Odds API / By sportsbook / Polymarket
Polymarket odds API
Polymarket is a betting exchange / prediction market with international coverage. PropLine pulls its odds into one REST API for 21 competitions (MLB, NBA, NFL, NHL, NCAAB, NCAAF, Tennis and 14 soccer leagues). Prices are polled before and during games. Filter to this book with bookmakers=polymarket.
No credit card. 1,000 requests / day on the free tier.
What we carry from Polymarket
Sports
Soccer leagues
This list is generated from the sports we poll Polymarket for. A competition only returns Polymarket odds while the book has a board up for it, so an off-season league comes back empty.
Try it
MLB odds from Polymarket only:
curl "https://api.prop-line.com/v1/sports/baseball_mlb/odds?apiKey=YOUR_KEY&bookmakers=polymarket"List the events first if you want one game:
curl "https://api.prop-line.com/v1/sports/baseball_mlb/events?apiKey=YOUR_KEY"Drop bookmakers= to get every book in the same call, or pass several keys comma-separated. The response is the-odds-api compatible — events, bookmakers, markets, outcomes — so switching is usually a base URL change. Use markets=h2h,spreads,totals to pick markets.
Related
Odds API pages by market
Get your free Polymarket odds API key
1,000 requests / day. No credit card. One key covers Polymarket and every other book we carry.
Free tier includes 1,000 requests/day. Upgrade anytime.