Kalshi Data API
Access sports odds from Kalshi, the CFTC-regulated US prediction market exchange, across 15 sports. Market-driven prices with last trade, best bid/ask, open interest, and liquidity per selection — normalized markets, paginated REST endpoints, a 30-day results archive, and a real-time WebSocket feed. One API key for all bookmakers.
{
"total": 1053,
"page": 1,
"limit": 5,
"totalPages": 211,
"hasNextPage": true,
"events": [
{
"sport": "soccer",
"league": "English Premier League",
"eventId": "soccer|26AUG24FULCFC",
"home": "Fulham",
"away": "Chelsea",
"live": false,
"startTime": "2026-08-24T19:00:00.000Z",
"endTime": "2026-08-24T22:00:00.000Z",
"openInterest": 100848.62,
"liquidity": 0,
"markets": [
{
"canonicalMarket": "MATCH_RESULT",
"rawName": "Match Result",
"period": "FULL_TIME",
"isActive": true,
"marketTicker": "ml_soccer|26AUG24FULCFC",
"openInterest": 96620.52,
"selections": [
{
"canonicalOutcome": "HOME",
"rawName": "Fulham",
"odds": 2.33,
"lastPrice": 0.43,
"bestBid": 0.37,
"bestAsk": 0.43,
"isActive": true
},
{
"canonicalOutcome": "DRAW",
"rawName": "Draw",
"odds": 4.0,
"lastPrice": 0.25,
"bestBid": 0.24,
"bestAsk": 0.25,
"isActive": true
},
{
"canonicalOutcome": "AWAY",
"rawName": "Chelsea",
"odds": 1.64,
"lastPrice": 0.61,
"bestBid": 0.55,
"bestAsk": 0.61,
"isActive": true
}
]
}
]
}
]
}Pre-match odds from Kalshi across 15 sports — Soccer, Tennis, Cricket, American Football, Esports, and more, including niche verticals like Darts, Lacrosse, and Australian Rules. Every price comes from real traders putting money on the line on a regulated exchange, not a bookmaker's margin.
Each selection carries decimal odds derived from the last traded price plus the current best bid and best ask. Markets and events include open interest and available liquidity — signal you simply cannot get from a classic sportsbook feed.
In-play events via REST and a real-time WebSocket push, broadcast roughly every second for the chosen sport. WebSocket streaming is available on PRO, MAX, and ULTRA plans — connect once and receive each update as it happens.
Query finished events from the last 30 days — filter by sport, league, or team (exact name, case-insensitive). Kalshi settles outcomes on-exchange, so results carry the event metadata and final open interest of each contract.
All markets use canonical naming (MATCH_RESULT, OVER_UNDER) with explicit periods, alongside the raw Kalshi market ticker for on-exchange cross-referencing. The same structure is used across all sports and bookmakers, so there are no mapping headaches.
A single API key unlocks every odds source included in your plan — Kalshi, Polymarket, Bet365, Betfair, BetOnline, and more. Compare regulated prediction-market prices against classic bookmaker odds with no separate accounts or rotation logic.
PulseScore provides pre-match and live sports odds from Kalshi, the CFTC-regulated US prediction market exchange, across 15 sports. Each event includes normalized market data with canonical market types, selections with decimal odds, last traded price, best bid/ask, and per-market open interest and liquidity. Finished events are also stored as results for 30 days.
Kalshi is a regulated exchange where traders buy and sell yes/no contracts on event outcomes, so prices are set by the market, not by a bookmaker. The decimal odds are derived from the last traded price (odds = 1 / price), and each selection also exposes the current best bid and best ask so you can see the spread. Open interest and liquidity fields tell you how much conviction is behind a price.
The 15 sports Kalshi publishes markets for: Soccer, Basketball, Tennis, Table Tennis, Cricket, American Football, Australian Rules, Baseball, Boxing, Darts, Esports, Golf, Lacrosse, MMA, and Rugby Union. Each sport exposes /leagues, /leagues/:league/events, /events (paginated), and /events/:eventId.
Kalshi has no separate league feed, so /api/kalshi/<sport>/leagues derives the league list (with event counts) from the current events on the fly. Use /leagues/:league/events to pull all events for one league by name.
All markets use a canonical format: each market has a type (e.g., MATCH_RESULT, OVER_UNDER), period (FULL_TIME), and selections with decimal odds, last traded price, and best bid/ask. Markets also carry their Kalshi market ticker, so you can cross-reference the contract on the exchange. The same canonical structure is used across all sports and bookmakers.
Yes. Live in-play events are available via REST (/api/kalshi/live-events, /live-events/sports, /live-events/events/:eventId) and via WebSocket at wss://api.pulsescore.net/api/kalshi/ws/live. The WebSocket pushes every in-play event for the subscribed sport roughly every second. PRO, MAX, and ULTRA plans only.
Yes. Finished events are retained for 30 days and served from /api/kalshi/results, with optional sport, league, and team filters (exact names, case-insensitive) plus /results/sports and /results/events/:eventId. Kalshi settles outcomes on-exchange, so results carry the event metadata and final open interest rather than a score.
Yes. The BASIC plan is free and includes 500 API requests per month. Upgrade to PRO, MAX, or ULTRA for unlimited requests.
Yes. A single API key gives you access to every odds source included in your plan — Kalshi, Polymarket, Bet365, Betfair Sportsbook, BetOnline, and more. That makes bookmaker-vs-prediction-market comparisons trivial. No need for separate keys or accounts.
Free tier available. No credit card required. Get your API key in 30 seconds.