World Series & MLB Playoffs Prediction Market
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. 2,034 series-days covering March 2026 – present; 361.6K trades · $12.9M 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.
World Series & MLB Playoffs on Kalshi
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.
Most traded World Series & MLB Playoffs 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 | World Series | Kalshi | 289,473 | $9.7M | 30 | Buy days |
| 2 | MLB American League Championship | Kalshi | 23,685 | $1.4M | 18 | Buy days |
| 3 | MLB National League Championship | Kalshi | 24,594 | $1.4M | 14 | Buy days |
| 4 | Teams in MLB Finals | Kalshi | 21,581 | $319.6K | 18 | Buy days |
| 5 | Pro Baseball Playoff Matchups | Kalshi | 2,306 | $25.5K | 11 | Buy days |
Trades and USD turnover summed over every contract of the series, from the recorded tick data; 30 days to 2026-11-01. Series without statistics in the window are omitted.
World Series & MLB Playoffs — development since capture
702,460 trades and $20.1M of USD turnover across 10 series since 2026-07-08; busiest single series-day 2026-10-28 with $1.2M, biggest contract KXMLB-26-MIL (2026-10-28, $1.0M).
| Month | Series active | Days | Trades | Turnover (USD) | Avg / day | Contracts traded | L2 updates | vs previous month |
|---|---|---|---|---|---|---|---|---|
| Nov 2026 (month to date) | 1 | 1 | 497 | $4.0K | $4.0K | 24 | 51.3K | — |
| Oct 2026 | 5 | 31 | 389,963 | $13.5M | $434.1K | 599 | 34.1M | +175.5 % |
| Sep 2026 | 10 | 30 | 199,262 | $4.9M | $162.8K | 2,969 | 71.0M | +187.5 % |
| Aug 2026 | 10 | 31 | 111,124 | $1.7M | $54.8K | 2,615 | 68.7M | +17056.3 % |
| Jul 2026 | 1 | 24 | 1,614 | $9.9K | $412.65 | — | — | — |
World Series & MLB Playoffs 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.
World Series & MLB Playoffs — turnover by weekday
Tuesdays are the busiest day at about $633.3K of USD turnover, averaged over the captured days of the last 30.
| Weekday (UTC) | Avg turnover / day | USD | Avg trades | Days |
|---|---|---|---|---|
| Monday | $358.6K | 11.8K | 4 | |
| Tuesday | $633.3K | 16.2K | 4 | |
| Wednesday | $528.2K | 12.2K | 4 | |
| Thursday | $603.3K | 15.7K | 4 | |
| Friday | $400.7K | 10.8K | 4 | |
| Saturday | $230.5K | 7.6K | 5 | |
| Sunday | $328.8K | 11.3K | 5 |
World Series & MLB Playoffs 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 World Series & MLB Playoffs 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 | $384.1K | +678.0 % | 24,594 |
| 2 | Teams in MLB Finals | Kalshi | $319.6K | $79.1K | +573.5 % | 21,581 |
| 3 | MLB American League Championship | Kalshi | $1.4M | $458.6K | +425.0 % | 23,685 |
| 4 | World Series | Kalshi | $9.7M | $2.7M | +262.0 % | 289,473 |
| 5 | Pro Baseball Playoff Matchups | Kalshi | $25.5K | $111.2K | −37.5 % | 2,306 |
Growth of average USD turnover per captured day, the 30 days to 2026-11-01 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.
World Series & MLB Playoffs prediction markets — trades and turnover per day
Every captured UTC day of the last 30, summed over the 10 World Series & MLB Playoffs 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 |
|---|---|---|---|---|---|---|
| 2026-11-01 | 1 | 24 | 497 | $4.0K | 85 % | 51.3K |
| 2026-10-31 | 1 | 26 | 632 | $3.2K | 77 % | 41.5K |
| 2026-10-30 | 1 | 23 | 784 | $4.6K | 84 % | 154.8K |
| 2026-10-29 | 1 | 22 | 6,649 | $687.8K | 52 % | 154.8K |
| 2026-10-28 | 1 | 2 | 15,192 | $1.2M | 43 % | 194.2K |
| 2026-10-27 | 1 | 2 | 12,475 | $706.4K | 52 % | 401.2K |
| 2026-10-26 | 1 | 2 | 4,469 | $283.9K | 42 % | 113.4K |
| 2026-10-25 | 1 | 2 | 12,499 | $475.7K | 51 % | 616.0K |
| 2026-10-24 | 1 | 2 | 12,409 | $510.6K | 57 % | 468.2K |
| 2026-10-23 | 1 | 2 | 6,487 | $460.9K | 80 % | 124.0K |
| 2026-10-22 | 1 | 2 | 3,757 | $166.8K | 70 % | 94.2K |
| 2026-10-21 | 1 | 2 | 6,726 | $257.4K | 64 % | 168.2K |
| 2026-10-20 | 3 | 7 | 15,719 | $835.3K | 71 % | 1.2M |
| 2026-10-19 | 3 | 7 | 8,741 | $276.5K | 48 % | 308.8K |
| 2026-10-18 | 3 | 7 | 13,486 | $409.5K | 64 % | 1.2M |
| 2026-10-17 | 3 | 7 | 5,948 | $194.4K | 50 % | 262.8K |
| 2026-10-16 | 4 | 12 | 24,132 | $837.4K | 76 % | 740.0K |
| 2026-10-15 | 4 | 12 | 27,433 | $908.6K | 73 % | 1.5M |
| 2026-10-14 | 4 | 12 | 10,113 | $416.7K | 83 % | 993.6K |
| 2026-10-13 | 5 | 14 | 18,600 | $682.0K | 66 % | 1.2M |
| 2026-10-12 | 5 | 14 | 19,320 | $646.4K | 71 % | 2.2M |
| 2026-10-11 | 5 | 18 | 13,747 | $438.1K | 71 % | 911.4K |
| 2026-10-10 | 5 | 18 | 4,269 | $160.5K | 60 % | 202.4K |
| 2026-10-09 | 5 | 18 | 11,767 | $299.9K | 64 % | 878.4K |
| 2026-10-08 | 5 | 39 | 25,000 | $650.1K | 76 % | 3.7M |
| 2026-10-07 | 5 | 40 | 16,958 | $259.5K | 80 % | 3.5M |
| 2026-10-06 | 5 | 41 | 17,986 | $309.7K | 76 % | 2.9M |
| 2026-10-05 | 5 | 40 | 14,755 | $227.7K | 71 % | 2.3M |
| 2026-10-04 | 5 | 40 | 16,459 | $316.5K | 60 % | 2.1M |
| 2026-10-03 | 5 | 40 | 14,630 | $283.8K | 78 % | 1.3M |
Per UTC day, summed over every World Series & MLB Playoffs 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 World Series & MLB Playoffs contracts on 2026-11-01
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 | |
|---|---|---|---|---|---|---|---|
| KXMLB-27-LAD | World Series | Kalshi | 0.206 → 0.202 | open | 175 | $2.2K | buy file → |
| KXMLB-27-MIL | World Series | Kalshi | 0.121 → 0.165 | open | 268 | $1.2K | buy file → |
| KXMLB-27-CIN | World Series | Kalshi | 0.018 → 0.019 | No | 9 | $374.3 | buy file → |
| KXMLB-27-SF | World Series | Kalshi | 0.020 → 0.020 | No | 5 | $197.44 | buy file → |
| KXMLB-27-SD | World Series | Kalshi | 0.068 → 0.068 | open | 5 | $28.16 | buy file → |
| KXMLB-27-ATL | World Series | Kalshi | 0.070 → 0.070 | open | 3 | $23.49 | buy file → |
| KXMLB-27-CHC | World Series | Kalshi | 0.040 → 0.064 | open | 4 | $12.33 | buy file → |
| KXMLB-27-NYM | World Series | Kalshi | 0.073 → 0.073 | open | 2 | $10.32 | buy file → |
| KXMLB-27-TEX | World Series | Kalshi | 0.038 → 0.038 | open | 1 | $9.37 | buy file → |
| KXMLB-27-BAL | World Series | Kalshi | 0.020 → 0.030 | No | 3 | $9.36 | buy file → |
Single contracts ranked by USD turnover on 2026-11-01 (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 World Series & MLB Playoffs 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 | |
|---|---|---|---|---|---|---|---|
| World Series | Kalshi | event | 243 | March 2026 – present | 3.69 GB | €1 | Buy days |
| Teams in MLB Finals | Kalshi | event | 231 | March 2026 – present | 1.81 GB | €1 | Buy days |
| Pro Baseball Playoff Qualifiers | Kalshi | annual | 209 | March 2026 – September 2026 | 1.42 GB | €1 | Buy days |
| MLB American League Championship | Kalshi | annual | 231 | March 2026 – present | 1018 MB | €1 | Buy days |
| MLB National League Championship | Kalshi | annual | 227 | March 2026 – October 2026 | 728 MB | €1 | Buy days |
| Pro Baseball Playoff Matchups | Kalshi | event | 57 | August 2026 – October 2026 | 563 MB | €1 | Buy days |
| Pro Baseball Best Record (KXMLBBESTRECORD) | Kalshi | annual | 209 | March 2026 – September 2026 | 332 MB | €1 | Buy days |
| Pro Baseball Best Record (KXMLBWORSTRECORD) | Kalshi | annual | 209 | March 2026 – September 2026 | 304 MB | €1 | Buy days |
| Longest Winning Streak | Kalshi | event | 209 | March 2026 – September 2026 | 244 MB | €1 | Buy days |
| Longest Losing Streak | Kalshi | event | 209 | March 2026 – September 2026 | 105 MB | €1 | Buy days |
Why buy World Series & MLB Playoffs 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
World Series & MLB Playoffs prediction-market data — FAQ
Does Kalshi have a World Series market?
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.
How is World Series prediction-market data sold?
One purchase covers every contract of the series for one UTC day — every trade print and the complete Level-2 book per contract, captured co-located with nanosecond timestamps — €1 per series-day, bought as a guest with instant download.
How far back does the World Series & MLB Playoffs data go?
Coverage runs March 2026 – present — 2,034 series-days across 10 series on Kalshi. Each series page lists its exact span.
Can I get World Series & MLB Playoffs 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 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 World Series & MLB Playoffs 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 World Series & MLB Playoffs 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 World Series & MLB Playoffs 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.
What was the busiest World Series & MLB Playoffs trading day?
2026-10-28 — $1.2M of USD turnover over 15,192 trades in a single series-day. Since our statistics began on 2026-07-08, 10 World Series & MLB Playoffs series recorded 702,460 trades and $20.1M in total; the biggest single contract was KXMLB-26-MIL on 2026-10-28 at $1.0M. Tuesdays are the busiest weekday at about $633.3K per day.