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GET
/
v1
/
matching-markets
curl -H "x-api-key: YOUR_API_KEY" \
  "https://api.predexon.com/v1/matching-markets?kalshi_market_ticker=KXGGGNOMSCORE-25-TES"

{
  "query": {
    "platform": "KALSHI",
    "market_ticker": "KXBABYNAMEBOY-26DEC-HEN",
    "title": "Will Henry be the #1 most popular baby boy name in 2025?",
    "yes_subtitle": "Henry",
    "status": "active"
  },
  "matches": {
    "POLYMARKET": {
      "exact": [
        {
          "market_slug": "will-henry-rank-1-among-boy-names-on-the-ssas-official-list-for-2025",
          "title": "Will Henry rank #1 among boy names on the SSA's official list for 2025?",
          "status": "active",
          "explanation": "Exact match: candidate 1 asks the same event as the source (Henry is the #1 boy name on SSA's 2025 list) and would resolve identically based on the SSA list."
        }
      ],
      "related": [
        {
          "market_slug": "will-noah-rank-1-among-boy-names-on-the-ssas-official-list-for-2025",
          "title": "Will Noah rank #1 among boy names on the SSA's official list for 2025?",
          "status": "active",
          "explanation": "Related match: candidate 6 (Noah #1) same SSA 2025 boy-name ranking topic; different name; related."
        },
        {
          "market_slug": "will-liam-rank-1-among-boy-names-on-the-ssas-official-list-for-2025",
          "title": "Will Liam rank #1 among boy names on the SSA's official list for 2025?",
          "status": "active",
          "explanation": "Related match: candidate 5 (Liam #1) same SSA 2025 boy-name ranking topic; different name; related."
        }
      ]
    }
  },
  "summary": {
    "total_matches": 3,
    "exact_matches": 1,
    "related_matches": 2,
    "platforms": ["POLYMARKET"]
  }
}
Find equivalent markets across Polymarket and Kalshi platforms. Provide either Polymarket market slug(s) or Kalshi market ticker(s) to discover matches on the other platform.
Array Support: You can provide multiple market identifiers by repeating the query parameter.
Active Markets Only: Market matching is only available for markets that were active on or after November 3, 2025 (PST). Markets created before this date will not return matches.

​
Authentication

​
x-api-key
string
required
Your Predexon API key. Contact team@predexon.com to obtain an API key.

​
Query Parameters

​
polymarket_market_slug
string[]
Polymarket market slug(s) to find matches for. Provide the query parameter multiple times for multiple markets. Cannot be combined with kalshi_market_ticker.
​
kalshi_market_ticker
string[]
Kalshi market ticker(s) to find matches for. Provide the query parameter multiple times for multiple markets. Cannot be combined with polymarket_market_slug.
Either polymarket_market_slug OR kalshi_market_ticker is required (not both).

​
Response

​
query
object
Information about the queried market
​
matches
object
Matching markets organized by platform and match type
​
summary
object
Summary statistics about matches found

​
Match Types

  • Exact Matches: High-confidence matches representing the same event/outcome
  • Related Matches: Medium-confidence matches for similar or correlated events

​
Limitations

Kalshi Multi-Variate Markets: Kalshi supports multi-variate markets (e.g., multi-sport parlays, combo bets) which will not have matches found on Polymarket. Polymarket does not currently support multi-variate market structures, so these Kalshi markets will return empty match results.
Single-Outcome Markets Only: The matching algorithm works best with binary or single-outcome markets. Complex market structures may not find equivalent matches across platforms due to differences in market design.

​
Use Cases

​
Arbitrage Trading

Find price discrepancies between equivalent markets on different platforms.

​
Multi-Venue Monitoring

Track the same event across multiple platforms for comprehensive market intelligence. 
curl -H "x-api-key: YOUR_API_KEY" \
  "https://api.predexon.com/v1/matching-markets?kalshi_market_ticker=KXGGGNOMSCORE-25-TES"

{
  "query": {
    "platform": "KALSHI",
    "market_ticker": "KXBABYNAMEBOY-26DEC-HEN",
    "title": "Will Henry be the #1 most popular baby boy name in 2025?",
    "yes_subtitle": "Henry",
    "status": "active"
  },
  "matches": {
    "POLYMARKET": {
      "exact": [
        {
          "market_slug": "will-henry-rank-1-among-boy-names-on-the-ssas-official-list-for-2025",
          "title": "Will Henry rank #1 among boy names on the SSA's official list for 2025?",
          "status": "active",
          "explanation": "Exact match: candidate 1 asks the same event as the source (Henry is the #1 boy name on SSA's 2025 list) and would resolve identically based on the SSA list."
        }
      ],
      "related": [
        {
          "market_slug": "will-noah-rank-1-among-boy-names-on-the-ssas-official-list-for-2025",
          "title": "Will Noah rank #1 among boy names on the SSA's official list for 2025?",
          "status": "active",
          "explanation": "Related match: candidate 6 (Noah #1) same SSA 2025 boy-name ranking topic; different name; related."
        },
        {
          "market_slug": "will-liam-rank-1-among-boy-names-on-the-ssas-official-list-for-2025",
          "title": "Will Liam rank #1 among boy names on the SSA's official list for 2025?",
          "status": "active",
          "explanation": "Related match: candidate 5 (Liam #1) same SSA 2025 boy-name ranking topic; different name; related."
        }
      ]
    }
  },
  "summary": {
    "total_matches": 3,
    "exact_matches": 1,
    "related_matches": 2,
    "platforms": ["POLYMARKET"]
  }
}