The one-page prediction market cheat sheet

Fee formulas for Kalshi and Polymarket with worked numbers, a price-to-odds table, and the checklist we run before any trade. Free PDF.

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What's inside

Kalshi and Polymarket fee formulas, with a table at 10¢, 25¢ and 50¢
Price to implied probability, American and decimal odds
Break-even math after fees
Pre-trade checklist: state eligibility, resolution source, spread, depth, settlement date