Bidirectional cross-exchange contract lookup. Given any contract ID — a Kalshi ticker or a Polymarket contract ID — returns the full cluster: every contract in the same cross-exchange group and the relationships between them.
The response is identical regardless of which contract ID in the cluster you query. A match lookup is only counted against your daily quota if it is a new cluster — repeated lookups of any ID within the same cluster are always free.
Any Kalshi contract ticker or Polymarket contract ID.