Tick-by-tick trades and L2 order-book depth for 10 World Series & MLB Playoffs series on Kalshi — World Series winner (KXMLB), AL and NL Championship, playoff qualifiers, playoff matchups, best record, longest winning streak. 1,683 series-days covering March 2026 – September 2026; 109.3K trades · $1.6M turnover in the 30 days to 2026-09-02. Sold as day bundles from €1.
World Series winner, AL/NL pennants, playoff qualifiers and matchups, best and worst records, win/loss streaks.
Every series below is archived at full feed resolution — each contract file carries every trade print (price, size, side) and Level-2 order-book updates in one normalized, zstd-compressed schema. A series-day bundle holds all contracts of the series for one UTC day.
Ranked by USD turnover from our own daily statistics — the series a market maker or bot builder should start with.
| # | Series | Venue | Trades (30d) | Turnover (30d) | Days | |
|---|---|---|---|---|---|---|
| 1 | World Series | Kalshi | 67,136 | $750.9K | 23 | Buy days |
| 2 | Pro Baseball Playoff Qualifiers | Kalshi | 14,847 | $547.6K | 23 | Buy days |
| 3 | MLB American League Championship | Kalshi | 8,614 | $118.4K | 23 | Buy days |
| 4 | MLB National League Championship | Kalshi | 6,413 | $100.8K | 23 | Buy days |
| 5 | Pro Baseball Best Record (KXMLBBESTRECORD) | Kalshi | 4,336 | $38.2K | 23 | Buy days |
| 6 | Teams in MLB Finals | Kalshi | 5,600 | $19.1K | 30 | Buy days |
| 7 | Pro Baseball Best Record (KXMLBWORSTRECORD) | Kalshi | 2,087 | $17.8K | 23 | Buy days |
| 8 | Longest Losing Streak | Kalshi | 175 | $1.9K | 23 | Buy days |
| 9 | Longest Winning Streak | Kalshi | 92 | $818.48 | 23 | Buy days |
| 10 | Pro Baseball Playoff Matchups | Kalshi | 8 | $50.75 | 15 | Buy days |
Trades and USD turnover summed over every contract of the series, from the recorded tick data; 30 days to 2026-09-02. Series without statistics in the window are omitted.
Largest archive first. Each series page lists its exact coverage, day count and recent days; day bundles are bought in the shop calendar.
| Series | Venue | Interval | Days | Coverage | Size | Price/day | |
|---|---|---|---|---|---|---|---|
| World Series | Kalshi | event | 185 | March 2026 – September 2026 | 3.08 GB | €1 | Buy days |
| Pro Baseball Playoff Qualifiers | Kalshi | annual | 185 | March 2026 – September 2026 | 1.21 GB | €1 | Buy days |
| Teams in MLB Finals | Kalshi | event | 185 | March 2026 – September 2026 | 1.13 GB | €1 | Buy days |
| MLB American League Championship | Kalshi | annual | 185 | March 2026 – September 2026 | 768 MB | €1 | Buy days |
| MLB National League Championship | Kalshi | annual | 185 | March 2026 – September 2026 | 543 MB | €1 | Buy days |
| Pro Baseball Best Record (KXMLBBESTRECORD) | Kalshi | annual | 185 | March 2026 – September 2026 | 257 MB | €1 | Buy days |
| Pro Baseball Best Record (KXMLBWORSTRECORD) | Kalshi | annual | 185 | March 2026 – September 2026 | 237 MB | €1 | Buy days |
| Pro Baseball Playoff Matchups | Kalshi | event | 18 | August 2026 – September 2026 | 233 MB | €1 | Buy days |
| Longest Winning Streak | Kalshi | event | 185 | March 2026 – September 2026 | 185 MB | €1 | Buy days |
| Longest Losing Streak | Kalshi | event | 185 | March 2026 – September 2026 | 97.1 MB | €1 | Buy days |
Yes — KXMLB is the season-long World Series winner series; AL/NL Championship, playoff qualifiers, playoff matchups, best/worst record and streak series sit beside it. Each day of the season is one bundle day.
One purchase covers every contract of a series for one UTC day — tick-by-tick trades plus Level-2 order-book updates per contract — typically €1 per series-day.
Coverage runs March 2026 – September 2026 — 1,683 series-days across 10 series on Kalshi. Each series page lists its exact span.
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.
Typically €1 per series-day bundle — every contract of the series for that UTC day, with invoice on checkout. Pick days in the shop calendar.