Costco KPI is a one-time financials series on Kalshi, with markets like “Will Costco Wholesale Corporation report Above 152.8 million total cardholders in Q1 2027?”. The Kalshi Eye archive lists 10 of its markets and has 13 days of daily Parquet files from October 12, 2026 to October 24, 2026 (417 KB), with every order book change and trade.

Venue: Kalshi, series KXCOST
Category: Financials, one-time
Markets: 10 (0 settled, 10 open)
Files: 13 days, October 12, 2026 to October 24, 2026, 417 KB, 38,605 rows
Datasets: Order book (L2, incremental), Order book snapshots (top 10, 1 second), Top of book (every change), Top of book (1-minute bars), Trades

Open Costco KPI in Markets to see every day and market, then export the days you need. Free sample files of each dataset are on the Kalshi data page.

Reading the files

Every KXCOST trade on October 24, 2026, in DuckDB:

SELECT ts_recv, ticker, yes_price, size, taker_side
FROM 'kalshieye-data/trades/date=2026-10-24/series=KXCOST/trades-KXCOST-2026-10-24.parquet'
ORDER BY ts_recv;

To test a strategy on this series, see How to backtest Kalshi markets.

Related Kalshi series

Tesla KPI (KXTSLA): 84 markets, 13 days of files
Sea Limited KPI (KXSE): 34 markets, 13 days of files
Mercado Libre KPI (KXMELIA): 33 markets, 13 days of files
Talen Energy KPI (KXTLN): 33 markets, 13 days of files
Costco Foot Traffic (KXCOSTFT): 31 markets, 13 days of files
Costco Credit Card Spend (KXCOSTCC): 29 markets, 13 days of files

Figures through October 24, 2026. All Kalshi series with pages are listed on Kalshi series.