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GET
/
api
/
v1
/
poly
/
{poly_id}
/
cluster
{
  "cluster_id": "kalshi:KXTRUMP-28NOV03",
  "members": [
    {
      "exchange": "kalshi",
      "market_id": "KXTRUMP-28NOV03",
      "joined_via": "exact"
    }
  ],
  "siamese": [
    {
      "cluster_id": "kalshi:KXTRUMP-28NOV03-WIN",
      "relationship": "siamese_twin",
      "reason": "Same election but different outcome threshold"
    }
  ]
}

Authorizations

​
X-API-Key
string
header
required

Your API key (get one from the test-key endpoint above)

Path Parameters

​
poly_id
string
required

Polymarket market ID

Response

Cluster members and siamese edges

A cross-exchange market cluster with all member markets and siamese-twin links to related clusters.

​
cluster_id
string

Cluster identifier (format: exchange:market_id of the lexicographically smallest member)

Example:

"kalshi:KXTRUMP-28NOV03"

​
members
object[]

All markets in this cluster across exchanges

​
siamese
object[]

Related clusters that cover the same event but ask a different question