// GLOSSARY

Event market

A market (or group of markets) tied to a real-world event — an election, a Fed meeting, a game. On Kalshi, an event groups related binary markets under one umbrella; Polymarket similarly groups outcome markets under an event page.

"Event market" is used loosely for any contract on a real-world occurrence, but on both major venues it also has a structural meaning: the event is the grouping level between a recurring series and an individual tradable market.

The hierarchy

On Kalshi: series (the recurring question, e.g. monthly CPI) → event (one instance, e.g. the July print) → markets (the individual binary strikes, e.g. "CPI above 3.0%"). Each level has its own ticker. Polymarket has an analogous shape: an event page groups related markets, each with its own condition ID.

Why the structure matters for APIs

Discovery usually starts at the event level ("what's listed on the July Fed meeting?") and drills into markets. Filtering by event or series is far more efficient than paging every open market — patterns covered in the prediction market API guide. It's also the natural unit for cross-venue mapping: the same real-world event backs different market structures on each venue.