Macro-data contracts
CPI, jobs, Fed-decision, and GDP markets routinely see five- and six-figure notional flowing through them in the hours before release. Spreads are typically a single cent and resolution is unambiguous — the BLS or BEA print is the source of truth.
Weather and natural-disaster
Hurricane landfall, monthly high-temperature, and snowfall contracts have grown into a real category. NHC and NWS advisories settle them. Edge here goes to traders who actually read the forecast discussions, not the headlines.
Sports outcomes
Game winners, season-long awards, and tournament outcomes are now a flagship category. Unlike a sportsbook, you can sell your position before kickoff if your read changes.
Political and policy markets
Election winners, congressional control, and major-policy markets remain Kalshi's most-watched category. Liquidity is highest in the 6–12 months before resolution.
Categories to avoid for size
Hyper-specific markets (single-celebrity, single-show, niche-award) can have headline-grabbing odds but wafer-thin books. You can get filled but you cannot exit quickly.