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. 1,993 series-days covering March 2026 – present; 333.0K trades · $8.1M 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 | 224,992 | $4.5M | 30 | Buy days |
| 2 | Pro Baseball Playoff Qualifiers | Kalshi | 13,191 | $1.1M | 16 | Buy days |
| 3 | MLB American League Championship | Kalshi | 27,159 | $1.0M | 30 | Buy days |
| 4 | MLB National League Championship | Kalshi | 27,437 | $942.4K | 30 | Buy days |
| 5 | Teams in MLB Finals | Kalshi | 28,647 | $220.1K | 30 | Buy days |
| 6 | Pro Baseball Playoff Matchups | Kalshi | 5,445 | $134.5K | 30 | Buy days |
| 7 | Pro Baseball Best Record (KXMLBBESTRECORD) | Kalshi | 4,764 | $75.3K | 16 | Buy days |
| 8 | Pro Baseball Best Record (KXMLBWORSTRECORD) | Kalshi | 1,158 | $16.9K | 16 | Buy days |
| 9 | Longest Winning Streak | Kalshi | 90 | $3.3K | 16 | Buy days |
| 10 | Longest Losing Streak | Kalshi | 101 | $1.3K | 16 | Buy days |
Trades and USD turnover summed over every contract of the series, from the recorded tick data; 30 days to 2026-10-12. Series without statistics in the window are omitted.
World Series & MLB Playoffs — development since capture
495,712 trades and $10.8M of USD turnover across 10 series since 2026-07-08; busiest single series-day 2026-09-29 with $780.8K, biggest contract KXMLB-26-HOU (2026-09-29, $490.8K).
| Month | Series active | Days | Trades | Turnover (USD) | Avg / day | Contracts traded | L2 updates | vs previous month |
|---|---|---|---|---|---|---|---|---|
| Oct 2026 (month to date) | 5 | 12 | 183,712 | $4.2M | $346.8K | 434 | 24.1M | — |
| 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 $370.0K of USD turnover, averaged over the captured days of the last 30.
| Weekday (UTC) | Avg turnover / day | USD | Avg trades | Days |
|---|---|---|---|---|
| Monday | $275.1K | 11.3K | 5 | |
| Tuesday | $370.0K | 11.9K | 4 | |
| Wednesday | $271.1K | 13.4K | 4 | |
| Thursday | $314.8K | 13.1K | 4 | |
| Friday | $222.2K | 9.2K | 4 | |
| Saturday | $184.8K | 8.3K | 4 | |
| Sunday | $258.8K | 10.5K | 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 | Pro Baseball Playoff Matchups | Kalshi | $134.5K | $1.0K | +11410.6 % | 5,445 |
| 2 | Teams in MLB Finals | Kalshi | $220.1K | $15.4K | +1325.3 % | 28,647 |
| 3 | MLB National League Championship | Kalshi | $942.4K | $126.4K | +645.5 % | 27,437 |
| 4 | MLB American League Championship | Kalshi | $1.0M | $167.7K | +525.1 % | 27,159 |
| 5 | World Series | Kalshi | $4.5M | $944.4K | +380.4 % | 224,992 |
Growth of average USD turnover per captured day, the 30 days to 2026-10-12 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 |
|---|---|---|---|---|---|---|
| 2026-10-12 | 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 |
| 2026-10-02 | 5 | 52 | 12,761 | $243.3K | 79 % | 1.5M |
| 2026-10-01 | 5 | 74 | 16,060 | $326.3K | 75 % | 2.8M |
| 2026-09-30 | 5 | 89 | 23,046 | $429.7K | 72 % | 3.3M |
| 2026-09-29 | 5 | 87 | 18,415 | $940.7K | 90 % | 2.0M |
| 2026-09-28 | 10 | 91 | 10,935 | $258.1K | 79 % | 719.4K |
| 2026-09-27 | 10 | 94 | 9,653 | $259.6K | 68 % | 1.3M |
| 2026-09-26 | 10 | 82 | 7,101 | $160.3K | 59 % | 1.1M |
| 2026-09-25 | 10 | 80 | 8,181 | $219.3K | 72 % | 1.2M |
| 2026-09-24 | 10 | 97 | 6,841 | $183.7K | 54 % | 1.7M |
| 2026-09-23 | 10 | 94 | 7,306 | $227.3K | 62 % | 1.6M |
| 2026-09-22 | 10 | 98 | 5,869 | $105.1K | 74 % | 1.2M |
| 2026-09-21 | 10 | 97 | 6,326 | $144.6K | 50 % | 850.6K |
| 2026-09-20 | 10 | 98 | 6,851 | $173.2K | 60 % | 1.1M |
| 2026-09-19 | 10 | 106 | 7,172 | $134.6K | 55 % | 1.2M |
| 2026-09-18 | 10 | 91 | 4,265 | $126.5K | 68 % | 713.9K |
| 2026-09-17 | 10 | 100 | 4,689 | $99.2K | 69 % | 832.7K |
| 2026-09-16 | 10 | 103 | 6,241 | $167.8K | 54 % | 2.2M |
| 2026-09-15 | 10 | 100 | 5,139 | $124.4K | 62 % | 1.9M |
| 2026-09-14 | 10 | 101 | 5,398 | $98.7K | 72 % | 1.8M |
| 2026-09-13 | 10 | 96 | 5,844 | $106.4K | 68 % | 3.6M |
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 2026-10-12
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-26-LAD | World Series | Kalshi | 0.444 → 0.271 | open | 4,952 | $141.9K | buy file → |
| KXMLB-26-MIL | World Series | Kalshi | 0.258 → 0.407 | open | 5,436 | $123.1K | buy file → |
| KXMLBNL-26-LAD | MLB National League Championship | Kalshi | 0.600 → 0.340 | open | 1,689 | $107.9K | buy file → |
| KXMLBNL-26-MIL | MLB National League Championship | Kalshi | 0.410 → 0.640 | open | 1,709 | $86.7K | buy file → |
| KXMLBAL-26-TB | MLB American League Championship | Kalshi | 0.620 → 0.630 | open | 490 | $75.8K | buy file → |
| KXMLB-26-TB | World Series | Kalshi | 0.214 → 0.255 | open | 1,613 | $29.5K | buy file → |
| KXMLB-26-CLE | World Series | Kalshi | 0.103 → 0.103 | open | 1,988 | $25.6K | buy file → |
| KXMLBAL-26-CLE | MLB American League Championship | Kalshi | 0.380 → 0.380 | open | 215 | $24.8K | buy file → |
| KXTEAMSINWS-26-TBLAD | Teams in MLB Finals | Kalshi | 0.389 → 0.230 | open | 474 | $14.9K | buy file → |
| KXTEAMSINWS-26-TBMIL | Teams in MLB Finals | Kalshi | 0.253 → 0.420 | open | 445 | $10.9K | buy file → |
Single contracts ranked by USD turnover on 2026-10-12 (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.
Biggest World Series & MLB Playoffs moves in the last 24 hours
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 |
|---|---|---|---|---|
| KXMLBAL-26-CLE | Kalshi | 0.38 → 0.57 | +0.19 | $38.5K |
| KXMLBNL-26-MIL | Kalshi | 0.53 → 0.68 | +0.15 | $92.6K |
| KXMLB-26-MIL | Kalshi | 0.33 → 0.45 | +0.12 | $175.7K |
| KXMLB-26-CLE | Kalshi | 0.11 → 0.17 | +0.07 | $66.3K |
| KXMLBAL-26-TB | Kalshi | 0.63 → 0.43 | -0.20 | $101.2K |
| KXMLBNL-26-LAD | Kalshi | 0.47 → 0.30 | -0.17 | $68.3K |
| KXMLB-26-LAD | Kalshi | 0.34 → 0.21 | -0.13 | $142.5K |
| KXMLB-26-TB | Kalshi | 0.23 → 0.17 | -0.06 | $45.3K |
| KXTEAMSINWS-26-TBMIL | Kalshi | 0.35 → 0.30 | -0.05 | $11.6K |
Live contracts ranked by absolute 24-hour price change (contracts quote 0..1; settled or near-settled contracts excluded). Snapshot 2026-10-13 17:32 UTC. Full list in the prediction movers.
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 | 223 | March 2026 – present | 3.54 GB | €1 | Buy days |
| Teams in MLB Finals | Kalshi | event | 223 | March 2026 – present | 1.72 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 | 223 | March 2026 – present | 1000 MB | €1 | Buy days |
| MLB National League Championship | Kalshi | annual | 223 | March 2026 – present | 719 MB | €1 | Buy days |
| Pro Baseball Playoff Matchups | Kalshi | event | 56 | August 2026 – present | 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 — 1,993 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?
2026-09-29 — $780.8K of USD turnover over 11,686 trades in a single series-day. Since our statistics began on 2026-07-08, 10 World Series & MLB Playoffs series recorded 495,712 trades and $10.8M in total; the biggest single contract was KXMLB-26-HOU on 2026-09-29 at $490.8K. Tuesdays are the busiest weekday at about $370.0K per day.