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An event series is a collection of recurring events that follow the same pattern — same asset, same question structure, repeated on a schedule. Instead of a one-off “Will BTC close above $70k?”, a series produces a new event every hour, every 6 hours, or every day.

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How series work

Each series defines:
  • Asset — the underlying asset or topic (e.g. BTC, ETH, XAUUSD, EUR/USD).
  • Interval — how often a new event is created: FIFTEEN_MINUTE, HOURLY, SIX_HOURLY, or DAILY.
  • Category — such as CRYPTO, CURRENCY, or FINANCE.
When a series interval elapses, a new event is automatically created with its own markets and outcomes. Previous events in the series continue through their normal lifecycle (trading closes, then the outcome is resolved).

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Series vs events

A series is not tradeable on its own. It groups events so you can browse and follow a specific asset’s recurring markets.

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Available series

Use the assetSymbol and intervalType fields to find the series you need rather than relying on category alone.

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Browsing series

Use the List series endpoint to get all available series:
Each series has a slug (e.g. crypto-btc-1h) that you use to fetch its recent events:
This returns up to 20 recent events in the series with their opening, closing, and resolution times. See the Get series events reference for the full response shape. You can also filter the main List events endpoint by seriesSlug to get full event details for a specific series:

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Event lifecycle within a series

Events in a series follow the standard event lifecycle:
  1. Open — the event is created and trading begins.
  2. Closed — trading stops (e.g. at the end of the hourly window).
  3. Resolved — the outcome is determined based on the real-world result.
For an hourly series, a typical event opens at the top of the hour, closes at the end of the hour, and resolves shortly after.