Kalshi · orderbook history
Kalshi's API tells you what the book looks like now — not what it looked like during last month's CPI print. Predexon has recorded the complete Kalshi orderbook tick by tick from always-on infrastructure since January 2026, so you can replay any market's full depth at any captured moment.
Every placement, update, cancel, and fill with millisecond timestamps, in the same normalized schema as our Polymarket history — so cross-venue microstructure research works without any mapping code. Quote slices for free, download as compressed Parquet.
Every order added to any Kalshi book, price/size/side
Every quote modification and removal
Every execution matched to its resting order
All price levels of the yes/no book
Exact event ordering for faithful replay
Series, ticker, and settlement joined in
# Quote a Kalshi slice — free
curl "https://api.predexon.com/v2/data/ticks/quote?venue=kalshi\
&market=<market-ticker>&granularity=raw\
&from=2025-01-01&to=2025-03-31" \
-H "x-api-key: <your-api-key>"
# → {"quote_id": "qt_2c9b…", "size_gib": 0.8, "price_usd": 1.60}
# Download compressed Parquet
curl "https://api.predexon.com/v2/data/ticks?quote_id=qt_2c9b…" \
-H "x-api-key: <your-api-key>"Predexon provides tick-level Kalshi orderbook history. Quote any market and date range for free via the API to see exact size and cost, then download compressed Parquet through a signed URL. New accounts get $50 in free credits.
No — Kalshi's API serves the current orderbook only. Book history has to be recorded in real time as events happen, which is what Predexon's always-on capture infrastructure does.
Yes — one normalized schema across venues. A backtest or research pipeline written against Predexon's Polymarket tick data runs on Kalshi data unchanged.
Backtests for event-contract strategies around economic releases, market-making and spread research, liquidity analysis across strike ladders, and academic studies of regulated event markets.
Tick-level orderbook history, the fastest WebSocket, and blockchain-indexed analytics for every major prediction market — through one clean, predictable API.