The Prediction Market Data API

Real-time and historical data across 6 platforms, smart money analytics, and cross-platform matching — all through a single API.

38+ Data Endpoints

6 Platforms

< 100ms Latency

Quickstart

Get up and running with your first API call in under 5 minutes.

API Reference

Explore the complete API documentation with interactive playground.

WebSocket

Stream real-time trades, orderbooks, and oracle events.

Trading API

Place and manage orders on Polymarket without handling wallets or gas.

What You Can Build

Market Data
Smart Money
Real-Time Streaming
Cross-Platform

Access real-time and historical data across Polymarket, Kalshi, Dflow, Limitless, Opinion, and Predict.Fun.

response = requests.get(
    "https://api.predexon.com/v2/polymarket/markets",
    headers={"x-api-key": API_KEY},
    params={"status": "open", "sort": "volume", "limit": 5}
)

Markets, events, and crypto up/down tracking
OHLCV candlesticks with 1m/1h/1d intervals
Volume charts, open interest, and orderbook snapshots
Historical trades and wallet activity

Track where the most profitable wallets are trading and follow their moves.

response = requests.get(
    "https://api.predexon.com/v2/polymarket/markets/smart-activity",
    headers={"x-api-key": API_KEY},
    params={"min_realized_pnl": 10000, "sort": "smart_volume"}
)

Smart money positioning per market
Global and per-market leaderboards
Wallet profiling and similarity detection
Cohort analysis by trading style

Get trade events the moment they happen — or even before, with mempool detection.

const ws = new WebSocket('wss://wss.predexon.com/v1/YOUR_API_KEY');
ws.onopen = () => ws.send(JSON.stringify({
  action: 'subscribe', platform: 'polymarket',
  version: 1, type: 'orders',
  filters: { users: ['0x1234...'] }
}));

Trades, activity, lifecycle, orderbook, and oracle channels
Pending trade detection (3–5s before confirmation)
Wildcard subscriptions for full firehose

Find equivalent markets across platforms for arbitrage and research.

response = requests.get(
    "https://api.predexon.com/v2/matching-markets",
    headers={"x-api-key": API_KEY},
    params={"polymarket_market_slug": "will-trump-win-2024"}
)

LLM-powered matching across Polymarket and Kalshi
Similarity scoring and confidence ranking
Pre-computed matched pairs for bulk analysis

Supported Platforms

Polymarket

Full data + trading — markets, wallets, smart money, orderbooks, and real-time WebSocket.

Kalshi

Markets, trades, and orderbooks with cross-platform matching.

Dflow

Solana-based trades, positions, and PnL tracking.

Limitless

Markets and orderbook snapshots.

Opinion

Markets and orderbook snapshots.

Predict.Fun

Markets, orderbooks, and trading support.

Pricing

Most market data is free. All core Polymarket, Kalshi, and Dflow market data endpoints are free and unlimited on every plan — they don’t count toward your monthly usage.

	Free	Dev	Pro	Enterprise
Price	$0/mo	$49/mo	$249/mo	$499+/mo
Rate Limit	1 req/s	20 req/s	100 req/s	Custom
Monthly Requests	1,000	1M	5M	Unlimited
WebSocket	—	10 subs	100 subs + wildcards	Custom
Smart Money & Matching	—	Yes	Yes	Yes

Get Free API Key

Start building in minutes — no credit card required.

View Full Pricing

Compare plans, overage rates, and enterprise options.

Need Help?

Join Discord

Get help from the community and stay updated on new features.

Email Support

Contact the team directly for enterprise inquiries or issues.

Getting Started

Data API

Trading API

Integrations

Predexon API

The Prediction Market Data API

Quickstart

API Reference

WebSocket

Trading API

What You Can Build

Supported Platforms

Polymarket

Kalshi

Dflow

Limitless

Opinion

Predict.Fun

Pricing

Get Free API Key

View Full Pricing

Need Help?

Join Discord

Email Support

Getting Started

Data API

Trading API

Integrations

​The Prediction Market Data API

Quickstart

API Reference

WebSocket

Trading API

​What You Can Build

​Supported Platforms

Polymarket

Kalshi

Dflow

Limitless

Opinion

Predict.Fun

​Pricing

Get Free API Key

View Full Pricing

​Need Help?

Join Discord

Email Support

The Prediction Market Data API

What You Can Build

Supported Platforms

Pricing

Need Help?