Tick-by-tick trades and L2 order-book depth for 107 MLB & Baseball series on Kalshi & Polymarket — MLB game winners, spreads and totals, hits/home-run/strikeout props, first-5-innings lines, KBO and NPB. 13,640 series-days covering May 2025 – September 2026; 18.4M trades · $1.4B turnover in the 30 days to 2026-09-02. Sold as day bundles from €1.
MLB game winners, run lines, totals, first-5-innings lines, player props, season leaders — plus KBO, NPB, LMB and college baseball.
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 | Professional Baseball Game | Kalshi | 7,590,860 | $716.1M | 28 | Buy days |
| 2 | Pro Baseball Total Points | Kalshi | 3,125,472 | $238.3M | 28 | Buy days |
| 3 | MLB (games & props) | Polymarket | 863,810 | $150.4M | 30 | Buy days |
| 4 | Pro Baseball Spread | Kalshi | 1,552,782 | $117.2M | 28 | Buy days |
| 5 | Pro Baseball Run in First Inning | Kalshi | 974,793 | $69.6M | 28 | Buy days |
| 6 | First 5 Innings Total | Kalshi | 523,862 | $27.6M | 28 | Buy days |
| 7 | First 5 Innings Winner | Kalshi | 510,298 | $20.5M | 28 | Buy days |
| 8 | Pro Baseball Strikeouts | Kalshi | 504,542 | $17.4M | 28 | Buy days |
| 9 | Pro Baseball Team Total | Kalshi | 384,600 | $16.3M | 28 | Buy days |
| 10 | Pro Baseball Home Runs | Kalshi | 789,807 | $13.0M | 28 | 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.
| Venue | Series | With stats | Trades (30d) | Turnover (30d) |
|---|---|---|---|---|
| Kalshi | 103 | 43 | 17,518,728 | $1.3B |
| Polymarket | 4 | 1 | 863,810 | $150.4M |
30 days to 2026-09-02, from our own daily statistics per contract.
From the live prediction-movers snapshot (contracts of this topic's series only, settled markets filtered). Intraday — not part of the archived dataset.
| Contract | Venue | Price 24h ago → now | Δ | 24h turnover |
|---|---|---|---|---|
| KXMLBRFI-26SEP031235SFPIT | Kalshi | 0.43 → 0.51 | +0.08 | $11.4K |
| KXMLBGAME-26SEP031915MILCHC-CHC | Kalshi | 0.51 → 0.49 | -0.02 | $16.8K |
| KXMLBGAME-26SEP031310TORCLE-CLE | Kalshi | 0.53 → 0.51 | -0.02 | $41.4K |
| KXMLBNLCY-26-JMIS | Kalshi | 0.87 → 0.85 | -0.02 | $11.0K |
Live contracts ranked by absolute 24-hour price change (contracts quote 0..1; settled or near-settled contracts excluded). Snapshot 2026-09-03 13:24 UTC. Full list in the prediction movers.
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 | |
|---|---|---|---|---|---|---|---|
| Pro Baseball Total Points | Kalshi | event | 163 | March 2026 – September 2026 | 54.5 GB | €1 | Buy days |
| Pro Baseball Spread | Kalshi | event | 163 | March 2026 – September 2026 | 38.1 GB | €1 | Buy days |
| Professional Baseball Game | Kalshi | event | 189 | February 2026 – September 2026 | 34.9 GB | €1 | Buy days |
| Pro Baseball Team Total | Kalshi | event | 154 | March 2026 – September 2026 | 28.4 GB | €1 | Buy days |
| First 5 Innings Total | Kalshi | event | 161 | March 2026 – September 2026 | 14.8 GB | €1 | Buy days |
| First 5 Innings Winner | Kalshi | event | 163 | March 2026 – September 2026 | 14.6 GB | €1 | Buy days |
| Japan NPB Game | Kalshi | event | 158 | March 2026 – September 2026 | 10.2 GB | €1 | Buy days |
| Pro Baseball Hits | Kalshi | event | 161 | March 2026 – September 2026 | 9.86 GB | €1 | Buy days |
| Pro Baseball Hits Runs RBIs | Kalshi | event | 161 | March 2026 – September 2026 | 9.50 GB | €1 | Buy days |
| KBO Game | Kalshi | event | 155 | March 2026 – September 2026 | 9.12 GB | €1 | Buy days |
| First 5 Innings Spread | Kalshi | event | 161 | March 2026 – September 2026 | 8.77 GB | €1 | Buy days |
| Pro Baseball Total Bases | Kalshi | event | 161 | March 2026 – September 2026 | 7.93 GB | €1 | Buy days |
| Pro Baseball Home Runs | Kalshi | event | 161 | March 2026 – September 2026 | 6.92 GB | €1 | Buy days |
| Pro Baseball Strikeouts | Kalshi | event | 161 | March 2026 – September 2026 | 4.64 GB | €1 | Buy days |
| First 7 Innings Winner | Kalshi | event | 63 | June 2026 – September 2026 | 3.75 GB | €1 | Buy days |
| First 3 Innings Winner | Kalshi | event | 63 | June 2026 – September 2026 | 3.34 GB | €1 | Buy days |
| Pro Baseball Spring Training game | Kalshi | event | 28 | February 2026 – March 2026 | 3.19 GB | €1 | Buy days |
| College Baseball Game | Kalshi | event | 112 | February 2026 – June 2026 | 3.07 GB | €1 | Buy days |
| World Series | Kalshi | event | 183 | March 2026 – September 2026 | 3.05 GB | €1 | Buy days |
| Pro Baseball Run in First Inning | Kalshi | event | 163 | March 2026 – September 2026 | 2.99 GB | €1 | Buy days |
| Mexican Baseball League | Kalshi | event | 65 | June 2026 – September 2026 | 2.52 GB | €1 | Buy days |
| Pro Baseball RBIs | Kalshi | event | 71 | June 2026 – September 2026 | 2.26 GB | €1 | Buy days |
| Point Total (KXNPBTOTAL) | Kalshi | event | 49 | July 2026 – September 2026 | 2.05 GB | €1 | Buy days |
| MLB Season Wins | Kalshi | annual | 183 | March 2026 – September 2026 | 2.05 GB | €1 | Buy days |
| KBO Total Runs | Kalshi | event | 108 | May 2026 – September 2026 | 1.46 GB | €1 | Buy days |
| KBO Spread | Kalshi | event | 108 | May 2026 – September 2026 | 1.32 GB | €1 | Buy days |
| NPB Spread | Kalshi | event | 49 | July 2026 – September 2026 | 1.29 GB | €1 | Buy days |
| Pro Baseball Playoff Qualifiers | Kalshi | annual | 183 | March 2026 – September 2026 | 1.17 GB | €1 | Buy days |
| Teams in MLB Finals | Kalshi | event | 183 | March 2026 – September 2026 | 1.10 GB | €1 | Buy days |
| Pro Baseball Stolen Bases | Kalshi | event | 70 | June 2026 – September 2026 | 779 MB | €1 | Buy days |
| MLB American League Championship | Kalshi | annual | 183 | March 2026 – September 2026 | 746 MB | €1 | Buy days |
| Pro Baseball Outs Recorded | Kalshi | event | 71 | June 2026 – September 2026 | 729 MB | €1 | Buy days |
| MLB Extra Innings | Kalshi | event | 111 | May 2026 – September 2026 | 677 MB | €1 | Buy days |
| MLB National League Championship | Kalshi | annual | 183 | March 2026 – September 2026 | 522 MB | €1 | Buy days |
| Pro Baseball Inning Win | Kalshi | event | 13 | August 2026 – September 2026 | 484 MB | €1 | Buy days |
| World Baseball Classic Game | Kalshi | event | 15 | March 2026 | 378 MB | €1 | Buy days |
| Pro Baseball American League Cy Young | Kalshi | annual | 183 | March 2026 – September 2026 | 316 MB | €1 | Buy days |
| MLB Player Next Team | Kalshi | event | 122 | March 2026 – September 2026 | 311 MB | €1 | Buy days |
| Pro Baseball Season Home Runs | Kalshi | event | 162 | March 2026 – September 2026 | 294 MB | €1 | Buy days |
| Pro Baseball Earned Runs | Kalshi | event | 17 | August 2026 – September 2026 | 290 MB | €1 | Buy days |
| Pro Baseball National League Cy Young | Kalshi | annual | 183 | March 2026 – September 2026 | 266 MB | €1 | Buy days |
| Pro Baseball Hits Allowed | Kalshi | event | 17 | August 2026 – September 2026 | 264 MB | €1 | Buy days |
| Pro Baseball Best Record (KXMLBBESTRECORD) | Kalshi | annual | 183 | March 2026 – September 2026 | 245 MB | €1 | Buy days |
| Pro Baseball Inning Total | Kalshi | event | 13 | August 2026 – September 2026 | 242 MB | €1 | Buy days |
| Pro Baseball Walks | Kalshi | event | 17 | August 2026 – September 2026 | 241 MB | €1 | Buy days |
| Pro Baseball American League Rookie of the Year | Kalshi | annual | 183 | March 2026 – September 2026 | 236 MB | €1 | Buy days |
| Pro Baseball Best Record (KXMLBWORSTRECORD) | Kalshi | annual | 183 | March 2026 – September 2026 | 220 MB | €1 | Buy days |
| Pro Baseball Playoff Matchups | Kalshi | event | 16 | August 2026 – September 2026 | 199 MB | €1 | Buy days |
| Pro Baseball National League Rookie of the Year | Kalshi | annual | 183 | March 2026 – September 2026 | 186 MB | €1 | Buy days |
| Longest Winning Streak | Kalshi | event | 183 | March 2026 – September 2026 | 180 MB | €1 | Buy days |
| Pro Baseball National League MVP | Kalshi | annual | 183 | March 2026 – September 2026 | 180 MB | €1 | Buy days |
| Pro Baseball American League MVP | Kalshi | annual | 183 | March 2026 – September 2026 | 178 MB | €1 | Buy days |
| KBO First Inning Run | Kalshi | event | 108 | May 2026 – September 2026 | 151 MB | €1 | Buy days |
| Pro Baseball American League Hank Aaron (KXMLBNLHAARON) | Kalshi | annual | 183 | March 2026 – September 2026 | 133 MB | €1 | Buy days |
| Pro Baseball Debut | Kalshi | event | 117 | May 2026 – September 2026 | 127 MB | €1 | Buy days |
| MLB Home Runs Leader | Kalshi | annual | 183 | March 2026 – September 2026 | 120 MB | €1 | Buy days |
| MLB Wins Leader | Kalshi | annual | 183 | March 2026 – September 2026 | 120 MB | €1 | Buy days |
| Pro Baseball National League Manager of the Year | Kalshi | annual | 183 | March 2026 – September 2026 | 118 MB | €1 | Buy days |
| College Baseball Champion | Kalshi | event | 112 | March 2026 – June 2026 | 112 MB | €1 | Buy days |
| Longest Losing Streak | Kalshi | event | 183 | March 2026 – September 2026 | 96.0 MB | €1 | Buy days |
| Pro Baseball American League Hank Aaron (KXMLBALHAARON) | Kalshi | annual | 183 | March 2026 – September 2026 | 94.3 MB | €1 | Buy days |
| Pro Baseball American League Manager of the Year | Kalshi | annual | 183 | March 2026 – September 2026 | 90.5 MB | €1 | Buy days |
| MLB Steals Leader | Kalshi | annual | 183 | March 2026 – September 2026 | 86.2 MB | €1 | Buy days |
| World Baseball Classic Total | Kalshi | event | 15 | March 2026 | 80.5 MB | €1 | Buy days |
| Pro Baseball Trades | Kalshi | event | 121 | April 2026 – August 2026 | 80.2 MB | €1 | Buy days |
| Pro Baseball Team Stat | Kalshi | event | 87 | June 2026 – September 2026 | 78.8 MB | €1 | Buy days |
| MLB Runs Leader | Kalshi | annual | 183 | March 2026 – September 2026 | 75.2 MB | €1 | Buy days |
| MLB RBIs Leader | Kalshi | annual | 183 | March 2026 – September 2026 | 74.9 MB | €1 | Buy days |
| MLB Hits Leader | Kalshi | annual | 183 | March 2026 – September 2026 | 73.5 MB | €1 | Buy days |
| MLB Batting Average Leader | Kalshi | annual | 183 | March 2026 – September 2026 | 72.8 MB | €1 | Buy days |
| World Baseball Classic Spread | Kalshi | event | 15 | March 2026 | 72.8 MB | €1 | Buy days |
| MLB Doubles Leader | Kalshi | annual | 183 | March 2026 – September 2026 | 68.5 MB | €1 | Buy days |
| Pro Baseball Next Team | Kalshi | event | 42 | July 2026 – September 2026 | 62.8 MB | €1 | Buy days |
| MLB ERA Leader | Kalshi | annual | 183 | March 2026 – September 2026 | 56.8 MB | €1 | Buy days |
| College Baseball Playoff Qualifiers | Kalshi | event | 54 | April 2026 – June 2026 | 52.9 MB | €1 | Buy days |
| Next Manager (KXNEXTMANAGERMLB) | Kalshi | event | 130 | April 2026 – September 2026 | 49.5 MB | €1 | Buy days |
| Pro Baseball Draft Pick | Kalshi | event | 65 | May 2026 – July 2026 | 47.6 MB | €1 | Buy days |
| Pro Baseball American League Comeback Player of the Year | Kalshi | annual | 183 | March 2026 – September 2026 | 46.2 MB | €1 | Buy days |
| Pro Baseball Season Stat (KXMLBSTATCOUNT) | Kalshi | event | 177 | March 2026 – September 2026 | 45.2 MB | €1 | Buy days |
| MLB WAR Leader | Kalshi | annual | 183 | March 2026 – September 2026 | 44.0 MB | €1 | Buy days |
| Pro Baseball All-Stars | Kalshi | event | 43 | June 2026 – July 2026 | 43.7 MB | €1 | Buy days |
| All Star Game Hits | Kalshi | event | 2 | July 2026 | 41.9 MB | €1 | Buy days |
| MLB OPS Leader | Kalshi | annual | 183 | March 2026 – September 2026 | 38.3 MB | €1 | Buy days |
| Baseball Managers Out | Kalshi | event | 139 | April 2026 – September 2026 | 35.6 MB | €1 | Buy days |
| MLB Triples Leader | Kalshi | annual | 183 | March 2026 – September 2026 | 33.7 MB | €1 | Buy days |
| Pro Baseball Strikeouts Leader | Kalshi | event | 150 | April 2026 – September 2026 | 31.5 MB | €1 | Buy days |
| Home Run Derby Finals Forecast | Kalshi | event | 2 | July 2026 | 30.5 MB | €1 | Buy days |
| Pro Baseball Player of the Month | Kalshi | event | 110 | April 2026 – August 2026 | 30.0 MB | €1 | Buy days |
| Pro Baseball Pitcher of the Month | Kalshi | event | 110 | April 2026 – August 2026 | 29.8 MB | €1 | Buy days |
| College Baseball Golden Spikes Award | Kalshi | event | 119 | March 2026 – June 2026 | 28.2 MB | €1 | Buy days |
| Pro Baseball Season Stat (KXMLBSTAT) | Kalshi | event | 183 | March 2026 – September 2026 | 27.2 MB | €1 | Buy days |
| Pro Baseball Gold Glove | Kalshi | event | 57 | July 2026 – September 2026 | 26.2 MB | €1 | Buy days |
| National League Comeback Player of the Year | Kalshi | annual | 183 | March 2026 – September 2026 | 26.0 MB | €1 | Buy days |
| Pro Baseball Executive of the Year | Kalshi | event | 183 | March 2026 – September 2026 | 24.7 MB | €1 | Buy days |
| Pro Baseball National League Reliever of the Year | Kalshi | annual | 183 | March 2026 – September 2026 | 23.2 MB | €1 | Buy days |
| College Baseball Conference Tournament | Kalshi | event | 7 | May 2026 | 22.5 MB | €1 | Buy days |
| Pro Baseball American League Reliever of the Year | Kalshi | annual | 183 | March 2026 – September 2026 | 22.1 MB | €1 | Buy days |
| Pro Baseball Top Pick | Kalshi | event | 65 | May 2026 – July 2026 | 19.5 MB | €1 | Buy days |
| Pro Baseball Silver Slugger | Kalshi | annual | 58 | July 2026 – September 2026 | 16.7 MB | €1 | Buy days |
| Pro Baseball Award Finalists | Kalshi | event | 28 | August 2026 – September 2026 | 13.1 MB | €1 | Buy days |
| NPB Champion | Kalshi | event | 140 | April 2026 – September 2026 | 11.7 MB | €1 | Buy days |
| First 5 Innings Total (KXWBCF5TOTAL) | Kalshi | event | 15 | March 2026 | 2.95 MB | €1 | Buy days |
| All Star Game Strikesouts | Kalshi | event | 2 | July 2026 | 1.82 MB | €1 | Buy days |
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 | |
|---|---|---|---|---|---|---|---|
| MLB (games & props) | Polymarket | event | 357 | May 2025 – September 2026 | 111 GB | €1 | Buy days |
| KBO Baseball (games & props) | Polymarket | event | 189 | October 2025 – September 2026 | 6.48 GB | €1 | Buy days |
| NPB Baseball (games & props) | Polymarket | event | 71 | June 2026 – September 2026 | 3.17 GB | €1 | Buy days |
| MLB 2026 Regular Season Win Totals | Polymarket | annual | 184 | March 2026 – September 2026 | 494 MB | €1 | Buy days |
Yes — game winners (KXMLBGAME is one of the most-traded Kalshi sports series), spreads, totals, first-3/5/7-innings lines, team totals, player props (hits, home runs, RBIs, total bases, strikeouts, stolen bases), season leaders, awards and World Series markets. Polymarket MLB games and props are one family.
Yes — Kalshi KBO and NPB spreads and totals, the Mexican League (LMB), the World Baseball Classic and college baseball games are listed as their own series.
Coverage runs May 2025 – September 2026 — 13,640 series-days across 107 series on Kalshi & Polymarket. 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. Both venues record 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.