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Available on all plans (Free tier included).
Search covers three things: finding a series (a recurring or related group of events), finding markets and events inside one, and tailing recent listings. Most workflows that feed into the historical endpoints start with Search series.

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Common workflows

Backtest a strategy on a series

Find the series you want, then list its closed markets in a time window. Feed the resulting market_id values into the Kalshi or Polymarket historical endpoints.

Build a probability dashboard

Scope to a series (e.g. one NBA market type or one Kalshi BTC resolution), pull active events, then poll their orderbooks.

Free-text discovery

Don’t know a series_id yet? Search markets or events directly with q=. Useful for one-offs and cross-series queries.

Watch new listings

Tail the most recent listings on either exchange, or watermark a search by discovered_after to poll for new entries within a series.

See an event's outcomes

Once you have an event_id, list every outcome market under it.