For Traders & Bot Developers

Backtest and trade
on the real order book

Replay the tick-level historical order book at 1ms for realistic fills and slippage — the book history real-time-only feeds lose forever — plus cross-venue spreads across Polymarket, Kalshi & more.

Get Started

Live Demo

Cross-platform price comparison

Same events, different prices. We've already matched them for you.

Arbitrage Opportunities Live

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%

Events are automatically matched across platforms using semantic similarity. No manual mapping required.

The Problem

Why unified data matters for trading

Without Probalytics

-3 different APIs with 3 different schemas
-Manual event matching (is "BTC $100k" the same as "Bitcoin to hit $100,000"?)
-Build and maintain your own normalization layer
-Weeks of engineering before you can even detect arbitrage

With Probalytics

+One API, one schema, all platforms
+Events automatically matched using semantic similarity
+Query cross-platform spreads with a single call
+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.

Automatic Event Matching

"BTC $100k" on Polymarket = "Bitcoin to reach $100,000" on Kalshi. We link them for you.

Cross-Platform Spreads

Query price differences across platforms with a single API call.

5 Years of History

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

Performance

Speed matters in trading

~5min

Probalytics API

Frequent refreshes, unified data

1-5s

API Polling

Rate limited, always behind

Variable

Direct Blockchain

Block times, reorgs, complexity

Comparison

Why traders choose Probalytics

Feature	DomeAPI	Direct APIs
Single API
Unified schema
Cross-platform event matching
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