Betstamp delivers PredictIt'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. PredictIt's own API covers PredictIt. Betstamp shows you where PredictIt disagrees with the rest of the market.
PredictIt publishes a read-only market-data API for its own markets, refreshed every 60 seconds and licensed for non-commercial use. It isn't built for comparing PredictIt to the rest of the market.
| Feature | PredictIt API | Betstamp |
|---|---|---|
| Venues | PredictIt only | PredictIt 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 |
| Public data API | Read-only, non-commercial use, 60-second refresh | REST pull + SSE stream |
PredictIt'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 PredictIt price.
The /api/markets endpoint takes a book_ids parameter — comma-separate PredictIt alongside Polymarket, Kalshi, ProphetX, Novig, bet365, FanDuel and any other book in your subscription. One call returns all of them in one normalized schema.
PredictIt markets are already matched to the sportsbook event and market, so you're comparing like with like.
Every PredictIt record arrives in one stable schema, so you can store it from the day you subscribe and build your own historical PredictIt data for backtesting. In the PRO Odds Screen, see how each PredictIt price has moved on every market.
Pull PredictIt 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 PredictIt 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 PredictIt 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 PredictIt plus any other books you need. Trial keys available for evaluation.
A single GET on /api/markets returns PredictIt 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 PredictIt price moves as they happen — one JSON object per data: message. No polling, no client-side queue.
# Pull NFL moneyline markets across every book in your subscription curl -H "X-API-KEY: $BETSTAMP_API_KEY" \ "https://api.pro.betstamp.com/api/markets?league=NFL&bet_types=moneyline&periods=FT&include=american"
import os, requests resp = requests.get( "https://api.pro.betstamp.com/api/markets", headers={"X-API-KEY": os.environ["BETSTAMP_API_KEY"]}, params={"league": "NFL", "bet_types": "moneyline", "periods": "FT", "include": "american"}, ) markets = resp.json()["markets"]
const params = new URLSearchParams({ league: 'NFL', bet_types: 'moneyline', periods: 'FT', include: 'american', }); const res = await fetch(`https://api.pro.betstamp.com/api/markets?${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, "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 PredictIt feed ships in every form — same data, same refresh, same delivery SLA.
See PredictIt 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 PredictIt is off-market.
The PredictIt data API for market makers, trading desks and quant teams. Live PredictIt 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 PredictIt data.
/api/markets + SSE at /v1/marketsYes. PredictIt publishes an API for its own markets. Betstamp adds normalized prices, cross-venue event matching and a fair-value line, so you can compare PredictIt to 200+ sportsbooks in one call.
Yes, and every record is yours to keep. From the day you subscribe, every PredictIt price arrives in the same schema as live, so you can store it and build a complete historical PredictIt record. The PRO Odds Screen also shows how each PredictIt 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.
Yes. Every venue is matched to the same events, so PredictIt, Polymarket and Kalshi prices sit in one response alongside the sportsbook line.
Browse the venues trading desks, market makers, and quant teams pull alongside PredictIt — or jump to the full list of 200+.