MLB & Baseball Prediction Market Data
Tick-by-tick trades and L2 order-book depth for 115 MLB & Baseball series on Kalshi & OG.com & Polymarket & predict.fun — MLB game winners, spreads and totals, hits/home-run/strikeout props, first-5-innings lines, KBO and NPB. 18,419 series-days covering May 2025 – present; 6.7M trades · $404.8M turnover over the last 30 captured days. Every contract captured co-located with nanosecond venue and receive timestamps — sold as day bundles, €1 per day, bought as a guest with instant download.
MLB & Baseball on Kalshi & OG.com & Polymarket & predict.fun
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.
Most traded MLB & Baseball series (last 30 days)
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 | 3,222,932 | $243.5M | 26 | Buy days |
| 2 | Pro Baseball Total Points | Kalshi | 422,393 | $34.5M | 26 | Buy days |
| 3 | MLB (games & props) | Polymarket | 89,291 | $21.5M | 26 | Buy days |
| 4 | Pro Baseball Spread | Kalshi | 390,491 | $20.1M | 26 | Buy days |
| 5 | World Series | Kalshi | 278,834 | $9.5M | 30 | Buy days |
| 6 | MLB (games & props) | OG.com | 146,368 | $8.6M | 24 | Buy days |
| 7 | Pro Baseball Run in First Inning | Kalshi | 132,428 | $8.2M | 26 | Buy days |
| 8 | First 5 Innings Total | Kalshi | 97,001 | $6.5M | 26 | Buy days |
| 9 | Pro Baseball Strikeouts | Kalshi | 184,708 | $5.7M | 26 | Buy days |
| 10 | First 5 Innings Winner | Kalshi | 89,483 | $5.5M | 26 | Buy days |
Trades and USD turnover summed over every contract of the series, from the recorded tick data; 30 days to 2026-11-02. Series without statistics in the window are omitted.
MLB & Baseball activity per venue
| Venue | Series | With stats | Trades (30d) | Turnover (30d) |
|---|---|---|---|---|
| Kalshi | 108 | 67 | 6,402,953 | $373.4M |
| Polymarket | 4 | 3 | 97,339 | $22.0M |
| OG.com | 1 | 1 | 146,368 | $8.6M |
| predict.fun | 2 | 2 | 8,899 | $751.2K |
30 days to 2026-11-02, from our own daily statistics per contract.
MLB & Baseball — development since capture
61,047,623 trades and $4.3B of USD turnover across 98 series since 2026-07-08; busiest single series-day 2026-07-29 with $59.3M, biggest contract KXMLBGAME-26OCT272000MILTB-MIL (2026-10-28, $8.7M).
| Month | Series active | Days | Trades | Turnover (USD) | Avg / day | Contracts traded | L2 updates | vs previous month |
|---|---|---|---|---|---|---|---|---|
| Nov 2026 (month to date) | 32 | 2 | 3,244 | $62.6K | $31.3K | 269 | 2.7M | — |
| Oct 2026 | 73 | 31 | 7,551,076 | $458.5M | $14.8M | 39,447 | 1.2B | −60.1 % |
| Sep 2026 | 92 | 30 | 17,537,292 | $1.2B | $38.3M | 231,763 | 5.0B | −26.7 % |
| Aug 2026 | 89 | 31 | 20,771,336 | $1.6B | $50.6M | 157,099 | 3.3B | +35.2 % |
| Jul 2026 | 45 | 24 | 15,184,675 | $1.2B | $48.3M | — | — | — |
MLB & Baseball series — 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.
MLB & Baseball — turnover by weekday
Wednesdays are the busiest day at about $21.4M of USD turnover, averaged over the captured days of the last 30.
| Weekday (UTC) | Avg turnover / day | USD | Avg trades | Days |
|---|---|---|---|---|
| Monday | $11.7M | 190.4K | 5 | |
| Tuesday | $15.0M | 250.0K | 4 | |
| Wednesday | $21.4M | 352.2K | 4 | |
| Thursday | $20.1M | 298.5K | 4 | |
| Friday | $8.8M | 151.7K | 4 | |
| Saturday | $5.4M | 109.2K | 4 | |
| Sunday | $12.6M | 211.4K | 5 |
MLB & Baseball series — 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 —.
Rising MLB & Baseball series — 30 days vs the 30 before
| # | Series | Venue | Turnover (30d) | Prior 30d | Growth (avg / day) | Trades (30d) |
|---|---|---|---|---|---|---|
| 1 | MLB National League Championship | Kalshi | $1.4M | $398.0K | +695.8 % | 23,792 |
| 2 | Teams in MLB Finals | Kalshi | $313.0K | $85.5K | +545.7 % | 20,173 |
| 3 | MLB American League Championship | Kalshi | $1.4M | $501.0K | +392.3 % | 22,536 |
| 4 | World Series | Kalshi | $9.5M | $2.8M | +234.3 % | 278,834 |
| 5 | Pro Baseball National League Manager of the Year | Kalshi | $56.0K | $30.6K | +82.9 % | 2,687 |
Growth of average USD turnover per captured day, the 30 days to 2026-11-02 against the 30 days before; series need ≥ 10 captured days in both windows and ≥ $10K of turnover in the current one. From our own daily statistics.
MLB & Baseball prediction markets — trades and turnover per day
Every captured UTC day of the last 30, summed over the 115 MLB & Baseball series — how much these markets trade day by day, from our own tick capture.
| UTC day | Series with stats | Contracts traded | Trades | Turnover | Buy share | L2 updates |
|---|---|---|---|---|---|---|
| 2026-11-02 | 31 | 158 | 1,822 | $43.7K | 44 % | 1.4M |
| 2026-11-01 | 32 | 111 | 1,422 | $19.0K | 71 % | 1.4M |
| 2026-10-31 | 28 | 107 | 1,519 | $21.4K | 54 % | 1.4M |
| 2026-10-30 | 32 | 127 | 22,013 | $368.4K | 77 % | 3.3M |
| 2026-10-29 | 63 | 639 | 204,719 | $12.1M | 62 % | 19.6M |
| 2026-10-28 | 68 | 1,067 | 396,177 | $24.5M | 69 % | 27.9M |
| 2026-10-27 | 68 | 1,113 | 217,978 | $13.0M | 73 % | 30.8M |
| 2026-10-26 | 68 | 589 | 66,664 | $3.9M | 81 % | 8.2M |
| 2026-10-25 | 68 | 798 | 239,581 | $13.7M | 59 % | 29.1M |
| 2026-10-24 | 68 | 1,037 | 263,815 | $13.5M | 64 % | 26.9M |
| 2026-10-23 | 68 | 586 | 77,199 | $4.8M | 85 % | 5.5M |
| 2026-10-22 | 66 | 310 | 12,595 | $3.3M | 96 % | 3.1M |
| 2026-10-21 | 62 | 291 | 14,946 | $443.4K | 71 % | 2.9M |
| 2026-10-20 | 66 | 750 | 138,640 | $7.6M | 62 % | 28.2M |
| 2026-10-19 | 66 | 560 | 50,115 | $3.1M | 83 % | 4.9M |
| 2026-10-18 | 66 | 994 | 254,086 | $16.7M | 63 % | 50.1M |
| 2026-10-17 | 70 | 601 | 87,946 | $4.2M | 64 % | 14.0M |
| 2026-10-16 | 71 | 1,094 | 319,380 | $18.9M | 60 % | 37.6M |
| 2026-10-15 | 71 | 2,243 | 508,603 | $32.8M | 65 % | 66.1M |
| 2026-10-14 | 72 | 1,602 | 275,491 | $14.9M | 69 % | 44.4M |
| 2026-10-13 | 73 | 1,806 | 233,798 | $16.0M | 63 % | 38.6M |
| 2026-10-12 | 72 | 1,986 | 464,047 | $29.3M | 68 % | 74.8M |
| 2026-10-11 | 73 | 1,507 | 171,274 | $9.3M | 72 % | 33.0M |
| 2026-10-10 | 73 | 994 | 83,594 | $3.9M | 80 % | 19.4M |
| 2026-10-09 | 73 | 1,123 | 188,181 | $11.2M | 58 % | 39.9M |
| 2026-10-08 | 70 | 2,320 | 468,020 | $32.3M | 67 % | 60.9M |
| 2026-10-07 | 70 | 3,516 | 722,030 | $45.9M | 67 % | 111.6M |
| 2026-10-06 | 70 | 2,313 | 409,667 | $23.5M | 67 % | 68.9M |
| 2026-10-05 | 69 | 1,788 | 369,408 | $22.0M | 62 % | 71.8M |
| 2026-10-04 | 69 | 2,007 | 390,829 | $23.4M | 69 % | 82.4M |
Per UTC day, summed over every MLB & Baseball series that has statistics for that day, from every trade print of every contract in our tick archive. Trades and USD turnover are exact; contracts traded, buy share and L2 (order-book) updates exist for days captured with the extended statistics — earlier days show —.
Most traded MLB & Baseball contracts on 2026-11-02
The single event contracts with the most USD turnover on the newest captured day — with open and close price and the outcome implied by the last print.
| Contract | Series | Venue | Open → Close | Implied outcome | Trades | Turnover | |
|---|---|---|---|---|---|---|---|
| KXMLBNLMVP-26-PCRO | Pro Baseball National League MVP | Kalshi | 0.990 → 0.990 | Yes | 10 | $17.8K | buy file → |
| KXMLBNLCY-26-JMIS | Pro Baseball National League Cy Young | Kalshi | 0.980 → 0.980 | Yes | 6 | $2.6K | buy file → |
| KXKBOGAME-26NOV030430SAMKTW-KTW | KBO Game | Kalshi | 0.100 → 0.670 | open | 97 | $2.4K | buy file → |
| KXMLBNLROTY-26-SSTE | Pro Baseball National League Rookie of the Year | Kalshi | 0.870 → 0.900 | open | 130 | $2.0K | buy file → |
| KXMLBGG-26ALP-TBIBEE28 | Pro Baseball Gold Glove | Kalshi | 0.850 → 0.990 | Yes | 65 | $1.7K | buy file → |
| KXMLBGG-26AL2B-CYOUNG2 | Pro Baseball Gold Glove | Kalshi | 0.890 → 0.990 | Yes | 44 | $1.6K | buy file → |
| KXMLBNLMOTY-26-PMUR | Pro Baseball National League Manager of the Year | Kalshi | 0.960 → 0.960 | open | 77 | $1.5K | buy file → |
| KXMLBNLROTY-26-CBEN | Pro Baseball National League Rookie of the Year | Kalshi | 0.120 → 0.130 | open | 142 | $1.1K | buy file → |
| KXMLBNEXTTEAM-27TSKUBAL-LAD | Pro Baseball Next Team | Kalshi | 0.120 → 0.370 | open | 48 | $780.42 | buy file → |
| KXMLBGG-26NLLF-JCHOURIO11 | Pro Baseball Gold Glove | Kalshi | 0.220 → 0.980 | Yes | 16 | $654.84 | buy file → |
Single contracts ranked by USD turnover on 2026-11-02 (UTC), from every trade print in our tick archive. Prices quote 0..1; the implied outcome reads the last print of the day (≥ 0.97 Yes/Up, ≤ 0.03 No/Down) — venues publish the official result. Each contract’s day file is sold individually, the whole series day as a bundle.
Kalshi MLB & Baseball series
Largest archive first. Each series page lists its exact coverage, day count and recent days; day bundles are bought in the shop calendar.
Polymarket MLB & Baseball series
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 | 414 | May 2025 – present | 127 GB | €1 | Buy days |
| KBO Baseball (games & props) | Polymarket | event | 250 | October 2025 – present | 7.53 GB | €1 | Buy days |
| NPB Baseball (games & props) | Polymarket | event | 127 | June 2026 – present | 4.86 GB | €1 | Buy days |
| MLB 2026 Regular Season Win Totals | Polymarket | annual | 210 | March 2026 – September 2026 | 592 MB | €1 | Buy days |
predict.fun MLB & Baseball series
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) | predict.fun | event | 21 | October 2026 – present | 33.4 MB | €1 | Buy days |
| KBO Baseball (games & props) | predict.fun | event | 25 | October 2026 – present | 14.0 MB | €1 | Buy days |
OG.com MLB & Baseball series
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) | OG.com | event | 24 | October 2026 – present | 537 MB | €1 | Buy days |
MLB & Baseball — market types across 115 series
1,144,057 contracts listed as of 2026-11-03, read from each contract's venue identifier — Kalshi lists each type as its own series, Polymarket, predict.fun and OG.com one family per league.
| Market type | Contracts listed (all time) | Listed last 30 days | Share |
|---|---|---|---|
| player & team props | 690,017 | 13,139 | 60 % |
| total / over-under | 123,120 | 2,971 | 11 % |
| spread / handicap | 55,001 | 1,442 | 5 % |
| moneyline / winner | 47,754 | 2,158 | 4 % |
| period markets | 21,321 | 715 | 2 % |
| draw | 4,858 | 301 | 0 % |
| strike ladder | 212 | 0 | 0 % |
| other | 201,774 | 10,580 | 18 % |
| Total | 1,144,057 | 31,306 | 100 % |
MLB & Baseball series— market type read from each contract's venue identifier (ticker suffix on Kalshi, slug suffix on Polymarket, market description on predict.fun and OG.com), counted over every contract listed in the family as of 2026-11-03; “listed last 30 days” counts contracts whose venue settlement time falls in that window. Every one of them is in the day bundle of its day.
Why buy MLB & Baseball prediction-market 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
MLB & Baseball prediction-market data — FAQ
Does Kalshi have MLB markets?
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.
Are Korean and Japanese baseball markets included?
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.
How far back does the MLB & Baseball data go?
Coverage runs May 2025 – present — 18,419 series-days across 115 series on Kalshi & OG.com & Polymarket & predict.fun. Each series page lists its exact span.
Can I get MLB & Baseball prediction-market 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, OG.com, Polymarket and predict.fun 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.
How much does MLB & Baseball prediction-market data cost?
€1 per series-day bundle — every contract of the series for that UTC day — no subscription, no minimum order. Pick days in the shop calendar, pay as a guest, download immediately.
Do I need an account or a sales call?
No. Pick the MLB & Baseball 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 MLB & Baseball 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.
Which market types are in the MLB & Baseball data?
As of 2026-11-03 the 115 MLB & Baseball series with a market-type snapshot had listed 1,144,057 contracts: player & team props 690,017 · total / over-under 123,120 · spread / handicap 55,001 · moneyline / winner 47,754 · period markets 21,321 · draw 4,858 — counted from every contract file of each family across Kalshi, OG.com, Polymarket, predict.fun. Kalshi splits these into separate series; Polymarket, predict.fun and OG.com list one family per league. Each series page shows its own mix.
What was the busiest MLB & Baseball trading day?
2026-07-29 — $59.3M of USD turnover over 576,079 trades in a single series-day. Since our statistics began on 2026-07-08, 98 MLB & Baseball series recorded 61,047,623 trades and $4.3B in total; the biggest single contract was KXMLBGAME-26OCT272000MILTB-MIL on 2026-10-28 at $8.7M. Wednesdays are the busiest weekday at about $21.4M per day.