Every market is a yes/no question with a deadline — an election, a Fed decision, a bill becoming law. Trades match between users rather than against a house, which makes the venue structurally an exchange, not a sportsbook, and the price a live poll weighted by conviction: traders who are wrong lose money to traders who are right, so prices absorb news in minutes. Polymarket, the largest, settles its international markets in stablecoins on a
blockchain; its US arm and rival Kalshi operate as CFTC-regulated exchanges.
Bitcoiners watch them because the questions that move bitcoin sideways — legislation, rate decisions, elections — trade continuously there. When
the CLARITY Act's odds halved while sponsors kept promising a vote, the market was pricing information the press releases weren't carrying. The caveats: thin contracts get noisy, most volume sits in sports, and an odds print is a snapshot of current information, not a verdict.
Our full explainer covers the mechanics and Polymarket's banned-to-regulated arc.