifying markets tied to monthly trading volume on Polymarket US, Rothera and DKeX, and added volume contracts referencing Novig and Underdog. Blockchain.com applied to become a CFTC-designated contract market to offer prediction markets and crypto derivatives to US customers.

EDGE Markets released infrastructure allowing institutions to set capital and permission limits for trading algorithms and AI agents, and ThinkEquity signed a deal with Arqitech to build a broader platform that could integrate stocks, bonds, crypto, tokenised assets and prediction markets, subject to approvals.

For platform strategy and supplier implications see our analysis in /b2b.

Competition for customers: pricing edges, affiliates and endorsements

Citizens JMP analysis found Kalshi regained a pricing edge over FanDuel and DraftKings on NFL single-game moneylines and totals in Week 4, showing lower average implied vig in the samples it examined. The advantage did not extend to combo markets, where Kalshi remained more expensive.

Search data supplied exclusively to NEXTPredict showed US demand for prediction markets roughly matched traditional online sportsbooks and casinos in the first seven months of 2026, with prediction-market demand more than quadrupling year-over-year while traditional iGaming demand fell 5.6%.

Wall Street is taking note: Bank of America upgraded DraftKings to “Buy” in part because of its prediction-market opportunity, ranking DraftKings as the No. 3 player behind Kalshi and Polymarket. Affiliate networks Catena Media and Better Collective told NEXTPredict they view prediction markets as a developing affiliate vertical, although current customer-acquisition payments trail those for sportsbooks and casinos.

Kalshi also secured a mainstream athlete endorsement when Ronald Acuña Jr. signed with the exchange, becoming the first active MLB player to endorse a prediction-market operator.

Election and macro markets: prices, transparency tools and volume

Prediction markets moved decisively in Brazil after the first round of the presidential contest, with Kalshi and Polymarket giving Flávio Bolsonaro a commanding chance of winning the Oct. 25 runoff even as polls showed a closer race. The contrast highlighted differences between market probability of victory and poll vote-share estimates.

Kalshi added transparency features to its 2026 midterm markets as political trading volume reached roughly $844m, introducing Brier scores, low-volume labels and more prominent trade feeds to help users interpret forecasts.

What to watch next week

Federal litigation calendars include a Rule 16 pretrial conference in the consolidated challenges to Minnesota’s prediction-market ban, a Ninth Circuit remand update in Blue Lake Rancheria v. Kalshi, and a motion hearing in Lavery v. Kalshi in the Northern District of Illinois. Ohio and Missouri regulatory deadlines for cease-and-desist responses fall on Oct. 16–17 after recent letters targeting multiple exchanges and broker-dealers.

Trading events this week include MLB and NFL critical fixtures priced across exchanges, Euro and UK rates data ahead of central bank meetings, and Polymarket’s interest-rate markets assigning high probabilities to various Fed and Bank of England outcomes.

"Kalshi’s sports contracts raise fundamental questions about tribal sovereignty and federal oversight," said one tribal coalition in its Supreme Court filing, arguing for review. — Coalition brief

"The CFTC’s proposed rule will draw a statutory line between event contracts and traditional gambling," the agency stated in its Oct. 8 release. — CFTC action