Guides & resources

Prediction-market data, explained

Practical, vendor-neutral guides on the data behind Polymarket and Kalshi — how the markets settle, how the order book works, and how to backtest against real liquidity instead of a last price.

PolymarketBacktesting8 min

How to Backtest Polymarket Strategies on the Order Book

A last price sampled once an hour can't tell you whether your order would have filled. Here's how to backtest Polymarket against the book it would actually have traded against.

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PolymarketData quality6 min

Polymarket CLOB WebSocket vs Hourly Archives: Why Resolution Decides Your Backtest

The difference between a Polymarket backtest you can trade on and one that lies is usually not how much data you have — it's how it was sampled.

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KalshiMarket mechanics7 min

How Kalshi Crypto Markets Settle: Reference Prices and What It Means for Your Data

Kalshi's crypto contracts are yes/no bets on where a reference price lands at a fixed time. Getting the data right around that moment is what makes a Kalshi backtest honest.

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KalshiMarket mechanics6 min

Kalshi Crypto Market Windows and Series, Explained

Kalshi's crypto tickers look cryptic. Here's how the series map to market windows, and how to pull exactly the cadence you want.

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Both venuesData quality6 min

Order-Book Depth vs Last Price: Why Most Prediction-Market Backtests Lie

A last price is one number. The order book is the liquidity that number sits on top of. Backtests built on the first quietly inflate every result.

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Both venuesComparison8 min

Polymarket vs Kalshi Data: What's Actually Available, and How to Use Both

Polymarket and Kalshi look similar from the outside and expose very different data underneath. Here's the honest, per-venue breakdown.

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