Google bans prediction market Chrome extensions from August 1
Google updated Chrome Web Store policies on July 1 to prohibit extensions that facilitate real-money prediction market trading, effective August 1. The policy change targets browser extensions serving as trading interfaces or on-ramps for platforms. Several sources note Polymarket and Kalshi as affected operators. Google Finance continues displaying prediction market data, creating tension with the ban. Google separately stopped allowing prediction market product ads in Michigan and New York.
The August 1 deadline strips away a critical user acquisition channel for prediction market platforms. Polymarket and Kalshi relied on browser extensions to reduce friction for retail traders; losing that on-ramp forces both toward mobile apps and direct web traffic, which convert more poorly. The parallel Senate bill targeting sports event contracts would compound the damage by removing the highest-volume contract category at the same moment distribution shrinks.
For Kalshi especially, the squeeze is acute: it is already burning legal budget across multiple state enforcement fights and cannot afford to lose retail flow while sports contracts hang in legislative limbo. The Google Finance data integration remains live, so traders can still see odds but no longer trade through Chrome, a half-open door that benefits nobody. Operators must now rebuild their front-end stack around app stores with stricter gatekeeping than Google ever imposed on extensions.