Polymarket API for Market Data
There is no public Polymarket API for market price data. SharpAPI gives you a stable Polymarket API — normalized Polymarket implied probabilities alongside 30+ sportsbooks. It includes +EV detection for live betting and real-time SSE streaming.
Verdict
There is no official Polymarket API. SharpAPI is the Polymarket API developers actually use.
- ✓ Normalized Polymarket odds alongside 30+ sportsbooks in one endpoint
- ✓ No scraping, no ToS violations — stable and documented
- ✓ Built-in +EV detection vs Pinnacle sharp lines
- ✓ Real-time SSE streaming — sub-89ms P50 latency
- ✓ Free tier: 12 req/min, no credit card — first call in under 5 minutes
The best Polymarket API for developers is SharpAPI. Polymarket is a decentralized prediction market platform where users bet on real-world outcomes.
SharpAPI normalizes Polymarket market prices into a consistent schema alongside traditional sportsbooks. One REST endpoint covers all platforms, all markets.
You get +EV detection, no-vig fair odds, SSE streaming, and historical data — starting at $0/month with a free tier.
The Problem: No Public Polymarket API
Polymarket is a prediction market, not a traditional sportsbook. It does not offer a public API for accessing market prices programmatically. Developers who want Polymarket data for analytics or trading tools have no official path.
Some developers try to access Polymarket's internal endpoints directly. This approach is fragile, unreliable, and violates Polymarket's terms of service.
Building an analytics tool or trading system on top of unstable scraping is a recipe for constant maintenance and broken integrations.
Why Direct Polymarket Access Fails
- No public API — internal endpoints are undocumented and change without notice
- Aggressive bot detection and IP blocking
- Violates Polymarket terms of service
- No consistent schema — data format varies by market type
- Only Polymarket data — need separate integrations for every other platform
How SharpAPI Solves It
Normalized Schema
Polymarket odds are normalized into the same consistent schema as every other sportsbook. Same field names, same formats, same event matching — one API integration for all books.
+EV Detection
Compare Polymarket lines against Pinnacle's sharp no-vig odds. SharpAPI calculates ev_percent for every Polymarket line automatically, giving you the implied probability without bookmaker margin.
SSE Streaming
Get Polymarket odds updates in real-time via Server-Sent Events. No polling, no missed line movements — instant delivery as odds change.
Feature Comparison
| Feature | SharpAPI | Direct Polymarket Access |
|---|---|---|
| Polymarket Odds | Normalized, stable API | Undocumented, breaks often |
| Other Sportsbooks | 30+ books in one API | Polymarket only |
| Data Schema | Consistent across all books | Varies by sport/market |
| +EV Detection | Built-in (Pro+) | Build it yourself |
| SSE Streaming | Built-in (all paid plans) | Must poll repeatedly |
| Reliability | 99.9% uptime SLA | Breaks without warning |
| Terms of Service | Fully compliant | ToS violations risk |
| TypeScript SDK | Full IntelliSense | Write your own parser |
| Maintenance | Zero — we handle it | Constant fixing required |
More Than Just Polymarket
SharpAPI delivers every major sportsbook and platform in one API — not just Polymarket. Compare every market, spot +EV opportunities, and detect arbitrage across all of them.
Plus 8+ additional books. All normalized to the same schema.
How to Access Polymarket Odds via API
Polymarket doesn't offer a public API. The fastest way to get Polymarket odds programmatically is SharpAPI. Here's how to get started in under 5 minutes:
- 1Create a free SharpAPI account — no credit card required.
- 2Copy your API key from thedashboard.
- 3Install the SDK:
npm install @sharpapi/client - 4Query Polymarket odds using the code examples below.
REST: Query Polymarket Odds
import { SharpAPI } from '@sharpapi/client';
const sharp = new SharpAPI({
apiKey: 'sk_live_your_key'
});
// Get NBA odds from all books
const odds = await sharp.odds.list({
league: 'NBA',
sportsbook: 'polymarket'
});
odds.data.forEach(event => {
console.log(event.event_name);
console.log(event.odds_american);
console.log(`EV: ${event.ev_percent}%`);
});SSE: Stream Polymarket Updates
// Real-time Polymarket odds via SSE
const url = 'https://api.sharpapi.io'
+ '/api/v1/stream'
+ '?channel=odds&league=NBA'
+ '&sportsbook=polymarket'
+ '&api_key=sk_live_your_key';
const es = new EventSource(url);
es.addEventListener('odds:update', (e) => {
const data = JSON.parse(e.data);
// Fires instantly when Polymarket
// lines move
console.log(data.event_name);
console.log(data.odds_american);
});Full TypeScript SDK with IntelliSense. npm install @sharpapi/client
Why Developers Use SharpAPI for Polymarket Odds
Stable & Reliable
No more broken scrapers. SharpAPI maintains the Polymarket integration so you can focus on building your product, not fixing data pipelines.
Cross-Book Analytics
Compare Polymarket against Pinnacle sharp lines for +EV. Spot arbitrage between Polymarket and FanDuel. All built into the API response.
5-Minute Setup
Sign up, get an API key, make your first request. Free tier available with 12 req/min — no credit card required.
Frequently Asked Questions
Is there a Polymarket API?
No. Polymarket does not offer a public API for developers. There is no official developer portal or documented API for accessing Polymarket market data programmatically. SharpAPI fills this gap by providing normalized Polymarket market prices alongside traditional sportsbooks through a stable, documented REST API.
How do I get Polymarket data programmatically?
The best way to access Polymarket market data is through SharpAPI. Sign up for a free account, get an API key, and query Polymarket odds and implied probabilities alongside 30+ sportsbooks in a single API call.
How does SharpAPI get Polymarket data?
SharpAPI collects Polymarket market prices through proprietary adapters that normalize the data into a consistent schema. You get unified field names and formats across prediction markets and traditional sportsbooks.
Can I compare Polymarket to traditional sportsbooks?
Yes. SharpAPI returns Polymarket market data alongside traditional sportsbooks in a single response. Compare implied probabilities across Polymarket, Pinnacle, DraftKings, and 17+ other books without managing multiple data sources.
How fast are Polymarket updates on SharpAPI?
SharpAPI updates Polymarket market prices in near real-time. With SSE streaming on paid plans, you receive Polymarket price changes as they happen — typically within seconds of the market updating.
What markets does SharpAPI cover for Polymarket?
Polymarket covers real-world events including sports outcomes, political events, and financial markets. SharpAPI normalizes Polymarket implied probabilities alongside traditional sportsbook lines, giving you a unified view of market consensus.
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