SignalBase aggregates Polymarket and Kalshi into one clean repository. Historical spreads, trending signals, model-ready exports — no API complexity, no trading interface. Just the data.
Every other tool is a trading interface. SignalBase is a data repository — designed for people who want raw signals, historical context, and exportable datasets to build their own edge.
Full price history on every contract. Export time-series data as CSV or JSON. Train your models on real market behavior, not synthetic data.
GET /archive/Fed-cuts-rate-2026
5-year spread history · 1-min resolution
Real-time feeds of which contracts are being searched, shared, and traded most. Catch the early signal before the price moves.
Download contract data in formats ready for backtesting. OHLCV candles, order book snapshots, volume time-series — exactly what your pipeline needs.
CSV · JSON · Parquet
No auth required · instant download
See the same contract on Polymarket AND Kalshi side by side. Compare spreads, spot arbitrage windows, and get the full picture.
Historical accuracy data going back years. Resolved outcomes, final prices, volume curves. Everything you need to validate a model before you risk capital.
5,000+ resolved contracts available. New archives added as markets settle.
Prediction markets are the world's most accurate forecasting tool. The data they generate is more valuable than the contracts themselves — and for too long, that data has been locked inside trading interfaces built for speculators, not analysts.
SignalBase exists to put that data in the hands of people building real models. Researchers, quants, data scientists, and independent analysts who want clean historical series, real-time signals, and exportable datasets — not a trading terminal with a login wall and a margin requirement.
The market is moving at $5.8 billion a week. The information asymmetry between institutional players and retail analysts is enormous. SignalBase closes that gap with free, ad-supported access to institutional-grade data.
The edge is in the data. Not the interface.