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Kalshi and Polymarket news

Official changes only: fee pages, CFTC announcements, the Federal Register and court dockets. Sources are checked automatically at 5:00 and 16:00 Mexico City time.

Reviewed items were checked by 62% Chance. Automatic items come straight from the official source and have not been reviewed yet. Always read the source before acting.

Sources last checked: Nov 15, 2026, 05:07 (Mexico City)

Fees

  1. AutomaticPolymarket

    Polymarket US changed its fee schedule page

    Source: Automatic page check

    Detected automatically. Not yet reviewed: check the page for what changed.

  2. AutomaticPolymarket

    Polymarket US changed its fee schedule page

    Source: Automatic page check

    Detected automatically. Not yet reviewed: check the page for what changed.

  3. AutomaticPolymarket

    Polymarket US changed its fee schedule page

    Source: Automatic page check

    Detected automatically. Not yet reviewed: check the page for what changed.

  4. AutomaticPolymarket

    Polymarket US changed its fee schedule page

    Source: Automatic page check

    Detected automatically. Not yet reviewed: check the page for what changed.

  5. AutomaticPolymarket

    Polymarket US changed its fee schedule page

    Source: Automatic page check

    Detected automatically. Not yet reviewed: check the page for what changed.

  6. ReviewedPolymarket

    Polymarket US announced taker fees by 30-day volume: 0.095 under $10,000, down to 0.0695 at $250,000 or more; new accounts pay 0.0695 for 7 days

    Source: Polymarket US · Related page

    Its fee page still said the earlier schedule applies until the change goes live. Check the fee on your order screen.

  7. ReviewedPolymarket

    Polymarket US combo fees now use C × p × [0.0695 × (1 − p) + 0.085 × (1 − p)⁴]

    Source: Polymarket US · Related page

  8. AutomaticKalshi

    Rollout timing: Maker fees will be enabled at 5:00 AM ET on Thursday, August 20, after the maintenance window.

    Source: Kalshi API changelog

  9. AutomaticKalshi

    The formerly announced change adjusting maker and taker fees in the event a quoter matches against a recently placed resting order will proceed as scheduled at 11:59 PM ET on August 21.

    Source: Kalshi API changelog

  10. AutomaticKalshi

    Combo markets created after 11:59 PM ET on August 19, 2026 that are composed entirely of independent NFL components will have no maker fee.

    Source: Kalshi API changelog

  11. AutomaticKalshi

    If the quote is marked post-only, it will never take resting orders on the book or be subject to a taker fee: it will be automatically cancelled at the normal execution if it were to match with a resting order.

    Source: Kalshi API changelog

Courts and law

  1. ReviewedKalshi

    Arkansas's attorney general sued Kalshi under the state's deceptive trade practices law

    Source: DeFi Rate

  2. ReviewedKalshi

    A federal judge in California barred Kalshi's sports contracts on the lands of the tribes that sued, not across the state

    Source: DeFi Rate

  3. ReviewedKalshi

    The Ninth Circuit refused to rehear its Nevada ruling against Kalshi

    Source: DeFi Rate · Related page

  4. ReviewedKalshi and Polymarket

    The Second Circuit refused to block New York and Connecticut from enforcing their gambling laws against Kalshi while its appeals continue

    Source: DeFi Rate · Related page

  5. ReviewedKalshi

    The Supreme Court extended Kalshi's deadline to answer New Jersey's petition (No. 26-299) to December 7, 2026

    Source: Supreme Court docket

  6. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Motion to extend the time to file a response from November 9, 2026 to December 7, 2026, submitted to The Clerk.

    Source: Supreme Court docket

  7. ReviewedKalshi

    Utah prosecutors filed 14 criminal counts against Kalshi and its co-founders

    Source: DeFi Rate

  8. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Brief amicus curiae of National Football League filed.

    Source: Supreme Court docket

  9. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Brief amicus curiae of American Gaming Association filed.

    Source: Supreme Court docket

  10. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Brief amicus curiae of The Casino Association of New Jersey filed.

    Source: Supreme Court docket

  11. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Brief amicus curiae of Former Senator Christopher J. Dodd filed.

    Source: Supreme Court docket

  12. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Brief amici curiae of 145 Indian Tribes, et al. filed.

    Source: Supreme Court docket

  13. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Brief amicus curiae of Former CFTC Chairman Gary Gensler filed.

    Source: Supreme Court docket

  14. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Brief amici curiae of Stop Predatory Gambling, et al. filed.

    Source: Supreme Court docket

  15. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Brief amici curiae of Ohio, et al. filed.

    Source: Supreme Court docket

  16. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Brief amicus curiae of Cabazon Band of Cahuilla Indians filed.

    Source: Supreme Court docket

  17. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Brief amici curiae of The International Association of Gaming Regulators, et al. filed.

    Source: Supreme Court docket

  18. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Brief amicus curiae of The National Council of Legislators from Gaming States filed.

    Source: Supreme Court docket

  19. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Motion to extend the time to file a response is granted and the time is extended to and including November 9, 2026.

    Source: Supreme Court docket

  20. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Motion to extend the time to file a response from October 8, 2026 to November 9, 2026, submitted to The Clerk.

    Source: Supreme Court docket

  21. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Petition for a writ of certiorari filed. (Response due October 8, 2026)

    Source: Supreme Court docket

  22. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Application (25A1465) granted by Justice Alito extending the time to file until September 3, 2026.

    Source: Supreme Court docket

  23. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Application (25A1465) to extend further the time from August 4, 2026 to September 3, 2026, submitted to Justice Alito.

    Source: Supreme Court docket

  24. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Application (25A1465) granted by Justice Alito extending the time to file until August 4, 2026.

    Source: Supreme Court docket

  25. AutomaticKalshi

    Supreme Court, Flaherty v. KalshiEX (No. 26-299): Application (25A1465) to extend the time to file a petition for a writ of certiorari from July 5, 2026 to September 3, 2026, submitted to Justice Alito.

    Source: Supreme Court docket

Regulation

  1. AutomaticKalshi and Polymarket

    CFTC Files Lawsuit Against Arkansas as the Agency Defends its Federal Jurisdiction Over Prediction Markets

    Source: CFTC

  2. ReviewedKalshi and Polymarket

    The CFTC proposed adding sports, politics, culture and weather contracts to the definition of a swap; comments close November 18, 2026

    Source: Federal Register

  3. AutomaticKalshi and Polymarket

    Rule: Further Definition of “Swap” To Exclude Casino-Style Gambling Products

    Source: Federal Register

  4. AutomaticKalshi and Polymarket

    CFTC Orders Gabriel Perez to Pay $172,000 for Insider Trading of Mention Market Event Contracts

    Source: CFTC

  5. AutomaticKalshi and Polymarket

    Proposed Rule: Data Reporting Requirements for Certain Event Contracts

    Source: Federal Register

  6. AutomaticKalshi and Polymarket

    Proposed Rule: Joint Request for Comment on Further Definition of “Swap” and “Security-Based Swap” and on Alternative Compliance

    Source: Federal Register

  7. AutomaticKalshi and Polymarket

    Proposed Rule: Prediction Markets; Public Interest Determinations

    Source: Federal Register

  8. AutomaticKalshi and Polymarket

    Proposed Rule: Prediction Markets

    Source: Federal Register

  9. AutomaticKalshi and Polymarket

    Proposed Rule: Event Contracts; Withdrawal of Proposed Regulatory Action

    Source: Federal Register

Mexico

  1. ReviewedKalshi and Polymarket

    SEGOB's list of authorized betting websites (August 2026 edition) shows Caliente.mx as operating; Kalshi and Polymarket are not on it

    Source: SEGOB · Related page

Dates coming up and corrections to this site are on the updates page.