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Parameters

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id
string
required
Series identifier. Kalshi: series_ticker (e.g. KXSPX). Polymarket: UUID.

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Returns

The matching Series. See fetch_series for the full field list. Kalshi includes volume automatically. 
let series = ex.fetch_series_one("KXSPX").await?;

{
  "id": "KXSPX",
  "title": "S&P 500 Daily",
  "category": "Economics",
  "frequency": "daily",
  "tags": ["finance", "indices"],
  "settlement_sources": [{ "name": "S&P Dow Jones", "url": "https://www.spglobal.com" }],
  "fee_type": "quadratic",
  "volume": 1234567.89,
  "last_updated_ts": "2026-04-27T00:00:00Z"
}