Polymarket API for Market Data
Polymarket's official CLOB and Gamma APIs are on-chain and keyed by condition and token IDs, one venue in its own schema. SharpAPI gives you normalized Polymarket implied probabilities alongside the other books we carry. 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 the other books we carry in one endpoint
- ✓ No scraping, no ToS violations, stable and documented
- ✓ Built-in +EV detection vs Pinnacle sharp lines
- ✓ SSE push-based delivery; freshness also depends on book capture. Streaming is a paid add-on on top of any paid plan
- ✓ Free tier: 12 req/min on DraftKings and FanDuel, 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.
Which Polymarket: SharpAPI carries the global market at polymarket.com. Polymarket US, the separate US-regulated exchange at polymarket.us, is a different venue with its own order books and is not covered.
+EV detection starts on Pro ($229/mo), and the no-vig fair odds SharpAPI computes are returned with that +EV payload. Long-term historical odds are Enterprise-only. A free tier is available at $0/month with 60-second delayed data.
The Problem: No Public Polymarket API
Polymarket is a prediction market, not a traditional sportsbook. Its official CLOB and Gamma APIs return on-chain markets in Polymarket's own schema. Developers who want Polymarket implied probabilities normalized alongside sportsbook lines have to build that layer themselves.
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
- Official API is on-chain and venue-specific, not normalized across books
- 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. Push-based delivery removes your poll interval. End-to-end freshness also depends on how often each sportsbook can be captured.
Feature Comparison
| Feature | SharpAPI | Direct Polymarket Access |
|---|---|---|
| Polymarket Odds | Normalized, stable API | Undocumented, breaks often |
| Other Sportsbooks | Included in the same 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 @sharp-api/client - 4Query Polymarket odds using the code examples below.
REST: Query Polymarket Odds
import { SharpAPI } from '@sharp-api/client';
const sharp = new SharpAPI('sk_live_your_key');
// Get Polymarket odds
const odds = await sharp.odds.get({
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'
+ '&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 when Polymarket
// lines move
console.log(data.event_name);
console.log(data.odds_american);
});Full TypeScript SDK with IntelliSense. npm install @sharp-api/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. The free tier covers DraftKings and FanDuel at 12 req/min, no credit card required.
Frequently Asked Questions
Is there a Polymarket API?
Yes. Polymarket has official APIs (the CLOB and Gamma APIs), on-chain and USDC-denominated, keyed by condition and token IDs. They return Polymarket markets in Polymarket's own schema, not Polymarket implied probabilities normalized next to sportsbook lines. SharpAPI provides that: normalized Polymarket market prices alongside traditional sportsbooks through a stable, documented REST API.
Does SharpAPI cover Polymarket US?
No. The Polymarket feed SharpAPI carries is the global market at polymarket.com. Polymarket US, the separate US-regulated exchange at polymarket.us, is a different venue with its own order books and is not covered.
How do I get Polymarket data programmatically?
The best way to access Polymarket market data is through SharpAPI. Sign up, pick a paid plan, get an API key, and query Polymarket odds and implied probabilities alongside the other books we carry 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 the other books we carry including Polymarket, Pinnacle, DraftKings without managing multiple data sources.
How fast are Polymarket updates on SharpAPI?
Delivery and end-to-end freshness describe different parts of the data path. Delivery of Polymarket price changes from our edge to your client is push-based over SSE streaming (a paid add-on on top of any paid plan). End-to-end freshness also depends on how often the source can be captured. Capture cadence, not transport, sets how fresh a line is.
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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