Sources
We rely on official platform documentation, regulators' publications and our own worked examples. Each article shows when it was last updated.
Calculators
Every calculator uses one shared, automatically tested set of formulas. Fee rates are only shown as verified once we have checked them against the platform's official fee page.
Country status
Countries are listed as Available, Restricted or Not verified. We only mark a country Available after checking it, and we show the date of the last check.
Corrections
When we find an error we fix it and update the date on the page.
How we keep pages up to date
Each article shows the date it was last reviewed. When Polymarket changes its fees, market rules or list of restricted countries, we review the affected guides, country pages and calculators and update them. Market data on the site is synced automatically from Polymarket's public data and labelled with the time of the last update.
Calculators use one shared set of tested formulas, so the odds converter, profit, expected value and Kelly calculators always agree with each other and with the examples in our guides.
Corrections
If you spot something outdated or wrong, we treat it as a priority: we check the source, correct the page and update its review date. We do not change content in exchange for payment.