Prediction Market Data
Free real-time and historical prediction market data across Kalshi and Polymarket. 48,000+ active contracts. No signup required for public endpoints.
API
REST + MCP. No auth for public endpoints. 76 tools.
curl simplefunctions.dev/api/agent/worldDownload
CSV, Parquet, JSON. Daily exports via HuggingFace + R2.
Real-Time
World state (800 tokens, 15min). RSS feed. WebSocket via CLI.
Historical
488K resolved contracts. Brier calibration. 7-day price history.
Indicators
12 quantitative indicators. Implied yield, cliff risk, regime.
Quick start
curl https://simplefunctions.dev/api/agent/world
curl "https://simplefunctions.dev/api/public/screen?iy_min=200&tau_max=30"
npm i -g @spfunctions/cli && sf world
FAQ
Is prediction market data free?
Yes. All public endpoints require no authentication and have no usage fees. Rate-limited to 60 requests/minute.
How do I get prediction market data?
Three ways: (1) REST API at simplefunctions.dev/api/public/screen, (2) CLI with npm install -g @spfunctions/cli, (3) MCP server for AI agents. All cover 48,000+ active contracts across Kalshi and Polymarket.
What format is prediction market data available in?
JSON via API, CSV/Parquet via HuggingFace datasets, RSS for real-time feeds. Historical snapshots in Parquet. All data includes 12 quantitative indicators per market.