Kalshi KXB85 — B85 Historical Data
Every Kalshi “B85” contract of the day — every trade print and the complete Level-2 book, captured co-located with nanosecond venue and receive timestamps. 74 trading days as day bundles, €1 per day, bought as a guest with instant download.
B85 on Kalshi — activity
Trades and USD turnover summed over every contract of the series across 14 captured days to 2026-10-09, from the recorded tick data — the per-day averages divide by the captured days. Buy share, quoted spread (in contract price cents, 0..1 = 100 ¢), best-bid/ask depth and Level-2 update counts are turnover-weighted over the same window.
One purchase, the whole series for a day
A series-day bundle contains every B85 contract that was listed on Kalshi on that UTC day — traded or not — 11 contract files on the latest covered day. Each file carries the full raw feed: every trade print with price, size and side, plus Level-2 order-book updates, in the same zstd-compressed schema as our crypto venues. Event contracts quote 0..1; turnover is USD-normalized.
Coverage runs July 2026 – present — 74 trading days, 5.48 MB compressed in total. A day typically holds 22 contract files (up to 33 on the busiest day, 1.84 MB). Pick individual days in the shop calendar for €1 each; delivery is an instant per-file download or one archive for the whole day.
B85 — development since capture
0 trades and $0 of USD turnover over 15 captured days since 2026-09-22 — record day 2026-09-22 with $0, biggest single contract KXB85-SEP26-5.15 (B85 · 5.15) (2026-09-22, $0).
| Month | Days | Trades | Turnover (USD) | Avg / day | Contracts traded | L2 updates | vs previous month |
|---|---|---|---|---|---|---|---|
| Oct 2026 (month to date) | 8 | 0 | $0 | $0 | 0 | 6 | — |
| Sep 2026 | 7 | 0 | $0 | $0 | 0 | 5 | — |
Kalshi B85 — trades and USD turnover summed per calendar month (UTC) over every contract, from our own daily statistics of the recorded tick data. Days = captured UTC days; a partial month shows no month-over-month change. Contracts traded and L2 (order-book) updates exist for days captured with the extended statistics.
B85 — activity by weekday
Mondays carry the most turnover, about $0 per day.
| Weekday (UTC) | Avg turnover / day | USD | Avg trades | Days |
|---|---|---|---|---|
| Monday | $0 | 0 | 2 | |
| Tuesday | $0 | 0 | 3 | |
| Wednesday | $0 | 0 | 3 | |
| Thursday | $0 | 0 | 3 | |
| Friday | $0 | 0 | 3 | |
| Saturday | — | — | 0 | |
| Sunday | — | — | 0 |
Kalshi B85 — average USD turnover and trades per weekday over the captured days of the last 30, from our own daily statistics; weekdays without a captured day show —.
B85 — last 30 days in the archive
Files, size, contracts traded, trades, USD turnover, buy share, quoted spread, top-of-book depth and order-book updates per UTC day, from the recorded tick data.
| UTC day | Files | Size | Traded | Trades | Turnover | Buy share | Avg spread | Top-1 depth | L2 updates | Notes | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-10-21 | 11 | 11.7 KB | — | ≈ 0 | ≈ $0 | — | — | — | — | Buy day → | |
| 2026-10-20 | 11 | 10.1 KB | — | ≈ 0 | ≈ $0 | — | — | — | — | Buy day → | |
| 2026-10-19 | 11 | 9.35 KB | — | ≈ 0 | ≈ $0 | — | — | — | — | Buy day → | |
| 2026-10-16 | 11 | 10.2 KB | 0 | 0 | $0 | — | — | — | 1 | Buy day → | |
| 2026-10-15 | 11 | 10.0 KB | 0 | 0 | $0 | — | — | — | 1 | Buy day → | |
| 2026-10-14 | 11 | 9.97 KB | 0 | 0 | $0 | — | — | — | 1 | Buy day → | |
| 2026-10-13 | 11 | 9.93 KB | 0 | 0 | $0 | — | — | — | 0 | Buy day → | |
| 2026-10-09 | 11 | 10.1 KB | 0 | 0 | $0 | — | — | — | 1 | Buy day → | |
| 2026-10-08 | 11 | 10.1 KB | 0 | 0 | $0 | — | — | — | 1 | Buy day → | |
| 2026-10-07 | 11 | 9.91 KB | 0 | 0 | $0 | — | — | — | 1 | Buy day → | |
| 2026-10-06 | 11 | 9.30 KB | 0 | 0 | $0 | — | — | — | 0 | Buy day → | |
| 2026-10-05 | 11 | 9.93 KB | 0 | 0 | $0 | — | — | — | 1 | Buy day → | |
| 2026-10-02 | 11 | 10.5 KB | 0 | 0 | $0 | — | — | — | 1 | Buy day → | |
| 2026-10-01 | 11 | 10.9 KB | 0 | 0 | $0 | — | — | — | 1 | Buy day → | |
| 2026-09-30 | 11 | 10.2 KB | 0 | 0 | $0 | — | — | — | 1 | Buy day → | |
| 2026-09-29 | 11 | 9.98 KB | 0 | 0 | $0 | — | — | — | 0 | Buy day → | |
| 2026-09-28 | 11 | 9.43 KB | 0 | 0 | $0 | — | — | — | 1 | Buy day → | |
| 2026-09-25 | 11 | 11.3 KB | 0 | 0 | $0 | — | — | — | 1 | Buy day → | |
| 2026-09-24 | 11 | 10.0 KB | 0 | 0 | $0 | — | — | — | 1 | Buy day → | |
| 2026-09-23 | 11 | 10.4 KB | 0 | 0 | $0 | — | — | — | 1 | Buy day → | |
| 2026-09-22 | 11 | 9.37 KB | 0 | 0 | $0 | — | — | — | 0 | Buy day → | |
| 2026-09-21 | 11 | 9.49 KB | — | — | — | — | — | — | — | Buy day → | |
| 2026-09-18 | 11 | 10.4 KB | — | — | — | — | — | — | — | Buy day → | |
| 2026-09-17 | 11 | 10.0 KB | — | — | — | — | — | — | — | Buy day → | |
| 2026-09-16 | 11 | 10.0 KB | — | — | — | — | — | — | — | Buy day → | |
| 2026-09-15 | 11 | 10.2 KB | — | — | — | — | — | — | — | Buy day → | |
| 2026-09-14 | 11 | 9.58 KB | — | — | — | — | — | — | — | Buy day → | |
| 2026-09-11 | 11 | 10.2 KB | — | — | — | — | — | — | — | Buy day → | |
| 2026-09-10 | 11 | 10.0 KB | — | — | — | — | — | — | — | Buy day → | |
| 2026-09-09 | 11 | 9.46 KB | — | — | — | — | — | — | — | Buy day → |
≈ marks an estimate: the average of the last 7 captured days of this series, scaled by that day's contract-file count. Statistics for a day are captured the next morning UTC and replace the estimate; days that predate the capture show —. Traded = contracts with at least one trade that day. Buy share = taker-buy side of USD turnover. Avg spread = quoted bid-ask spread in contract price cents (0..1 = 100 ¢), weighted by turnover across the day’s contracts. Top-1 depth = mean of the best bid and best ask notional in USD, weighted by turnover. L2 updates = order-book level updates recorded across all contracts of the day. Days captured before the extended statistics show —.
Latest B85 contracts
The 11 largest B85 contract files recorded on 2026-10-21— every contract of the series is inside that day's bundle; single contracts can also be bought as individual day files. Per-contract trades, turnover and prices appear here once the daily statistics have captured this series.
- KXB85-SEP26-3.65 1.07 KB buy file →
- KXB85-SEP26-4.70 1.07 KB buy file →
- KXB85-SEP26-4.85 1.07 KB buy file →
- KXB85-SEP26-5.00 1.06 KB buy file →
- KXB85-SEP26-3.80 1.06 KB buy file →
- KXB85-SEP26-4.25 1.06 KB buy file →
- KXB85-SEP26-4.10 1.06 KB buy file →
- KXB85-SEP26-3.95 1.06 KB buy file →
- KXB85-SEP26-5.15 1.06 KB buy file →
- KXB85-SEP26-4.55 1.06 KB buy file →
- KXB85-SEP26-4.40 1.06 KB buy file →
Try a B85 contract file for free
The busiest contract of a settled day, byte-identical to the files in the paid bundle — download the native tick file, a CSV/Parquet export, or replay its order book in the browser.
KXB85-SEP26-5.15 minute by minute — 2026-10-14
One-minute open/high/low/close, trades, USD turnover, quoted spread and top-of-book depth of the sample contract — the same 1-minute statistics every instrument’s analytics page offers.
Build a B85 model on this data
Every B85 event lists a ladder of strikes — one contract per range — and the rung that settles in the money is the label, so the ladder's prices read as an implied distribution rather than one probability. The day bundle holds the full order-book path and trade tape of every rung, nanosecond-stamped; the statistics on this page cover the most traded contracts per day; the bundle holds every contract listed on Kalshi that day.
Split by release or event day, never at random — every rung of one ladder settles on the same print, so the whole ladder is one example; walk forward over releases. The ladder guide works distribution labels, cross-strike features and the link to the crypto strike grids through.
Purchased data is for your own use — backtesting, research, analytics and training your own models, in-house or in your own products; the trained models and derived data you build from it are yours. The raw files and tick streams themselves may not be redistributed, resold or published. The full terms are on the data license page.
Why buy Kalshi B85 data here
Four things every page on this site is built on — and the reason the numbers above exist at all.
We record everything
The complete public feed of each venue as it was published: every Level-2 snapshot and update at the venue's full book depth, every trade with its aggressor side, every quote, funding, mark-price and liquidation event — for every instrument the venue lists, every UTC day since we added the venue. Nothing sampled, no top-N cut, no on-demand capture.
Institutional grade
Captured co-located at the venue with the exchange timestamp and our receive timestamp in integer nanoseconds, an event-id chain that makes any gap visible, and one normalized schema across 35+ venues — the same capture our own high-frequency trading engine and enterprise feeds run on.
€1 per instrument-day
Any instrument-day is €1, series-day bundles start at €1 — no subscription, no minimum order, no tiers to unlock. Credit packs lower the effective price and never expire, and every venue has free full-day samples to test against first.
Self-service for everyone
Pick the days in the Data Shop, pay by card as a guest and download immediately — no sales call, no enterprise contract, no KYC. Coding agents buy the same files through the MCP server, and the free Agent Skill teaches them the format.
Agents: /llms.txt · MCP server /mcp · every page as markdown via Accept: text/markdown
Kalshi B85 data — FAQ
What Kalshi B85 data can I download?
Tick-by-tick trades and Level-2 order-book depth for every contract of the B85 series on Kalshi (11 contract files on the latest day). One bundle = one UTC day of the whole series.
What is the Kalshi series ticker for B85?
KXB85 — every contract of the series carries this prefix in its ticker (followed by the event date and strike). Files in a day bundle are named by the full contract ticker, so a bundle holds every KXB85-* contract listed that UTC day.
How far back does the B85 data go?
Coverage runs July 2026 – present — 74 trading days in total.
What format are the Kalshi files in?
One zstd-compressed text file per contract per UTC day, in the same normalized schema as our crypto venues — see the market-data specification; free samples on the downloads page.
Can I get Kalshi B85 data as CSV or Parquet?
Yes — trades export as gzipped CSV or Parquet at no extra cost, with integer microsecond UTC timestamps that load straight into pandas, polars or DuckDB. Kalshi records full order-book depth without a separate BBO stream, so book data ships in the native tick file — the free reader script converts it locally. See the formats overview.
How much does Kalshi B85 historical data cost?
€1 per series-day bundle — every contract of the series for that day — no subscription, no minimum order; buy as a guest in the Data Shop and download immediately. Credit packs lower the effective price and never expire.
Do I need an account or a sales call?
No. Pick the B85 series-days in the Data Shop, pay by card as a guest and download immediately — no subscription, no minimum order, no KYC, no enterprise contract, no sales call. Coding agents buy the same bundles through the MCP server.
How is the Kalshi B85 data captured?
Co-located at the venue, message by message: every Level-2 update and every trade print carries the exchange timestamp and our receive timestamp in integer nanoseconds, an event-id chain makes any gap visible, and one normalized schema across 35+ venues means a parser written for Binance reads these files unchanged. It is the same capture our own high-frequency trading engine runs on — nothing sampled, no top-N cut.
How many B85 contracts trade per day on Kalshi?
On average 0 B85 contracts had at least one trade per UTC day over the last 14 captured days on Kalshi, with about 0.79 order-book level updates recorded per day. A day bundle contains every contract file of the series for that day.
What was the busiest B85 trading day on Kalshi?
2026-09-22, with $0 of USD turnover over 0 trades across every B85 contract of the day; the busiest full month was Sep 2026 at $0. Since our statistics began on 2026-09-22 the series has recorded 0 trades and $0 over 15 captured days; the single biggest contract was KXB85-SEP26-5.15 (B85 · 5.15) on 2026-09-22 with $0. Any of these days is a downloadable bundle.