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The Oddpool API provides programmatic access to prediction market data across Kalshi and Polymarket — including whale trades, cross-venue arbitrage, price spreads, real-time WebSocket feeds, and full-text search. All API requests should be made to: 
https://api.oddpool.com

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Quick start

curl -H "X-API-Key: your_api_key" \
  "https://api.oddpool.com/arbitrage/current?min_net_cents=0.5"
A machine-readable version of these docs is available at /llms.txt — fetch it to get the full API reference as structured markdown.

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What you can build

WebSocket feeds

Stream real-time orderbooks, trades, and probability distributions from Kalshi and Polymarket over a single connection.

Whale tracking

Monitor large trades across prediction markets. Track events and get alerts when whales move.

Arbitrage scanner

Find cross-venue arbitrage opportunities and price spreads between Kalshi and Polymarket.

Market search

Full-text search across all prediction markets with filtering by exchange, category, volume, and liquidity.

Kalshi historical

Orderbook snapshots, top-of-book timeseries, and trade tapes for Kalshi markets.

Polymarket historical

Orderbook snapshots, top-of-book timeseries, and trade tapes for Polymarket markets.