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kalshi historical data / elections / KXPRESOUTCOME
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2028 Presidential election: exact outcome, tick by tick.
Kalshi series KXPRESOUTCOME: order book and trades, 2026-09-27 → 2026-10-23.

The order-book and trade history of Kalshi's 2028 Presidential election: exact outcome series (a one-off event): top of book on every change, the 25-level book on every change in YES terms, every trade with the taker's side, and Kalshi's own ticker, with exchange timestamps to the millisecond. Captured by us from Kalshi's websocket on two independent legs and checked against the exchange's own book snapshots.

27 days2026-09-27 → 2026-10-23 · every day since its first · ~729 kB per day · 19 MB on disk · 32 open markets
pull KXPRESOUTCOME days →schemapricing

What a KXPRESOUTCOME day contains

Four parquet files per day, every market of the series in each. Sizes are this series' own averages over its 27 days on disk.

Top of book (every change)kalshi_l1

Best YES bid and ask with sizes and the spread, one row whenever either changed, derived tick by tick from the rebuilt book: not Kalshi's conflated ticker.

~35 kB per KXPRESOUTCOME day
Order book, 25 levels, every changekalshi_l2

The whole ladder after every book event, in YES terms (the NO bids become the asks, at their sizes), 25 levels a side: wide columns bid_px_1 … ask_sz_25, plus the exchange's own hourly snapshots. Each row is self-contained, so you can start reading mid-day.

~642 kB per KXPRESOUTCOME day
Tradeskalshi_trades

Every trade: YES and NO price, size in contracts, the taker's side, block-trade flag, trade id.

~9 kB per KXPRESOUTCOME day
Kalshi ticker (~1 s)kalshi_ticker

Kalshi's own ticker feed, about one update a second per market: last price, YES bid/ask with sizes, cumulative volume and open interest in contracts and dollars.

~43 kB per KXPRESOUTCOME day

KXPRESOUTCOME markets

The 12 closing nearest to now, from Kalshi's daily market list. Each is a row key (market_ticker) in every table, captured from the day it opens until it settles.

Will Andy Beshear defeat JD Vance in the 2028 presidential election, with Andy Beshear as the Democratic nominee and JD Vance as the Republican nominee?: Andy Beshear defeats JD VanceKXPRESOUTCOME-28NOV07-ABESJVANDcloses 2029-01-20 10:00 UTC
Will JD Vance defeat Andy Beshear in the 2028 presidential election, with Andy Beshear as the Democratic nominee and JD Vance as the Republican nominee?: JD Vance defeats Andy BeshearKXPRESOUTCOME-28NOV07-ABESJVANRcloses 2029-01-20 10:00 UTC
Will Andy Beshear defeat Marco Rubio in the 2028 presidential election, with Andy Beshear as the Democratic nominee and Marco Rubio as the Republican nominee?: Andy Beshear defeats Marco RubioKXPRESOUTCOME-28NOV07-ABESMRUBDcloses 2029-01-20 10:00 UTC
Will Marco Rubio defeat Andy Beshear in the 2028 presidential election, with Andy Beshear as the Democratic nominee and Marco Rubio as the Republican nominee?: Marco Rubio defeats Andy BeshearKXPRESOUTCOME-28NOV07-ABESMRUBRcloses 2029-01-20 10:00 UTC
Will Alexandria Ocasio-Cortez defeat JD Vance in the 2028 presidential election, with Alexandria Ocasio-Cortez as the Democratic nominee and JD Vance as the Republican nominee?: AOC defeats JD VanceKXPRESOUTCOME-28NOV07-AOCJVANDcloses 2029-01-20 10:00 UTC
Will JD Vance defeat Alexandria Ocasio-Cortez in the 2028 presidential election, with Alexandria Ocasio-Cortez as the Democratic nominee and JD Vance as the Republican nominee?: JD Vance defeats AOCKXPRESOUTCOME-28NOV07-AOCJVANRcloses 2029-01-20 10:00 UTC
Will Alexandria Ocasio-Cortez defeat Marco Rubio in the 2028 presidential election, with Alexandria Ocasio-Cortez as the Democratic nominee and Marco Rubio as the Republican nominee?: AOC defeats Marco RubioKXPRESOUTCOME-28NOV07-AOCMRUBDcloses 2029-01-20 10:00 UTC
Will Marco Rubio defeat Alexandria Ocasio-Cortez in the 2028 presidential election, with Alexandria Ocasio-Cortez as the Democratic nominee and Marco Rubio as the Republican nominee?: Marco Rubio defeats AOCKXPRESOUTCOME-28NOV07-AOCMRUBRcloses 2029-01-20 10:00 UTC
Will Gavin Newsom defeat JD Vance in the 2028 presidential election, with Gavin Newsom as the Democratic nominee and JD Vance as the Republican nominee?: Gavin Newsom defeats JD VanceKXPRESOUTCOME-28NOV07-GNEWJVANDcloses 2029-01-20 10:00 UTC
Will JD Vance defeat Gavin Newsom in the 2028 presidential election, with Gavin Newsom as the Democratic nominee and JD Vance as the Republican nominee?: JD Vance defeats Gavin NewsomKXPRESOUTCOME-28NOV07-GNEWJVANRcloses 2029-01-20 10:00 UTC
Will Gavin Newsom defeat Marco Rubio in the 2028 presidential election, with Gavin Newsom as the Democratic nominee and Marco Rubio as the Republican nominee?: Gavin Newsom defeats Marco RubioKXPRESOUTCOME-28NOV07-GNEWMRUBDcloses 2029-01-20 10:00 UTC
Will Marco Rubio defeat Gavin Newsom in the 2028 presidential election, with Gavin Newsom as the Democratic nominee and Marco Rubio as the Republican nominee?: Marco Rubio defeats Gavin NewsomKXPRESOUTCOME-28NOV07-GNEWMRUBRcloses 2029-01-20 10:00 UTC

Coverage notes for KXPRESOUTCOME

  • First day on disk: 2026-09-27. That is the day our Kalshi capture began, not the series' launch. New days are added daily.
  • Trades before 2026-09-27. Kalshi's historical API has no tick-level order book, so earlier KXPRESOUTCOME trades are in the whole-exchange trades history (from 2021-06-30, one file a day): filter market_ticker to this series' markets, which start with KXPRESOUTCOME-.
  • The first day starts at 11:00 UTC. Our capture began at 11:00 UTC on 27 September 2026: 13 hours that day, not 24, and no CF Benchmarks index file (that capture starts on the 28th).
  • A book-quality dip on 2026-09-29. During a pipeline cutover 10,255 exchange snapshots disagreed with the rebuilt book (41 to 1,378 on every other day) and 16,678 negative levels were clamped to zero. The book resynchronises at every exchange snapshot; trades and ticker are unaffected.
  • Every bundle ships a README with the schemas and, per day, how often the rebuilt book matched the exchange's own snapshots, for your exact range.

Pricing

A month of KXPRESOUTCOME, every table, is about 21 MB. Bought for Kalshi, Starter ($29/mo) carries top of book, trades and the ticker for every series plus one series of your choice, KXPRESOUTCOME if you like, at full book depth; L10 ($49/mo) carries every series' book at 10 levels and L25 ($99/mo) the full 25-level book. Each includes 7 days before you join and every day after. Any free account can pull 2026-10-07, any series, up to 1.0 GB.

Starter: KXPRESOUTCOME at full depth →L10: every series at 10 levelsL25: every series, 25 levelsfree sample day

Other elections series on Kalshi

House Race Winner?Midterm margin of victoryVote percentages in US general electionsMichigan Senate-Governor ComboMidterm Voter TurnoutHow many seats will party win in state?2028 D runningWorld leaders out this year?Who will win the Vancouver mayoral election?State legislature winnersWhich state ballot measures will pass?Democratic Primary winner2028 R runningDemocratic VP nomCounty vote percentagesDemocratic House seatsGeneral election county winnersclosest governor's raceMinnesota GovernorRepublican house seats… the whole venue