Market Grades by Belief Systems

Independent A+ to F quality grades for prediction markets, based on liquidity and integrity, beside each graded market.

A market's price tells you what its participants expect. A Market Grade tells you something different: how good the market behind that price is. Market Grades by Belief Systems shows independent quality grades, A+ to F, beside graded markets on polymarket.com. Each grade rates the market's liquidity and integrity, not the likelihood of any outcome. Free, with no account or sign-in. WHAT A GRADE MEASURES • Liquidity: how easy it’s been to buy or sell near the price. • Integrity: how many participants took part, and whether the book stayed two-sided. A screen, not proof against manipulation. WHAT YOU SEE • The grade beside the market title, from Belief Systems. • Hover, click, or tap it for a short card: what the letter means, how much market activity backs it, and when it was last checked. • Quality chips on market cards as you browse and search. • On events with many outcomes, a count of graded outcomes, each one a click away. • “No grade” when a market has none, with the reason. No grade is no opinion, not a low grade. • A link from every grade to its full public record on beliefsystems.xyz. YOUR CONTROLS • Show liquidity and integrity next to the letter. • Hide grades on a site in one click. • Turn usage data off in settings. PRIVACY • To find grades, it reads the page address and the market links on the page. It sends those market IDs to beliefsystems.xyz, and looks the markets up on Polymarket’s public API from your browser. • It never reads or sends your balance, positions, or orders, and it skips your portfolio and profile pages. It never places, changes, or blocks an order, and never changes the page’s prices, markets, or their order. • “Share usage data” (on by default) sends counts like “a grade was shown,” tied to a random install ID. Usage data never includes market names, IDs, or page addresses. Turn it off in settings. ABOUT MARKET GRADES Grades are checked daily from public market data. They cover a selected set of longer-running markets, so many markets show “No grade.” Market Grades are in beta. Market Grades measure market quality – liquidity, integrity – not the likelihood of any outcome. Market Grades are unsolicited: no graded party requests, pays for, or previews a grade. Belief Systems holds no positions in graded markets. A grade is not a recommendation to buy, sell, or hold any position, and is not a substitute for a user’s own assessment. Belief Systems is not affiliated with or endorsed by Polymarket. All grades: https://www.beliefsystems.xyz/grades How grades work: https://docs.beliefsystems.xyz/grades/methodology Privacy: https://www.beliefsystems.xyz/privacy#extension