For Traders & Bot Developers

Backtest and trade
on the real order book

Replay every state of the historical order book for realistic fills and slippage — the book history real-time-only feeds lose forever — plus cross-venue spreads across Polymarket and Kalshi.

Get Started

Illustrative

Cross-platform price comparison

Same events, different prices. Both venues land in one schema, so you can line them up your way.

Arbitrage Opportunities Illustrative

Event	Polymarket	Kalshi	Spread
Fed holds rates June	0.72	0.68	4.0%
BTC above $200k EOY	0.24	0.20	4.0%
US GDP growth > 3%	0.38	0.35	3.0%

Illustrative pairs. Probalytics delivers both venues in one schema — defining which markets correspond is yours to control.

The Problem

Why unified data matters for trading

Without Probalytics

-3 different APIs with 3 different schemas
-Build and maintain your own normalization layer
-Weeks of engineering before you can even detect arbitrage

With Probalytics

+One API, one schema, all platforms
+Both venues in one schema — compare them in one query
+Start detecting arbitrage in minutes, not weeks

arbitrage-bot.js

// Fetch the same event across all platforms
const res = await fetch('https://api.probalytics.io/api/v1/markets', {
  headers: { 'Authorization': 'Bearer api_xxx:sk_xxx' }
})
const { data: markets } = await res.json()
// Compare prices across platforms to spot spreads

Trading Features

Built for serious traders

Historical Orderbook

Replay the full-depth book at any past millisecond. Real-time-only feeds lose it forever — we keep the history.

Cross-Platform Spreads

Both venues in one schema — pull them together and compute the spread in a single query.

Nearly 6 Years of History

Backtest cross-platform strategies on normalized historical data since 2020.

Participant-Level Fills

Every fill carries taker and maker IDs, so you can follow flow by wallet, not just by price.

Comparison

Why traders choose Probalytics

Feature	Other aggregators	Direct APIs
Single API
Unified schema
Direct SQL access
5+ years historical data	Limited	Varies

Start Trading Smarter

Ready to detect cross-platform arbitrage?

Start trading with unified prediction market data today.

Backtest and tradeon the real order book