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Market identifiers

Every market is uniquely identified by a platform and market_id pair.
PlatformID formatExample
KalshiTicker stringKXFED-26MAR19
PolymarketNumeric condition ID0x1234...abcd
RobinhoodEvent slugfed-rate-cut-march-2026
All endpoints that reference a specific market use the pattern: 
/v1/markets/{platform}/{market_id}

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The Market object

{
  "platform": "kalshi",
  "market_id": "KXFED-26MAR19",
  "title": "Will the Fed cut rates at the March 2026 meeting?",
  "url": "https://kalshi.com/markets/kxfed-26mar19",
  "category": "economics",
  "yes_price": 0.62,
  "volume_24h": 48250.00,
  "liquidity": 125000.00,
  "open_interest": 340000.00,
  "resolution_date": "2026-03-19T18:00:00Z",
  "updated_at": "2026-03-24T14:30:00Z"
}

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Price interpretation

The yes_price field represents the market’s implied probability that the event will occur:
  • 0.62 means the market prices the event at 62% likely
  • Prices range from 0.0 (won’t happen) to 1.0 (certain)
  • The difference between Rekko’s estimated probability and the market price is the edge

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Market lifecycle

Markets move through these stages:
StatusMeaning
activeTrading is open
closedTrading has ended, awaiting determination
determinedOutcome is known, settlement pending
finalizedFully settled and paid out
Use the Resolution Intelligence endpoint for detailed resolution timing, time decay estimates, and key upcoming dates.

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Platforms

Rekko covers three prediction market platforms: Kalshi — US-regulated exchange (CFTC-regulated). Markets use ticker-style IDs (e.g., KXBTC-26MAR14-100000). Higher regulatory certainty, tighter spreads on popular markets. Polymarket — Crypto-native exchange on Polygon. Markets use condition IDs. Higher volume on political and crypto markets, wider variety of events. Robinhood — Prediction markets integrated into the Robinhood brokerage app. Markets use event slugs. Growing retail audience with seamless access from the existing Robinhood user base.

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Listing markets

# List all markets (both platforms)
curl https://api.rekko.ai/v1/markets \
  -H "Authorization: Bearer YOUR_API_KEY"

# Filter by platform
curl "https://api.rekko.ai/v1/markets?source=kalshi&limit=20" \
  -H "Authorization: Bearer YOUR_API_KEY"

List Markets endpoint

Full endpoint documentation with playground.