Getting Started

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Predexon API

Predexon provides a unified API for accessing prediction market data across multiple platforms. Get real-time and historical data from Polymarket and Kalshi through a single, consistent interface.

Key Features

Feature	Description
Cross-Platform Matching	Find equivalent markets on Polymarket and Kalshi to identify arbitrage opportunities
Real-Time Data	Current prices, volumes, and liquidity across all markets
Historical Data	Candlestick charts, volume trends, and price history
Wallet Analytics	Track PnL and positions for any Polymarket wallet
Unified Schema	Consistent data format regardless of source platform

Available Endpoints

Market Matching

Endpoint	Description
GET /v1/matching-markets	Find Kalshi markets matching a Polymarket slug (or vice versa)
GET /v1/matching-markets/pairs	Get all active exact matched pairs for arbitrage discovery

Kalshi Data

Endpoint	Description
GET /v1/kalshi/markets	List Kalshi markets with filters and sorting
GET /v1/kalshi/trades	Historical Kalshi trade data
GET /v1/kalshi/orderbooks	Historical Kalshi orderbook snapshots

Polymarket Data

Endpoint	Description
GET /v1/polymarket/markets	List markets with filters (totals only)
GET /v1/polymarket/markets/active	Active markets with 24h/1w/1m volume & liquidity
GET /v1/polymarket/candlesticks/{id}	OHLCV data at 1m, 1h, or 1d intervals
GET /v1/polymarket/market-price/{id}	Current or historical price for a token
GET /v1/polymarket/orders	Trade history and order flow
GET /v1/polymarket/trades	Historical trade data with flexible filtering
GET /v1/polymarket/activity	User trading activity (merges, splits, redeems)
GET /v1/polymarket/wallet/pnl/{address}	Realized PnL for a wallet
GET /v1/polymarket/wallet/positions/{address}	Current positions with unrealized PnL
GET /v1/polymarket/orderbooks	Historical orderbook snapshots (data from Jan 1, 2026)

Time Series

Endpoint	Description
GET /v1/polymarket/markets/{id}/volume	Historical volume over time
GET /v1/polymarket/markets/{id}/open_interest	Historical open interest over time

Authentication

All API endpoints (except /health) require authentication via API key:

Code
 
curl -H "Authorization: Bearer YOUR_API_KEY" \
  https://api.predexon.com/v1/polymarket/markets/active

Quick Example

Get the top 5 markets by volume with a single request:

Code
 
curl -X GET "https://api.predexon.com/v1/polymarket/markets/active?limit=5&sort=volume" \
  -H "Authorization: Bearer YOUR_API_KEY"

Code
 
{
  "markets": [
    {
      "title": "Will Trump win the 2024 election?",
      "side_a_price": 0.52,
      "volume_24_hours": 1250000.00,
      "volume_total": 150000000.00,
      "status": "open"
    }
  ],
  "pagination": { "total": 1250, "has_more": true }
}

Rate Limits

Tier	Requests/Minute	Best For
Free	60	Personal projects
Pro	500	Production apps

See Rate Limits for details on handling limits and upgrading.

Getting Started

1. Get an API Key - Sign up at predexon.com
2. Make Your First Request - Follow the Quickstart Guide
3. Explore the API - Browse the API Reference
4. Handle Errors - Review Error Handling

Use Cases

Arbitrage Detection

Code
 
Find price discrepancies between Polymarket and Kalshi for the same events

Trading Dashboards

Code
 
Build real-time dashboards with price charts and volume metrics

Portfolio Tracking

Code
 
Monitor wallet PnL and trading activity across markets

Market Research

Code
 
Analyze historical price movements and volume trends

Support

Need help? We're here for you:

• Documentation - You're reading it!
• API Reference - Interactive docs for all endpoints
• Discord - Join our community
• Email - [email protected]