TrevorJS/kalshi-trades

Kalshi Prediction Market Trades & Markets

Complete public trade-level and market-level data from Kalshi, the first CFTC-regulated prediction market exchange in the United States.

Dataset Summary

	Count	Timespan
Trades	154,505,005	June 2021 – January 2026
Markets	17,464,713	June 2021 – January 2026
Events	4,721,915
Total contracts traded	34.6 billion

Data Files

trades/

16 parquet shards (~10M rows each), sorted by created_time.

Column	Type	Description
trade_id	string	Unique trade identifier
ticker	string	Market ticker (joins to markets.ticker)
count	int64	Number of contracts in the trade
yes_price	int64	Price of YES contracts (1–99 cents)
no_price	int64	Price of NO contracts (1–99 cents)
taker_side	string	Side the taker bought: yes or no
created_time	timestamp[us, UTC]	When the trade occurred

markets/

4 parquet shards (~5M rows each).

Column	Type	Description
ticker	string	Unique market ticker
event_ticker	string	Parent event ticker (groups related markets)
market_type	string	Market type (e.g. binary)
title	string	Human-readable market title
yes_sub_title	string	Label for the YES side
no_sub_title	string	Label for the NO side
status	string	Market status: settled, closed, active, etc.
yes_bid	int64	Best YES bid at time of fetch
yes_ask	int64	Best YES ask at time of fetch
no_bid	int64	Best NO bid at time of fetch
no_ask	int64	Best NO ask at time of fetch
last_price	int64	Last traded price
volume	int64	Lifetime volume (contracts)
volume_24h	int64	24-hour volume
open_interest	int64	Open interest
result	string	Resolution: yes, no, or empty if unresolved
created_time	timestamp	When the market was created
open_time	timestamp	When the market opened for trading
close_time	timestamp	When the market closed

Usage

from datasets import load_dataset

ds = load_dataset("TrevorJS/kalshi-trades")

# or with DuckDB
import duckdb
con = duckdb.connect()
con.execute("SELECT * FROM 'hf://datasets/TrevorJS/kalshi-trades/trades/*.parquet' LIMIT 10")

Data Quality

• 0 duplicate trades (21,950 duplicates removed during cleaning)
• 0 null trade IDs or prices
• 100% trade-to-market join coverage (64 orphan tickers with no API-available market record were removed; 1,258 trades dropped, <0.001% of dataset)
• All timestamps are UTC

Provenance

Trade data was collected from the Kalshi public API. Market metadata was backfilled using the /markets batch ticker endpoint. The dataset combines data originally collected by Andrew Becker (June 2021 – November 2025) with an incremental update through January 2026.

Acknowledgments

• Andrew Becker for the original kalshi_trades dataset and collection infrastructure
• Kalshi for providing a public API

License

CC-BY-4.0