Kalshi Sportsbook API

Get access to Kalshi odds in real time: main markets, alt lines and player props, pregame and live, with sub-second latency.

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wss://spro.agency/api · example line_update

{
    "timestamp": "2026-10-25T17:02:41.118302+00:00",
    "action": "line_update",
    "data": {
        "sport": "NFL",
        "sportsbook": "kalshi",
        "game": "Kansas City Chiefs vs Las Vegas Raiders, 2026-10-25, 01",
        "home_team": "Kansas City Chiefs",
        "away_team": "Las Vegas Raiders",
        "info": { ... },
        "outcomes": {
            "Kansas City Chiefs Moneyline": {
                "odds": "-320",
                "outcome_name": "Moneyline",
                "outcome_line": null,
                "outcome_over_under": null,
                "outcome_target": "Kansas City Chiefs"
            }
        }
    }
}

Benefits

What you get with the Kalshi Sportsbook API

✓

Main markets.

Kalshi moneylines, spreads and totals across every sport and league they offer.

✓

Alt markets.

Alternate spreads and totals, so you get Kalshi's full line ladder, not just the main number.

✓

Player props.

Kalshi player props in the same consistent format as every other book we cover.

✓

Pregame & live.

Pregame odds hand off to live in-game odds on the same game, with no change to your integration.

✓

Sub-second latency.

No polling. Kalshi line moves are pushed to you over the WebSocket within a second.

✓

One normalized feed.

Kalshi alongside 35+ other sportsbooks, exchanges and prediction markets, all in one format.

About the API

The fastest Kalshi odds, in one place

BoltOdds + Kalshi Sports Betting API

BoltOdds streams Kalshi odds the moment they change, with no polling and sub-second latency. Line shop Kalshi against DraftKings, FanDuel, Bet365 and the rest of the market from a single connection.

See all sportsbooks

kalshi-odds.py

import asyncio, json, websockets

async def run_client():
    uri = "wss://spro.agency/api?key=YOUR_TOKEN"
    async with websockets.connect(uri) as ws:
        await ws.recv()  # socket_connected

        await ws.send(json.dumps({
            "action": "subscribe",
            "filters": {"sportsbooks": ["kalshi"]}
        }))

        while True:
            data = json.loads(await ws.recv())
            print(data)

asyncio.run(run_client())

Connect to the Kalshi API in under 5 minutes

Sign up, grab your API key and subscribe with "sportsbooks": ["kalshi"]. Odds arrive as structured JSON over a WebSocket, so there's nothing to poll and nothing to scrape.

Read the docs

BoltOdds