# Polymarket

> Prediction market exchange whose public Gamma API lists markets and events, including sports, without credentials; separate trading APIs and SDKs exist.

Canonical page: https://sportdex.net/providers/polymarket/  
Last checked: 2026-11-03  
SportDex Score: 67/100 (rank 6; popularity 61, community 88, transparency 65, developer experience 54)

## Facts
- Type: Betting exchange
- Website: https://polymarket.com
- Documentation: https://docs.polymarket.com/
- Pricing page: unknown
- Country: United States
- Sports: Multi-sport (40+)
- Data types: Trading & risk, Fixtures, Odds
- Protocols: REST
- Delivery: Polling only (REST)
- Live / in-play: not disclosed
- Free tier: yes
- Cheapest public paid plan: not public
- Authentication: none

## Plans
| Plan | Price | Requests | Notes |
|---|---|---|---|
| Public read APIs | Free | — | Gamma market data readable without keys; trading requires wallet auth |

## Who it is for

Best for: Developers wanting free public market and event data, including sports, from a prediction market exchange without credentials.

Not ideal for: Sports-only data needs or bookmaker odds; it is a prediction exchange and sports endpoints and rate limits were not verified.

Use cases: Prediction market tracking; Sports event probability displays

Limitations:
- Not sports-only
- Sports endpoints and rate limits unverified
- Trading uses separate APIs

## Quick answers

**What is Polymarket best for?** Developers wanting free public market and event data, including sports, from a prediction market exchange without credentials. Not ideal for: Sports-only data needs or bookmaker odds; it is a prediction exchange and sports endpoints and rate limits were not verified.

**How much does Polymarket cost?** Polymarket does not publish prices on the pages we checked.

**Does Polymarket have a free tier?** Yes. Polymarket lists a free plan called "Public read APIs".

**What does Polymarket cover?** Polymarket is a betting exchange. Its sports: Multi-sport (40+); data: Trading & risk, Fixtures, Odds.

**Does Polymarket have a WebSocket or streaming API?** No streaming is listed. Polymarket delivers data by REST, so you poll for updates.

**What do developers say about Polymarket?** Widely used as a free, no-key source of prediction-market prices (Gamma and CLOB APIs) for sports arbitrage bots, wallet trackers and odds aggregators, with many GitHub clients and MCP servers. Users note thin or missing historical data and the need to match events across Kalshi and sportsbooks; live-score speed is a concern.

**What are the alternatives to Polymarket?** Close alternatives in the SportDex catalog: Matchbook Exchange, Smarkets, BETDAQ, SX Bet, Betfair Exchange API.

## What developers say

Widely used as a free, no-key source of prediction-market prices (Gamma and CLOB APIs) for sports arbitrage bots, wallet trackers and odds aggregators, with many GitHub clients and MCP servers. Users note thin or missing historical data and the need to match events across Kalshi and sportsbooks; live-score speed is a concern.

Praised for: Public market data without credentials; Large ecosystem of SDKs and bots; Useful sharp-price signal versus sportsbooks; Many tutorials for Python access

Complaints: Historical data hard to find, especially before 2024; Manual cross-venue event matching; Not a live-score source

## Method
Facts were read from the provider's own pages on 2026-11-03. Empty fields mean the provider does not say, not that a feature is missing. Method: https://sportdex.net/methodology/