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GET
Search series
A series groups recurring or related events under one identifier. KXBTC15M is the Kalshi 15-minute Bitcoin up/down series — one event opens every 15 minutes and a new market is created for it. btc-up-or-down-15m is the Polymarket equivalent. KXFEDDECISION is the series for Kalshi Fed rate-decision events. Use this endpoint to find a series_id, then pass it to Search markets or Search events to drill in.

Parameters

string
Matches the series title (full-text) or the series_id (case-insensitive substring). q=KXBTC returns every Kalshi BTC series; q=15m returns every 15-minute series across both venues; q=bitcoin returns series whose title contains “Bitcoin”.
string
kalshi or polymarket.
string
Exact match on category. Common values: Crypto, Sports, Politics, Up or Down.
string
default:"active"
active or closed.
string
default:"title"
title (alphabetical) or newest (by discovered_at).
integer
default:"30"
1-100.
integer
default:"0"
Pagination offset.

Examples

Find all 15-minute crypto series across both venues

A single call surfaces the matching Kalshi and Polymarket series side by side.

Browse Polymarket sports series

Response

Field reference

Not every event belongs to a series — about 15% are one-off markets (news markets, single-instance political markets) that aren’t part of any recurring group. Find those via Search events text search instead.