Polymarket Sports Data API: Markets, Live Books and Historical Depth
A Polymarket sports price is a tradable prediction-market outcome, not a sportsbook line. The API model should preserve the market, token and full ladder behind it.
A Polymarket sports data API should expose events and markets, map every outcome to its token identifier, return the current full order book and make capture time explicit. Historical research additionally needs recorded past ladders and settlement. DepthFeed joins those prediction-market objects with game, score and sportsbook context on its sports surface while retaining Polymarket as the venue source.
The core object chain
- Select a league and list the active Polymarket sports markets.
- Resolve the event, condition and outcome-token identifiers.
- Query the latest full bid/ask ladder for a selected token.
- Pull recorded book history for replay within the plan window.
- Join the market to a game record, score and settlement when available.
- Use source freshness fields before labeling any displayed price live.
Prediction-market prices are not conventional odds feeds
A Polymarket outcome token trades on a central limit order book. Its displayed probability depends on bid, ask and available size, while a sportsbook feed represents a different market structure. Comparing them can be useful, but the join should keep source, timestamp, rules and outcome mapping explicit.
Do not force every contract into a moneyline schema. Props, tournament winners and conditional outcomes need stable market text and identifiers before they can be compared safely.
DepthFeed sports endpoints
The DepthFeed sports API exposes an overview, league and market discovery, latest and historical books, games, linked markets, scores, players, injuries and sportsbook-line context. The same account and API key cover crypto and sports REST access.
Paid plans can subscribe to concrete Polymarket sports book channels on the main WebSocket. Historical sports depth is forward-captured, so every page and API response should state the available coverage rather than implying history before collection began.
Research uses
| Use case | Required fields | Main risk |
|---|---|---|
| Probability tracking | Bid, ask, size and timestamps | Calling a stale midpoint live |
| Cross-source comparison | Outcome map, rules and source times | Comparing different propositions |
| Backtesting | Historical ladders and settlement | Filling at a non-executable midpoint |
| Alerts | Freshness and threshold logic | Duplicate or delayed notifications |
Key takeaways
- 01Polymarket sports outcomes are tokenized order-book markets, not ordinary sportsbook lines.
- 02A reliable integration preserves event, condition and outcome-token identifiers.
- 03Historical depth and settlement are required for execution-aware replay.
- 04DepthFeed combines prediction-market books with game and odds context in one sports API.
- 05Coverage and freshness must be explicit for every live or historical claim.
Discover a Polymarket sports token, inspect its ladder and join it to the game context. Free Explorer tier, no card.
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