Google's Chrome store ban on prediction market extensions takes effect
From 1 August the Chrome Web Store refuses extensions that move real money on predictive outcomes, closing a distribution channel to venues such as Kalshi and Polymarket. Google Finance has carried their prices since November 2025.
What happened
Google's updated Chrome Web Store Developer Program policies came into force on 1 August. The Regulated Goods and Services section now states: 'Extensions that facilitate or enable real money transactions on predictive outcomes are not allowed.' Google published the change on 1 July 2026, in a post titled 'Chrome Web Store policy updates: Enhancing user privacy and platform integrity', alongside revisions to data-use and disclosure rules, and said extensions found non-compliant after 1 August may face enforcement action including removal from the store. The policy names no venue. Reporting has read it against Kalshi and Polymarket, whose markets remain reachable through their own websites and apps.
Why it matters
Every constraint on prediction markets this desk has covered arrived through a court or a regulator: New York sued Kalshi on 31 July, the CFTC ordered a penalty against an individual trader the same day, and the Commission is writing public-interest rules for event contracts. A browser store policy is different in kind. Google is not a regulator and owes no process to the venues whose tooling it delists. It controls a distribution channel most desktop users pass through, and it can change the terms of that channel in a blog post. For markets whose economics rest on retail order flow, private gatekeeping can bind sooner than any rulemaking, and it binds without a comment period or a right of appeal. Google's own position is not consistent, a point Gaming America sets out: Google Finance has carried Kalshi and Polymarket data inside its stock and financial data interface since November 2025. The same company declines to distribute the tooling and publishes the odds.
What is not settled
No report confirms that any extension has been removed. Three days after the policy took effect the coverage is still the July announcement, and neither Google nor either venue has said what has changed in the store. The policy's reach is untested: the wording captures tools that execute real money transactions, but Google has not said whether trackers and odds displays that only link out to a venue fall within it. Reports also render the policy text differently—BeInCrypto quotes 'real-money trades on predictive outcomes' where the published policy says 'real money transactions on predictive outcomes'—and the policy page wording governs.
Institutions in this story
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Kalshi
Exchange
Loses store distribution for third-party Chrome tooling in the same week that New York sued it as an unlicensed gambling operation and the CFTC ordered a penalty over one of its contracts. The exchange itself is untouched: the policy reaches extensions, not venues.
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Polymarket
Exchange
Named alongside Kalshi in reporting on the policy, though Google names no venue. Google Finance has carried Polymarket data inside its stock and financial data interface since November 2025, so the same company now refuses the tooling and publishes the prices.
On the record
Google's Chrome Web Store ban on prediction market extensions takes effect
Google's revised Chrome Web Store Developer Program policies came into force on 1 August 2026, the Regulated Goods and Services section stating that extensions facilitating or enabling real money transactions on predictive outcomes are not allowed. The change was published on 1 July. It names no venue and reaches extensions rather than the markets themselves; no removal has been reported.