Kalshi KXMLB — World Series Historical Data
Every Kalshi “World Series” contract of the day — every trade print and the complete Level-2 book, captured co-located with nanosecond venue and receive timestamps. 243 trading days as day bundles, €1 per day, bought as a guest with instant download.
World Series on Kalshi — activity
Trades and USD turnover summed over every contract of the series across 30 captured days to 2026-11-01, from the recorded tick data — the per-day averages divide by the captured days. Buy share, quoted spread (in contract price cents, 0..1 = 100 ¢), best-bid/ask depth and Level-2 update counts are turnover-weighted over the same window.
One purchase, the whole series for a day
A series-day bundle contains every World Series contract that was listed on Kalshi on that UTC day — traded or not — 30 contract files on the latest covered day. Each file carries the full raw feed: every trade print with price, size and side, plus Level-2 order-book updates, in the same zstd-compressed schema as our crypto venues. Event contracts quote 0..1; turnover is USD-normalized.
Coverage runs March 2026 – present — 243 trading days, 3.69 GB compressed in total. A day typically holds 26 contract files (up to 32 on the busiest day, 227 MB). Pick individual days in the shop calendar for €1 each; delivery is an instant per-file download or one archive for the whole day.
World Series — development since capture
497,901 trades and $13.3M of USD turnover over 85 captured days since 2026-08-09 — record day 2026-10-28 with $1.2M, biggest single contract KXMLB-26-MIL (MLB · MIL) (2026-10-28, $1.0M).
| Month | Days | Trades | Turnover (USD) | Avg / day | Contracts traded | L2 updates | vs previous month |
|---|---|---|---|---|---|---|---|
| Nov 2026 (month to date) | 1 | 497 | $4.0K | $4.0K | 24 | 51.3K | — |
| Oct 2026 | 31 | 309,558 | $10.1M | $325.5K | 203 | 10.4M | +328.0 % |
| Sep 2026 | 30 | 118,517 | $2.4M | $78.6K | 650 | 14.1M | +173.7 % |
| Aug 2026 | 23 | 69,329 | $861.3K | $37.4K | 636 | 11.6M | — |
Kalshi World 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 markets on other prediction venues
Polymarket, predict.fun, OG.com also list MLB event markets — the same 30-day statistics side by side, each a day bundle of its own.
| Venue · series | Trades (30d) | Turnover (30d) | Avg spread | Top-1 depth | L2 updates / trade | Days archived | Price / day |
|---|---|---|---|---|---|---|---|
| Kalshi · World Series (this page) | 289,473 | $9.7M | 0.47 ¢ | $22.6K | 32.3 | 243 | €1 |
| Polymarket · MLB (games & props) | 94,434 | $22.7M | 2.15 ¢ | $60.6K | 745.0 | 414 | €1 |
| predict.fun · MLB (games & props) | 7,740 | $699.9K | 1.44 ¢ | $33.3K | 223.1 | 21 | €1 |
| OG.com · MLB (games & props) | 146,368 | $8.6M | 2.09 ¢ | $57.9K | 282.3 | 24 | €1 |
30-day window of the statistics table, per venue's own series; spread in contract-price cents and best-bid/ask depth are turnover-weighted, L2 updates per trade = recorded order-book level updates ÷ trades. "—" = no statistics row in the window. Each venue settles its own contracts on its own rules — the series are comparable in subject, not interchangeable.
World Series — activity by weekday
Tuesdays carry the most turnover, about $504.8K per day.
| Weekday (UTC) | Avg turnover / day | USD | Avg trades | Days |
|---|---|---|---|---|
| Monday | $239.2K | 9.3K | 4 | |
| Tuesday | $504.8K | 12.9K | 4 | |
| Wednesday | $458.0K | 10.4K | 4 | |
| Thursday | $412.4K | 11.9K | 4 | |
| Friday | $295.7K | 8.8K | 4 | |
| Saturday | $193.8K | 6.4K | 5 | |
| Sunday | $219.8K | 8.8K | 5 |
Kalshi World 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 —.
World Series — last 30 days in the archive
Files, size, contracts traded, trades, USD turnover, buy share, quoted spread, top-of-book depth and order-book updates per UTC day, from the recorded tick data.
| UTC day | Files | Size | Traded | Trades | Turnover | Buy share | Avg spread | Top-1 depth | L2 updates | Notes | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-11-01 | 30 | 1.48 MB | 24 | 497 | $4.0K | 85 % | 2.12 ¢ | $155.83 | 51.3K | Buy day → | |
| 2026-10-31 | 30 | 1.32 MB | 26 | 632 | $3.2K | 77 % | 1.93 ¢ | $215.79 | 41.5K | Buy day → | |
| 2026-10-30 | 30 | 4.13 MB | 23 | 784 | $4.6K | 84 % | 2.13 ¢ | $286.35 | 154.8K | Buy day → | |
| 2026-10-29 | 32 | 4.45 MB | 22 | 6,649 | $687.8K | 52 % | 0.36 ¢ | $287.5K | 154.8K | Buy day → | |
| 2026-10-28 | 2 | 5.94 MB | 2 | 15,192 | $1.2M | 43 % | 0.29 ¢ | $5.6K | 194.2K | Buy day → | |
| 2026-10-27 | 2 | 10.9 MB | 2 | 12,475 | $706.4K | 52 % | 0.38 ¢ | $2.3K | 401.2K | Buy day → | |
| 2026-10-26 | 2 | 3.23 MB | 2 | 4,469 | $283.9K | 42 % | 0.47 ¢ | $1.1K | 113.4K | Buy day → | |
| 2026-10-25 | 2 | 16.2 MB | 2 | 12,499 | $475.7K | 51 % | 0.68 ¢ | $630.61 | 616.0K | Buy day → | |
| 2026-10-24 | 2 | 12.5 MB | 2 | 12,409 | $510.6K | 57 % | 0.68 ¢ | $1.4K | 468.2K | Buy day → | |
| 2026-10-23 | 2 | 3.65 MB | 2 | 6,487 | $460.9K | 80 % | 0.71 ¢ | $3.2K | 124.0K | Buy day → | |
| 2026-10-22 | 2 | 2.71 MB | 2 | 3,757 | $166.8K | 70 % | 0.54 ¢ | $1.1K | 94.2K | Buy day → | |
| 2026-10-21 | 2 | 4.85 MB | 2 | 6,726 | $257.4K | 64 % | 0.77 ¢ | $1.2K | 168.2K | Buy day → | |
| 2026-10-20 | 3 | 10.2 MB | 3 | 12,985 | $715.2K | 74 % | 0.47 ¢ | $5.2K | 366.6K | Buy day → | |
| 2026-10-19 | 3 | 5.39 MB | 3 | 7,031 | $180.2K | 54 % | 0.60 ¢ | $819.48 | 181.4K | Buy day → | |
| 2026-10-18 | 3 | 8.73 MB | 3 | 9,601 | $208.3K | 56 % | 0.54 ¢ | $380.37 | 314.7K | Buy day → | |
| 2026-10-17 | 3 | 4.68 MB | 3 | 5,051 | $149.2K | 55 % | 0.43 ¢ | $2.3K | 166.8K | Buy day → | |
| 2026-10-16 | 4 | 12.1 MB | 4 | 18,989 | $539.8K | 76 % | 0.45 ¢ | $1.9K | 421.5K | Buy day → | |
| 2026-10-15 | 4 | 16.0 MB | 4 | 18,914 | $428.9K | 75 % | 0.63 ¢ | $781.31 | 582.8K | Buy day → | |
| 2026-10-14 | 4 | 7.38 MB | 4 | 7,157 | $213.8K | 84 % | 0.67 ¢ | $1.1K | 265.3K | Buy day → | |
| 2026-10-13 | 4 | 12.6 MB | 4 | 12,895 | $373.1K | 68 % | 0.51 ¢ | $3.9K | 456.5K | Buy day → | |
| 2026-10-12 | 4 | 18.1 MB | 4 | 13,989 | $320.1K | 69 % | 0.68 ¢ | $344.2 | 679.2K | Buy day → | |
| 2026-10-11 | 5 | 7.00 MB | 5 | 9,455 | $216.5K | 67 % | 0.41 ¢ | $1.7K | 244.3K | Buy day → | |
| 2026-10-10 | 5 | 2.06 MB | 5 | 3,170 | $101.0K | 54 % | 0.21 ¢ | $3.1K | 66.6K | Buy day → | |
| 2026-10-09 | 5 | 5.68 MB | 5 | 8,828 | $177.5K | 61 % | 0.38 ¢ | $1.0K | 193.0K | Buy day → | |
| 2026-10-08 | 8 | 14.9 MB | 8 | 18,405 | $366.1K | 74 % | 0.30 ¢ | $1.6K | 534.5K | Buy day → | |
| 2026-10-07 | 8 | 15.7 MB | 8 | 12,607 | $181.9K | 80 % | 0.31 ¢ | $256.59 | 586.8K | Buy day → | |
| 2026-10-06 | 8 | 10.8 MB | 8 | 13,354 | $224.6K | 77 % | 0.25 ¢ | $556.98 | 384.3K | Buy day → | |
| 2026-10-05 | 8 | 15.0 MB | 8 | 11,534 | $172.7K | 71 % | 0.38 ¢ | $451.45 | 567.8K | Buy day → | |
| 2026-10-04 | 8 | 11.4 MB | 8 | 11,968 | $194.5K | 66 % | 0.43 ¢ | $1.1K | 412.2K | Buy day → | |
| 2026-10-03 | 8 | 9.35 MB | 8 | 10,964 | $205.2K | 82 % | 0.38 ¢ | $4.0K | 338.1K | Buy day → |
Traded = contracts with at least one trade that day. Buy share = taker-buy side of USD turnover. Avg spread = quoted bid-ask spread in contract price cents (0..1 = 100 ¢), weighted by turnover across the day’s contracts. Top-1 depth = mean of the best bid and best ask notional in USD, weighted by turnover. L2 updates = order-book level updates recorded across all contracts of the day. Days captured before the extended statistics show —.
Most traded World Series contracts by day
The ten contracts with the most USD turnover per UTC day — open, high, low, close, VWAP and the outcome implied by the last print; the six previous days fold out below.
The 10 most traded World Series contracts on 2026-11-01 — 0 closed Yes (≥ 0.97), 3 closed No (≤ 0.03), 7 still open at the last print: 475 trades, $4.0K USD turnover. The busiest contract was KXMLB-27-LAD with $2.2K turnover.
| Contract | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXMLB-27-LAD MLB · LAD | 0.206 | 0.229 | 0.183 | 0.202 | 0.222 | open | 175 | $2.2K | 87 % | 2.25 ¢ | $198.31 | 8.9K | buy file → |
| KXMLB-27-MIL MLB · MIL | 0.121 | 0.165 | 0.118 | 0.165 | 0.143 | open | 268 | $1.2K | 73 % | 2.42 ¢ | $128.82 | 25.1K | buy file → |
| KXMLB-27-CIN MLB · CIN | 0.018 | 0.019 | 0.018 | 0.019 | 0.019 | No | 9 | $374.3 | 100 % | 0.84 ¢ | $40.81 | 171 | buy file → |
| KXMLB-27-SF MLB · SF | 0.020 | 0.020 | 0.017 | 0.020 | 0.019 | No | 5 | $197.44 | 100 % | 0.84 ¢ | $129.66 | 313 | buy file → |
| KXMLB-27-SD MLB · SD | 0.068 | 0.068 | 0.066 | 0.068 | 0.067 | open | 5 | $28.16 | 100 % | 3.65 ¢ | $7.78 | 292 | buy file → |
| KXMLB-27-ATL MLB · ATL | 0.070 | 0.070 | 0.070 | 0.070 | 0.070 | open | 3 | $23.49 | 100 % | 3.58 ¢ | $23.9 | 158 | buy file → |
| KXMLB-27-CHC MLB · CHC | 0.040 | 0.064 | 0.040 | 0.064 | 0.064 | open | 4 | $12.33 | 100 % | 3.37 ¢ | $70.61 | 1.6K | buy file → |
| KXMLB-27-NYM MLB · NYM | 0.073 | 0.073 | 0.073 | 0.073 | 0.073 | open | 2 | $10.32 | 100 % | 4.20 ¢ | $82.45 | 219 | buy file → |
| KXMLB-27-TEX MLB · TEX | 0.038 | 0.038 | 0.038 | 0.038 | 0.038 | open | 1 | $9.37 | 100 % | 1.90 ¢ | $50.21 | 164 | buy file → |
| KXMLB-27-BAL MLB · BAL | 0.020 | 0.030 | 0.020 | 0.030 | 0.030 | No | 3 | $9.36 | 100 % | 1.06 ¢ | $34.12 | 243 | buy file → |
Prices quote 0..1 (probability of Yes). Open/high/low/close/VWAP are that UTC day’s trade prints per contract; the implied outcome reads the last print — ≥ 0.97 as Yes, ≤ 0.03 as No, anything between as still open — venues publish the official result. Buy share = taker-buy side of turnover; spread = the contract's turnover-weighted quoted bid-ask spread in cents, top-1 depth = mean best-bid/ask notional per side, L2 updates = order-book level updates recorded for the contract that day. “Settles” is the venue-listed close time of the contract where the venue publishes one (UTC).
2026-10-31 — 10 contracts, 598 trades, $3.2K turnover
The 10 most traded World Series contracts on 2026-10-31 — 0 closed Yes (≥ 0.97), 3 closed No (≤ 0.03), 7 still open at the last print: 598 trades, $3.2K USD turnover. The busiest contract was KXMLB-27-MIL with $1.8K turnover.
| Contract | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXMLB-27-MIL MLB · MIL | 0.102 | 0.150 | 0.102 | 0.121 | 0.136 | open | 276 | $1.8K | 80 % | 1.73 ¢ | $277.06 | 6.4K | buy file → |
| KXMLB-27-LAD MLB · LAD | 0.191 | 0.229 | 0.186 | 0.206 | 0.212 | open | 276 | $1.1K | 67 % | 2.24 ¢ | $159.82 | 8.1K | buy file → |
| KXMLB-27-BOS MLB · BOS | 0.062 | 0.062 | 0.060 | 0.062 | 0.061 | open | 4 | $46.94 | 100 % | 2.95 ¢ | $24.74 | 184 | buy file → |
| KXMLB-27-STL MLB · STL | 0.019 | 0.019 | 0.019 | 0.019 | 0.019 | No | 4 | $38.73 | 100 % | 0.90 ¢ | $193.87 | 198 | buy file → |
| KXMLB-27-SD MLB · SD | 0.064 | 0.068 | 0.063 | 0.068 | 0.065 | open | 6 | $37.55 | 100 % | 3.26 ¢ | $7.29 | 409 | buy file → |
| KXMLB-27-SF MLB · SF | 0.018 | 0.020 | 0.018 | 0.020 | 0.019 | No | 10 | $37.43 | 100 % | 0.84 ¢ | $40.87 | 242 | buy file → |
| KXMLB-27-NYY MLB · NYY | 0.095 | 0.102 | 0.088 | 0.102 | 0.099 | open | 13 | $27.83 | 100 % | 3.71 ¢ | $8.03 | 8.8K | buy file → |
| KXMLB-27-LAA MLB · LAA | 0.018 | 0.018 | 0.018 | 0.018 | 0.018 | No | 1 | $22.93 | 100 % | 0.80 ¢ | $18.61 | 203 | buy file → |
| KXMLB-27-SEA MLB · SEA | 0.045 | 0.045 | 0.040 | 0.045 | 0.040 | open | 4 | $21.58 | 100 % | 1.43 ¢ | $43.82 | 204 | buy file → |
| KXMLB-27-CWS MLB · CWS | 0.048 | 0.049 | 0.048 | 0.049 | 0.049 | open | 4 | $18.76 | 100 % | 2.71 ¢ | $105.38 | 448 | buy file → |
2026-10-30 — 10 contracts, 757 trades, $4.5K turnover
The 10 most traded World Series contracts on 2026-10-30 — 0 closed Yes (≥ 0.97), 1 closed No (≤ 0.03), 9 still open at the last print: 757 trades, $4.5K USD turnover. The busiest contract was KXMLB-27-MIL with $3.3K turnover.
| Contract | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXMLB-27-MIL MLB · MIL | 0.120 | 0.148 | 0.101 | 0.102 | 0.121 | open | 427 | $3.3K | 85 % | 2.06 ¢ | $291.19 | 29.9K | buy file → |
| KXMLB-27-LAD MLB · LAD | 0.227 | 0.229 | 0.183 | 0.191 | 0.213 | open | 249 | $870.64 | 76 % | 1.78 ¢ | $379.49 | 13.7K | buy file → |
| KXMLB-27-SD MLB · SD | 0.068 | 0.068 | 0.064 | 0.064 | 0.068 | open | 6 | $93.87 | 100 % | 3.83 ¢ | $16.68 | 12.7K | buy file → |
| KXMLB-27-NYY MLB · NYY | 0.109 | 0.109 | 0.052 | 0.095 | 0.096 | open | 21 | $82.09 | 94 % | 4.44 ¢ | $179.23 | 27.6K | buy file → |
| KXMLB-27-DET MLB · DET | 0.073 | 0.073 | 0.067 | 0.069 | 0.069 | open | 13 | $67.72 | 100 % | 4.70 ¢ | $15.32 | 16.3K | buy file → |
| KXMLB-27-STL MLB · STL | 0.017 | 0.019 | 0.017 | 0.019 | 0.018 | No | 14 | $64.56 | 100 % | 0.95 ¢ | $156.07 | 568 | buy file → |
| KXMLB-27-TB MLB · TB | 0.064 | 0.065 | 0.050 | 0.050 | 0.064 | open | 10 | $48.33 | 100 % | 2.86 ¢ | $7.22 | 9.2K | buy file → |
| KXMLB-27-BOS MLB · BOS | 0.064 | 0.064 | 0.061 | 0.062 | 0.062 | open | 4 | $23.47 | 100 % | 2.97 ¢ | $28.21 | 6.3K | buy file → |
| KXMLB-27-CWS MLB · CWS | 0.048 | 0.049 | 0.046 | 0.048 | 0.048 | open | 8 | $18.75 | 100 % | 2.81 ¢ | $41.11 | 16.1K | buy file → |
| KXMLB-27-ATL MLB · ATL | 0.076 | 0.076 | 0.072 | 0.072 | 0.076 | open | 5 | $11.53 | 100 % | 3.25 ¢ | $7.64 | 8.2K | buy file → |
2026-10-29 — 10 contracts, 6,549 trades, $687.5K turnover
The 10 most traded World Series contracts on 2026-10-29 — 1 closed Yes (≥ 0.97), 2 closed No (≤ 0.03), 7 still open at the last print: 6,549 trades, $687.5K USD turnover. The busiest contract was KXMLB-26-MIL with $650.6K turnover.
| Contract | Settles (UTC) | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXMLB-26-MIL MLB · MIL | 2026-10-29 03:16 | 0.906 | 0.999 | 0.897 | 0.999 | 0.969 | Yes | 2,678 | $650.6K | 50 % | 0.30 ¢ | $303.9K | 45.3K | buy file → |
| KXMLB-26-TB MLB · TB | 2026-10-29 03:16 | 0.098 | 0.109 | 0.001 | 0.001 | 0.033 | No | 3,153 | $28.9K | 67 % | 0.41 ¢ | $357.67 | 56.5K | buy file → |
| KXMLB-27-MIL MLB · MIL | — | 0.950 | 0.999 | 0.031 | 0.120 | 0.128 | open | 511 | $4.9K | 89 % | 4.57 ¢ | $827.35 | 26.5K | buy file → |
| KXMLB-27-LAD MLB · LAD | — | 0.010 | 0.950 | 0.010 | 0.227 | 0.224 | open | 115 | $1.7K | 93 % | 7.06 ¢ | $766.81 | 4.6K | buy file → |
| KXMLB-27-CLE MLB · CLE | — | 0.020 | 0.058 | 0.020 | 0.058 | 0.053 | open | 21 | $401.42 | 100 % | 3.10 ¢ | $24.3 | 11.7K | buy file → |
| KXMLB-27-CWS MLB · CWS | — | 0.020 | 0.055 | 0.020 | 0.048 | 0.047 | open | 14 | $291.56 | 100 % | 4.59 ¢ | $157.27 | 653 | buy file → |
| KXMLB-27-TB MLB · TB | — | 0.020 | 0.076 | 0.020 | 0.064 | 0.069 | open | 18 | $264.72 | 100 % | 5.95 ¢ | $160.99 | 415 | buy file → |
| KXMLB-27-SD MLB · SD | — | 0.020 | 0.076 | 0.020 | 0.068 | 0.071 | open | 14 | $209.43 | 100 % | 5.91 ¢ | $162.85 | 464 | buy file → |
| KXMLB-27-ATL MLB · ATL | — | 0.020 | 0.090 | 0.020 | 0.076 | 0.079 | open | 20 | $170.3 | 100 % | 5.55 ¢ | $193.97 | 702 | buy file → |
| KXMLB-27-SF MLB · SF | — | 0.019 | 0.019 | 0.017 | 0.019 | 0.019 | No | 5 | $140.35 | 100 % | 1.64 ¢ | $26.2 | 153 | buy file → |
2026-10-28 — 2 contracts, 15,192 trades, $1.2M turnover
The 2 most traded World Series contracts on 2026-10-28 — 0 closed Yes (≥ 0.97), 0 closed No (≤ 0.03), 2 still open at the last print: 15,192 trades, $1.2M USD turnover. The busiest contract was KXMLB-26-MIL with $1.0M turnover.
| Contract | Settles (UTC) | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXMLB-26-MIL MLB · MIL | 2026-10-29 03:16 | 0.956 | 0.990 | 0.810 | 0.906 | 0.920 | open | 5,767 | $1.0M | 39 % | 0.28 ¢ | $6.1K | 95.6K | buy file → |
| KXMLB-26-TB MLB · TB | 2026-10-29 03:16 | 0.045 | 0.109 | 0.011 | 0.098 | 0.077 | open | 9,425 | $142.9K | 73 % | 0.38 ¢ | $1.5K | 98.6K | buy file → |
2026-10-27 — 2 contracts, 12,475 trades, $706.4K turnover
The 2 most traded World Series contracts on 2026-10-27 — 0 closed Yes (≥ 0.97), 0 closed No (≤ 0.03), 2 still open at the last print: 12,475 trades, $706.4K USD turnover. The busiest contract was KXMLB-26-MIL with $620.2K turnover.
| Contract | Settles (UTC) | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXMLB-26-MIL MLB · MIL | 2026-10-29 03:16 | 0.824 | 0.966 | 0.791 | 0.956 | 0.949 | open | 5,554 | $620.2K | 49 % | 0.38 ¢ | $2.6K | 213.2K | buy file → |
| KXMLB-26-TB MLB · TB | 2026-10-29 03:16 | 0.158 | 0.207 | 0.031 | 0.045 | 0.050 | open | 6,921 | $86.2K | 72 % | 0.37 ¢ | $129.75 | 187.9K | buy file → |
2026-10-26 — 2 contracts, 4,469 trades, $283.9K turnover
The 2 most traded World Series contracts on 2026-10-26 — 0 closed Yes (≥ 0.97), 0 closed No (≤ 0.03), 2 still open at the last print: 4,469 trades, $283.9K USD turnover. The busiest contract was KXMLB-26-MIL with $206.5K turnover.
| Contract | Settles (UTC) | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXMLB-26-MIL MLB · MIL | 2026-10-29 03:16 | 0.840 | 0.860 | 0.823 | 0.824 | 0.833 | open | 2,101 | $206.5K | 27 % | 0.45 ¢ | $1.3K | 59.5K | buy file → |
| KXMLB-26-TB MLB · TB | 2026-10-29 03:16 | 0.160 | 0.178 | 0.153 | 0.158 | 0.170 | open | 2,368 | $77.4K | 83 % | 0.52 ¢ | $394.13 | 53.9K | buy file → |
MLB on Kalshi — market types across the series
Across 72 MLB series on Kalshi, 883,314 contracts have been listed as of 2026-11-02: player & team props 601,750 · total / over-under 90,394 · spread / handicap 30,874 · moneyline / winner 20,954 and others. Counted from every contract file of the family, not from the traded top-10.
| Market type | Contracts listed (all time) | Listed last 30 days | Share |
|---|---|---|---|
| player & team props | 601,750 | 7,269 | 68 % |
| total / over-under | 90,394 | 1,529 | 10 % |
| spread / handicap | 30,874 | 355 | 3 % |
| moneyline / winner | 20,954 | 1,087 | 2 % |
| period markets | 14,547 | 279 | 2 % |
| strike ladder | 212 | 0 | 0 % |
| other | 124,583 | 3,110 | 14 % |
| Total | 883,314 | 13,629 | 100 % |
Kalshi MLB 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 2026-11-02; “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.
How a World Series contract trades
On Kalshi, a World Series contract trades until its event settles, is listed roughly 2 min before it opens, and quotes in 0.1 ¢ price steps (0..1). Measured on the 10 contracts captured on 2026-11-01.
Try a World Series contract file for free
The busiest contract of a settled day, byte-identical to the files in the paid bundle — download the native tick file, a CSV/Parquet export, or replay its order book in the browser.
KXMLB-26-MIL minute by minute — 2026-10-24
One-minute open/high/low/close, trades, USD turnover, quoted spread and top-of-book depth of the sample contract — the same 1-minute statistics every instrument’s analytics page offers.
KXMLB-26-MIL traded in 972 of the day’s minutes (00:00–23:59 UTC): 6,395 trades, $382.8K turnover, opening at 0.635, ranging 0.630–0.750 and closing at 0.718.
| Minute (UTC) | Open | High | Low | Close | Trades | Turnover | Spread | Top-1 bid / ask |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 0.635 | 0.635 | 0.635 | 0.635 | 17 | $15.9K | 0.10 ¢ | $817.29 / $141.5K |
| 00:01 | 0.635 | 0.635 | 0.634 | 0.635 | 15 | $2.1K | 0.10 ¢ | $803.17 / $136.9K |
| 00:02 | 0.635 | 0.635 | 0.634 | 0.635 | 9 | $389.5 | 0.10 ¢ | $773.48 / $135.9K |
| 00:03 | 0.635 | 0.635 | 0.634 | 0.635 | 11 | $774.32 | 0.10 ¢ | $726.06 / $135.4K |
| 00:04 | 0.635 | 0.635 | 0.634 | 0.634 | 10 | $382.04 | 0.10 ¢ | $631.85 / $135.0K |
| 00:05 | 0.634 | 0.635 | 0.635 | 0.635 | 4 | $722.06 | 0.10 ¢ | $477.12 / $134.4K |
| 00:06 | 0.635 | 0.635 | 0.635 | 0.635 | 7 | $450.75 | 0.10 ¢ | $477.12 / $134.1K |
| 00:07 | 0.635 | 0.635 | 0.635 | 0.635 | 10 | $802.54 | 0.10 ¢ | $477.12 / $133.5K |
| 00:08 | 0.635 | 0.635 | 0.634 | 0.635 | 10 | $1.7K | 0.10 ¢ | $295.67 / $132.2K |
| 00:09 | 0.635 | 0.635 | 0.634 | 0.635 | 11 | $1.2K | 0.10 ¢ | $238.14 / $131.1K |
| 00:10 | 0.635 | 0.635 | 0.635 | 0.635 | 19 | $1.1K | 0.10 ¢ | $227 / $129.9K |
| 00:11 | 0.635 | 0.635 | 0.635 | 0.635 | 12 | $7.1K | 0.10 ¢ | $227 / $124.1K |
| 00:12 | 0.635 | 0.635 | 0.634 | 0.635 | 10 | $2.5K | 0.10 ¢ | $339.52 / $120.9K |
| 00:13 | 0.635 | 0.635 | 0.635 | 0.635 | 7 | $773.31 | 0.10 ¢ | $386.11 / $119.4K |
| 00:14 | 0.635 | 0.635 | 0.635 | 0.635 | 5 | $380.76 | 0.10 ¢ | $386.11 / $118.9K |
| 00:15 | 0.635 | 0.635 | 0.634 | 0.635 | 9 | $1.4K | 0.10 ¢ | $362.55 / $117.5K |
| 00:16 | 0.635 | 0.660 | 0.635 | 0.659 | 17 | $1.4K | 1.61 ¢ | $73.56 / $8.9K |
| 00:17 | 0.659 | 0.659 | 0.637 | 0.656 | 36 | $2.2K | 1.64 ¢ | $8.84 / $501.92 |
| 00:18 | 0.656 | 0.658 | 0.634 | 0.656 | 40 | $805.33 | 1.86 ¢ | $10.96 / $98.74 |
| 00:19 | 0.656 | 0.654 | 0.650 | 0.650 | 14 | $141 | 1.56 ¢ | $10.25 / $100.4 |
| 00:20 | 0.650 | 0.651 | 0.630 | 0.646 | 55 | $626.5 | 1.45 ¢ | $5.35 / $200 |
| 00:21 | 0.646 | 0.653 | 0.638 | 0.653 | 24 | $619.06 | 0.99 ¢ | $69.96 / $72.05 |
| 00:22 | 0.653 | 0.658 | 0.654 | 0.657 | 17 | $218.54 | 0.70 ¢ | $155.7 / $206.35 |
| 00:23 | 0.657 | 0.656 | 0.652 | 0.652 | 7 | $130.78 | 0.84 ¢ | $11.78 / $451.14 |
| 00:24 | 0.652 | 0.653 | 0.651 | 0.652 | 14 | $252.11 | 0.31 ¢ | $2.74 / $83.47 |
| 00:25 | 0.652 | 0.658 | 0.655 | 0.658 | 19 | $95.48 | 0.59 ¢ | $20.14 / $187.6 |
| 00:26 | 0.658 | 0.660 | 0.657 | 0.660 | 23 | $610.54 | 0.38 ¢ | $34.34 / $95.26 |
| 00:27 | 0.660 | 0.665 | 0.660 | 0.663 | 12 | $413.71 | 0.56 ¢ | $1.1K / $159.07 |
| 00:28 | 0.663 | 0.665 | 0.662 | 0.663 | 12 | $309.51 | 0.41 ¢ | $3.3K / $270.47 |
| 00:29 | 0.663 | 0.665 | 0.661 | 0.661 | 7 | $223.53 | 0.31 ¢ | $3.3K / $123.92 |
| 00:30 | 0.661 | 0.678 | 0.660 | 0.677 | 25 | $540.49 | 0.69 ¢ | $2.2K / $368.99 |
| 00:31 | 0.677 | 0.750 | 0.664 | 0.695 | 57 | $3.5K | 4.26 ¢ | $44.6 / $174.8 |
| 00:32 | 0.695 | 0.719 | 0.663 | 0.716 | 47 | $777.6 | 4.38 ¢ | $635.67 / $34.98 |
| 00:33 | 0.716 | 0.727 | 0.667 | 0.710 | 41 | $1.1K | 3.74 ¢ | $328.27 / $229.36 |
| 00:34 | 0.710 | 0.725 | 0.691 | 0.724 | 30 | $507 | 2.47 ¢ | $263.97 / $320.04 |
| 00:35 | 0.724 | 0.719 | 0.717 | 0.719 | 17 | $207.98 | 1.13 ¢ | $343.6 / $366.21 |
| 00:36 | 0.719 | 0.720 | 0.703 | 0.720 | 26 | $1.6K | 1.23 ¢ | $7.91 / $242.53 |
| 00:37 | 0.720 | 0.720 | 0.703 | 0.719 | 22 | $373.83 | 1.52 ¢ | $13.39 / $142.61 |
| 00:38 | 0.719 | 0.720 | 0.698 | 0.708 | 28 | $1.2K | 1.11 ¢ | $4.51 / $112.95 |
| 00:39 | 0.708 | 0.710 | 0.695 | 0.696 | 22 | $168.84 | 0.95 ¢ | $33.56 / $159.4 |
| 00:40 | 0.696 | 0.710 | 0.696 | 0.696 | 20 | $741.32 | 1.13 ¢ | $95.01 / $418.64 |
| 00:41 | 0.696 | 0.696 | 0.696 | 0.696 | 7 | $536.79 | 0.18 ¢ | $309.75 / $1.3K |
| 00:42 | 0.696 | 0.720 | 0.696 | 0.719 | 16 | $1.3K | 1.26 ¢ | $543.44 / $536.88 |
| 00:43 | 0.719 | 0.717 | 0.696 | 0.717 | 12 | $72.69 | 2.04 ¢ | $27.3 / $13.27 |
| 00:44 | 0.717 | 0.725 | 0.691 | 0.722 | 41 | $381.78 | 2.57 ¢ | $444.8 / $67.67 |
| 00:45 | 0.722 | 0.724 | 0.696 | 0.722 | 18 | $583.86 | 2.37 ¢ | $826.87 / $273.14 |
| 00:46 | 0.722 | 0.725 | 0.708 | 0.708 | 10 | $123.44 | 2.05 ¢ | $783.01 / $451.07 |
| 00:47 | 0.708 | 0.725 | 0.706 | 0.722 | 14 | $150.3 | 1.59 ¢ | $285.62 / $212.84 |
| 00:48 | 0.722 | 0.725 | 0.722 | 0.725 | 13 | $234.2 | 1.30 ¢ | $278.05 / $652.12 |
| 00:49 | 0.725 | 0.727 | 0.725 | 0.727 | 19 | $1.7K | 1.14 ¢ | $274.51 / $721.95 |
| 00:50 | 0.727 | 0.727 | 0.716 | 0.726 | 15 | $359.95 | 1.01 ¢ | $98.29 / $133.55 |
| 00:51 | 0.726 | 0.727 | 0.711 | 0.727 | 20 | $125.07 | 1.60 ¢ | $40.87 / $18.17 |
| 00:52 | 0.727 | 0.727 | 0.713 | 0.721 | 13 | $116.97 | 1.23 ¢ | $4.38 / $33.19 |
| 00:53 | 0.721 | 0.722 | 0.713 | 0.722 | 11 | $93.63 | 0.86 ¢ | $4.1 / $66.14 |
| 00:54 | 0.722 | 0.726 | 0.708 | 0.726 | 18 | $142.29 | 1.32 ¢ | $99.1 / $15.02 |
| 00:55 | 0.726 | 0.726 | 0.720 | 0.726 | 11 | $278.69 | 0.49 ¢ | $269.99 / $38.79 |
| 00:56 | 0.726 | 0.727 | 0.725 | 0.727 | 5 | $90.45 | 0.90 ¢ | $7.53 / $416 |
| 00:57 | 0.727 | 0.727 | 0.726 | 0.727 | 2 | $7.71 | 1.45 ¢ | $12.29 / $103.38 |
| 00:58 | 0.727 | 0.729 | 0.708 | 0.725 | 20 | $610.31 | 1.78 ¢ | $13.52 / $165.28 |
| 00:59 | 0.725 | 0.726 | 0.724 | 0.725 | 3 | $32.95 | 0.62 ¢ | $61.07 / $132.99 |
| 01:00 | 0.725 | 0.727 | 0.725 | 0.727 | 10 | $87.08 | 0.49 ¢ | $4.28 / $52.89 |
| 01:01 | 0.727 | 0.727 | 0.726 | 0.726 | 7 | $159.19 | 0.25 ¢ | $177.06 / $82.26 |
| 01:02 | 0.726 | 0.729 | 0.720 | 0.729 | 13 | $854.86 | 0.61 ¢ | $29.66 / $505.76 |
| 01:03 | 0.729 | 0.732 | 0.706 | 0.730 | 32 | $719.61 | 1.79 ¢ | $26.19 / $107.64 |
| 01:04 | 0.730 | 0.707 | 0.707 | 0.707 | 1 | $2.13 | 1.62 ¢ | $8.35 / $14.51 |
| 01:05 | 0.707 | 0.728 | 0.721 | 0.728 | 15 | $70.18 | 1.60 ¢ | $21.86 / $14.26 |
| 01:06 | 0.728 | 0.730 | 0.714 | 0.727 | 9 | $74.68 | 1.64 ¢ | $75.81 / $40.67 |
| 01:07 | 0.727 | 0.730 | 0.715 | 0.716 | 9 | $42.31 | 1.35 ¢ | $806.37 / $3.92 |
| 01:08 | 0.716 | 0.732 | 0.720 | 0.720 | 8 | $27.21 | 1.04 ¢ | $466.66 / $4.6 |
| 01:09 | 0.720 | 0.733 | 0.732 | 0.732 | 8 | $62.14 | 0.87 ¢ | $14.38 / $1.1K |
| 01:10 | 0.732 | 0.733 | 0.696 | 0.696 | 13 | $329.07 | 1.40 ¢ | $4.31 / $345.67 |
| 01:11 | 0.696 | 0.746 | 0.705 | 0.721 | 34 | $6.9K | 2.14 ¢ | $17.7 / $55.4 |
| 01:12 | 0.721 | 0.736 | 0.730 | 0.730 | 6 | $201.61 | 2.68 ¢ | $20.92 / $339.69 |
| 01:13 | 0.730 | 0.732 | 0.729 | 0.732 | 4 | $106.54 | 1.89 ¢ | $18.33 / $628.23 |
| 01:14 | 0.732 | 0.725 | 0.695 | 0.725 | 36 | $578.22 | 2.83 ¢ | $20.03 / $100.83 |
| 01:15 | 0.725 | 0.723 | 0.692 | 0.719 | 20 | $184.04 | 1.66 ¢ | $42.03 / $37.72 |
| 01:16 | 0.719 | 0.717 | 0.717 | 0.717 | 2 | $49.03 | 0.49 ¢ | $26.5 / $43.8 |
| 01:17 | 0.717 | 0.722 | 0.718 | 0.720 | 15 | $205.44 | 0.80 ¢ | $22.04 / $25.03 |
| 01:18 | 0.720 | 0.721 | 0.706 | 0.706 | 13 | $182.76 | 0.70 ¢ | $8.63 / $319.36 |
| 01:19 | 0.706 | 0.707 | 0.700 | 0.700 | 6 | $1.8K | 0.25 ¢ | $3.87 / $179.44 |
| 01:20 | 0.700 | 0.700 | 0.690 | 0.700 | 7 | $136.12 | 1.16 ¢ | $114.29 / $117.19 |
| 01:21 | 0.700 | 0.699 | 0.690 | 0.696 | 8 | $175.14 | 0.71 ¢ | $73.41 / $20.8 |
| 01:22 | 0.696 | 0.700 | 0.697 | 0.700 | 10 | $135.7 | 0.31 ¢ | $29.93 / $942.18 |
| 01:23 | 0.700 | 0.700 | 0.696 | 0.699 | 12 | $222.62 | 0.28 ¢ | $26.77 / $625.94 |
| 01:24 | 0.699 | 0.698 | 0.695 | 0.698 | 5 | $46.77 | 0.69 ¢ | $7.18 / $31.23 |
| 01:25 | 0.698 | 0.699 | 0.680 | 0.699 | 13 | $272.65 | 1.95 ¢ | $399.27 / $449.3 |
| 01:26 | 0.699 | 0.699 | 0.680 | 0.680 | 13 | $54.11 | 1.31 ¢ | $874.96 / $8.71 |
| 01:27 | 0.680 | 0.690 | 0.680 | 0.690 | 10 | $44.92 | 0.76 ¢ | $23.38 / $6.76 |
| 01:28 | 0.690 | 0.699 | 0.689 | 0.699 | 29 | $150.97 | 1.47 ¢ | $6.03 / $152.76 |
| 01:29 | 0.699 | 0.700 | 0.690 | 0.697 | 18 | $388.17 | 1.91 ¢ | $33.2 / $598.12 |
| 01:30 | 0.697 | 0.682 | 0.677 | 0.677 | 7 | $72.55 | 1.13 ¢ | $41.58 / $15.01 |
| 01:31 | 0.677 | 0.676 | 0.676 | 0.676 | 1 | $0.68 | 0.93 ¢ | $15.17 / $12.34 |
| 01:32 | 0.676 | 0.687 | 0.675 | 0.686 | 22 | $78.38 | 0.96 ¢ | $90.66 / $158.58 |
| 01:33 | 0.686 | 0.684 | 0.683 | 0.683 | 4 | $34.72 | 1.00 ¢ | $2.45 / $553.3 |
| 01:34 | 0.683 | 0.684 | 0.671 | 0.681 | 11 | $138.2 | 1.07 ¢ | $16.27 / $49.97 |
| 01:35 | 0.681 | 0.675 | 0.671 | 0.675 | 7 | $681.43 | 0.95 ¢ | $173.96 / $206.68 |
| 01:36 | 0.675 | 0.676 | 0.675 | 0.675 | 5 | $14.03 | 0.99 ¢ | $267 / $4.92 |
| 01:37 | 0.675 | 0.680 | 0.666 | 0.680 | 4 | $25.49 | 0.96 ¢ | $572.85 / $4.7 |
| 01:38 | 0.680 | 0.679 | 0.679 | 0.679 | 1 | $0.68 | 0.87 ¢ | $298.69 / $5.57 |
| 01:39 | 0.679 | 0.686 | 0.665 | 0.672 | 42 | $303.33 | 0.91 ¢ | $114.72 / $37.2 |
| 01:40 | 0.672 | 0.685 | 0.677 | 0.685 | 11 | $65.77 | 0.61 ¢ | $151.93 / $35.11 |
| 01:41 | 0.685 | 0.688 | 0.676 | 0.688 | 12 | $85.14 | 0.35 ¢ | $305.32 / $14.52 |
| 01:42 | 0.688 | 0.697 | 0.689 | 0.697 | 15 | $142.51 | 0.90 ¢ | $343.5 / $396.62 |
| 01:43 | 0.697 | 0.699 | 0.687 | 0.687 | 9 | $1.1K | 1.09 ¢ | $343.3 / $504.94 |
| 01:44 | 0.687 | 0.698 | 0.687 | 0.688 | 6 | $174.92 | 1.06 ¢ | $330.58 / $74.26 |
| 01:45 | 0.688 | 0.699 | 0.680 | 0.699 | 14 | $472.31 | 1.26 ¢ | $197.11 / $43.9 |
| 01:46 | 0.699 | 0.700 | 0.683 | 0.683 | 7 | $40.02 | 1.28 ¢ | $579.06 / $486.08 |
| 01:47 | 0.683 | 0.697 | 0.697 | 0.697 | 3 | $9.76 | 1.02 ¢ | $7.49 / $6.77 |
| 01:48 | 0.697 | 0.696 | 0.645 | 0.645 | 40 | $6.9K | 0.56 ¢ | $29.08 / $6.73 |
| 01:49 | 0.645 | 0.688 | 0.652 | 0.654 | 17 | $73.7 | 2.60 ¢ | $228.45 / $17.04 |
| 01:50 | 0.654 | 0.683 | 0.655 | 0.683 | 18 | $92.53 | 1.90 ¢ | $764.1 / $17.59 |
| 01:51 | 0.683 | 0.682 | 0.664 | 0.680 | 18 | $112.78 | 1.41 ¢ | $11.47 / $15.35 |
| 01:52 | 0.680 | 0.682 | 0.658 | 0.679 | 27 | $285.58 | 1.92 ¢ | $16.41 / $21.22 |
| 01:53 | 0.679 | 0.682 | 0.661 | 0.677 | 17 | $87.58 | 1.85 ¢ | $5.71 / $81.82 |
| 01:54 | 0.677 | 0.679 | 0.654 | 0.659 | 20 | $131.05 | 1.71 ¢ | $26.04 / $14.83 |
| 01:55 | 0.659 | 0.680 | 0.666 | 0.676 | 24 | $112.97 | 0.99 ¢ | $40.4 / $5.15 |
| 01:56 | 0.676 | 0.674 | 0.665 | 0.671 | 13 | $392.87 | 0.84 ¢ | $2.71 / $36.52 |
| 01:57 | 0.671 | 0.686 | 0.662 | 0.677 | 53 | $1.3K | 0.95 ¢ | $9.19 / $348.61 |
| 01:58 | 0.677 | 0.679 | 0.665 | 0.677 | 20 | $253.05 | 1.20 ¢ | $6.57 / $192.02 |
| 01:59 | 0.677 | 0.681 | 0.671 | 0.671 | 13 | $481.79 | 0.62 ¢ | $12.49 / $583.37 |
First 120 of 972 active minutes. 1-minute statistics computed from the recorded ticks; minutes without a trade are omitted. Spread in contract price cents; top-1 depth = resting notional at the best bid / best ask. Every minute of every day is in the free analytics; the raw ticks are in the sample file above.
Build a World Series model on this data
Every settled World Series contract is a labelled example: the winner, the line or the total that cleared is the label, and the day bundle holds each contract's full order-book path and trade tape, nanosecond-stamped, from the first quote days before the event to the last print — the features for that label. The statistics on this page cover the most traded contracts per day; the bundle holds every contract listed on Kalshi that day.
Split by season and match day, never at random — the contracts of one slate share injuries, weather and the same public money, and a random split leaks the slate's results into training; walk forward over game days and purge the days whose contracts were still open. The sports-model guide works the closing-line benchmark, the pre-game line path and that split through.
Purchased data is for your own use — backtesting, research, analytics and training your own models, in-house or in your own products; the trained models and derived data you build from it are yours. The raw files and tick streams themselves may not be redistributed, resold or published. The full terms are on the data license page.
Why buy Kalshi World Series 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
Kalshi World Series data — FAQ
What Kalshi World Series data can I download?
Tick-by-tick trades and Level-2 order-book depth for every contract of the World Series series on Kalshi (30 contract files on the latest day). One bundle = one UTC day of the whole series.
What is the Kalshi series ticker for World Series?
KXMLB — every contract of the series carries this prefix in its ticker (followed by the event date and strike). Files in a day bundle are named by the full contract ticker, so a bundle holds every KXMLB-* contract listed that UTC day.
How far back does the World Series data go?
Coverage runs March 2026 – present — 243 trading days in total.
What format are the Kalshi files in?
One zstd-compressed text file per contract per UTC day, in the same normalized schema as our crypto venues — see the market-data specification; free samples on the downloads page.
Can I get Kalshi World Series 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 Kalshi World Series historical data cost?
€1 per series-day bundle — every contract of the series for that day — no subscription, no minimum order; buy as a guest in the Data Shop and download immediately. Credit packs lower the effective price and never expire.
Do I need an account or a sales call?
No. Pick the World Series 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 Kalshi World Series 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.
How many World Series contracts trade per day on Kalshi?
On average 7 World Series contracts had at least one trade per UTC day over the last 30 captured days on Kalshi, with about 311.5K order-book level updates recorded per day. A day bundle contains every contract file of the series for that day.
How liquid are Kalshi World Series contracts?
Over the last 30 captured days, the turnover-weighted quoted bid-ask spread was 0.47 ¢ (contracts quote 0..1 = 100 ¢), the mean best-bid/best-ask notional was about $22.6K per side, 63 % of USD turnover was taker-buy. These figures are computed from the recorded Level-2 order books and trade prints — the same data in the day bundles.
What was the most traded World Series contract on 2026-11-01?
KXMLB-27-LAD (MLB · LAD) — $2.2K USD turnover over 175 trades on Kalshi. The 10 most traded contracts of the series did 475 trades and $4.0K that UTC day. Open, high, low, close and VWAP per contract are listed on this page; the tick-level data is in the day bundle.
What was the busiest World Series trading day on Kalshi?
2026-10-28, with $1.2M of USD turnover over 15,192 trades across every World Series contract of the day; the busiest full month was Oct 2026 at $10.1M. Since our statistics began on 2026-08-09 the series has recorded 497,901 trades and $13.3M over 85 captured days; the single biggest contract was KXMLB-26-MIL (MLB · MIL) on 2026-10-28 with $1.0M. Any of these days is a downloadable bundle.
Which market types does Kalshi list for MLB?
Kalshi lists each market type as its own series — 72 MLB series with 883,314 contracts listed as of 2026-11-02: player & team props 601,750 · total / over-under 90,394 · spread / handicap 30,874 · moneyline / winner 20,954 · period markets 14,547. World Series is one of them; a series-day bundle covers one series, so buy the same day across the sibling series you need in the shop.
Which weekday does Kalshi World Series trade most?
Tuesdays — about $504.8K of USD turnover per Tuesday and 21 % of the series' turnover over the 30 captured days to 2026-11-01 on Kalshi, summed from every trade print of the series' contracts. The weekday profile on this page shows all seven days; the day bundles carry the full tape behind them.
How much of World Series turnover trades on game day?
6 % — across 23 settled World Series contracts between 2026-08-09 and 2026-11-01 on Kalshi, 6 % of their USD turnover printed on the UTC day the contract settled and 94 % on the days before, summed from every trade of the most traded contracts per day. The pre-event share is where line-movement features live; the day bundles hold both.
How long before an event do World Series contracts trade?
A median of 11 captured trading days per contract, settlement day included (a quarter traded 48 days or more) — across 23 settled World Series contracts to 2026-11-01 on Kalshi, counting the UTC days a contract ranked among the series' most traded. Buy those days as a range (/shop/bundles?bundle=kalshi-kxmlb&d=<from>..<to>) to get the whole pre-event path of each contract.