---
license: other
pretty_name: Kalshi Live Orderbook Alpha Feed
tags:
- finance
- prediction-markets
- order-book
- time-series
---

# Kalshi Live Orderbook Alpha Feed

This public dataset contains live Kalshi order-book snapshots and derived state
after every `orderbook_delta` message for a research universe refreshed every
10 minutes.

The current universe is the 200 highest-volume open markets over a rolling
48-hour public-trade window. It is spread by volume across four websocket
connections of 50 markets each, then periodically rebalanced using observed
per-market delta traffic.

Early files used an expanded allowlist/blocklist union. Per-record
`selection_sources` and `universe` records identify that historical scope.

## Files

Data is stored as gzip-compressed JSON Lines under
`data/YYYY/MM/DD/kalshi_orderbooks_*.jsonl.gz`. Files are uploaded only after
they are closed and compressed.

`schema_version=1` records have one of three `record_type` values:

- `snapshot`: the initial full YES and NO bid ladders plus derived features.
- `delta`: the raw changed side, price, and quantity plus derived state after
  applying the delta.
- `universe`: the selected ticker universe and selection reason at a discovery
  boundary.

For both YES and NO, `book` contains the top three displayed bid levels, the
top three asks derived from the opposite outcome's bids, and the best bid and
ask whose displayed level quantity is strictly greater than 1,000 contracts.
Prices are in cents and quantities can be fractional.

Timestamps include local receipt nanoseconds, Kalshi's exchange timestamp when
present, and their observed difference. Network, scheduling, and processing
latency mean the feed is not a colocated ground-truth record.

This is public market-data collection for research, not investment advice.