Betstamp delivers Kalshi's markets through one API: live prices, normalized next to a fair-value line built from 200+ sportsbooks, ready to store for your own historical data. Kalshi's own API covers Kalshi. Betstamp shows you where Kalshi disagrees with the rest of the market.
Live Kalshi odds and contract prices across every league we match, next to the sportsbook line.
| Coverage | Pre-game + Live |
|---|---|
| Markets priced | ~1.4M market selections per month |
| Leagues (21) | MLB, NCAAF, NFL, WNBA, NHL, Tennis, MLS, EPL, UFC, Champions League, La Liga, Serie A, NBA, KBO, Euro Basketball, Ligue 1, Bundesliga, CFL, EFL Championship, Eredivisie, Saudi Pro League |
| Market types | Moneyline, Spread, Total, Player Props, Game Props |
| Player props | Yes — MLB, NFL, WNBA, NHL, EPL, Champions League, NBA |
| Refresh | Sub-second — Betstamp relays Kalshi's order-book stream, no polling |
| Price formats | Decimal · American |
| Delivery | REST pull + SSE stream |
Kalshi's API documentation and getting-started guide cover market data, order placement and a demo environment, for Kalshi only. They're the right tools for trading on Kalshi; they aren't built for comparing Kalshi to the rest of the market.
| Feature | Kalshi API | Betstamp |
|---|---|---|
| Venues | Kalshi only | Kalshi plus 200+ sportsbooks and other exchanges |
| Price format | Contract prices (0–100¢) | Decimal and American odds, normalized across every venue |
| Fair value | Not provided | No-vig line from sharp books, per market |
| Event matching | You map events yourself | Events and markets already matched across venues |
| Order placement | Yes | No — Betstamp is data, not execution |
Use Kalshi's API to trade. Use Betstamp to know where to trade.
Kalshi's prices mean more next to everyone else's. Betstamp puts them there.
Where to quote, from sharp-book consensus: Betstamp's True Line, a no-vig price, sits next to every Kalshi price. If you're running a Kalshi bot, this is the line to compare against.
The /api/markets endpoint takes a book_ids parameter — comma-separate Kalshi alongside Polymarket, ProphetX, Novig, bet365, FanDuel and any other book in your subscription. One call returns all of them in one normalized schema.
Kalshi markets are already matched to the sportsbook event and market, so you're comparing like with like.
Every Kalshi record arrives in one stable schema, so you can store it from the day you subscribe and build your own historical Kalshi data for backtesting. In the PRO Odds Screen, see how each Kalshi price has moved on every market.
Pull Kalshi into the PRO Odds Screen, the Betstamp API, or both — same pricing, same refresh rate, same normalized schema. Pick the delivery that fits your stack, switch later if it changes.
99.99% uptime SLA on the Kalshi feed. Slack channel with our trading desk. Schema changes upstream don't break your pipeline — we handle the maintenance.
A contract at 62¢ implies a 62% probability. Decimal odds = 1 / 0.62 = 1.61. American odds = −(62 / 38) × 100 = −163. Before comparing with a sportsbook, strip the book's vig so both sides are fair probabilities — that's what Betstamp's True Line does for every market. Try it with the no-vig fair odds calculator.
If you can hit a REST endpoint, you can pull Kalshi prices. Three steps, one key, the same schema as every other venue.
Request a demo, scope your usage, and we issue a key scoped to Kalshi plus any other books you need. Trial keys available for evaluation.
A single GET on /api/markets returns Kalshi markets for the league and periods you specify. Filter by bet_types, is_live and book_ids.
Connect to /v1/markets via Server-Sent Events to receive Kalshi price moves as they happen — one JSON object per data: message. No polling, no client-side queue.
# Pull NFL moneyline markets for Kalshi curl -H "X-API-KEY: $BETSTAMP_API_KEY" \ "https://api.pro.betstamp.com/api/markets?league=NFL&book_ids=194&bet_types=moneyline&periods=FT&include=american"
import os, requests resp = requests.get( "https://api.pro.betstamp.com/api/markets", headers={"X-API-KEY": os.environ["BETSTAMP_API_KEY"]}, params={"league": "NFL", "book_ids": "194", "bet_types": "moneyline", "periods": "FT", "include": "american"}, ) markets = resp.json()["markets"]
const params = new URLSearchParams({ league: 'NFL', book_ids: '194', bet_types: 'moneyline', periods: 'FT', include: 'american', }); const res = await fetch(`https://api.pro.betstamp.com/api/markets?${params}`, { headers: { 'X-API-KEY': process.env.BETSTAMP_API_KEY }, }); const { markets } = await res.json();
# Response (real schema, truncated) { "markets": [ { "id": "0192b4a1-8f13-7c2b-8629-aa3ef295e2f0", "odds": 1.91, "american": "-110", "side": "DAL", "side_type": "Away", "bet_type": "Moneyline", "period": "FT", "league": "NFL", "is_alt": false, "is_live": false, "odd_provider_id": 194, "fixture_id": "01926d5e-819d-7b33-b7ff-bbe89e134958", "team_id": "0191b82a-3435-7e85-95d0-7b3be256709e" } ] }
Market makers want an API to quote from. Pricing teams want JSON. Traders want a screen. Every Betstamp Kalshi feed ships in every form — same data, same refresh, same delivery SLA.
See Kalshi pricing side-by-side with 200+ books in the Betstamp PRO Odds Screen. Main lines, player props, and alternates — refreshed in real time and benchmarked against our True Line. The fastest way to find where Kalshi is off-market.
The Kalshi data API for market makers, trading desks and quant teams. Live Kalshi prices via REST pull or SSE stream — structured JSON, matched to the same events and markets as 200+ other books. Store every record from day one to build your own historical Kalshi data.
/api/markets + SSE at /v1/marketsYes. Kalshi publishes an API for its own markets. Betstamp adds normalized prices, cross-venue event matching and a fair-value line, so you can compare Kalshi to 200+ sportsbooks in one call.
Yes, and every record is yours to keep. From the day you subscribe, every Kalshi price arrives in the same schema as live, so you can store it and build a complete historical Kalshi record. The PRO Odds Screen also shows how each Kalshi price has moved on every market. Betstamp doesn't provide backfills from before your subscription starts.
Divide the contract price in cents by 100 for implied probability. For a 62¢ contract: 62% → decimal 1.61 → American −163. Betstamp returns decimal and American odds in every record.
Betstamp's Kalshi feed is built for sports: moneyline, spread, total, player props, game props across 21 leagues, pre-game and live, with 1.4M+ market selections priced per month and every one matched to the same event as 200+ sportsbooks.
Yes. Every venue is matched to the same events, so Kalshi, Polymarket and Novig prices sit in one response alongside the sportsbook line.
Yes, through Kalshi's own API. Betstamp doesn't place orders; it gives you Kalshi prices matched to 200+ sportsbooks and a fair-value line so you know where to quote.
Kalshi's API is free to use with a Kalshi account; check Kalshi's docs for current rate limits. Betstamp's Kalshi feed is priced by subscription — request a demo for pricing.
Browse the venues trading desks, market makers, and quant teams pull alongside Kalshi — or jump to the full list of 200+.