Kalshi Big Brother Rank Historical Data
Every Kalshi “Big Brother Rank” contract of the day — every trade print and the complete Level-2 book, captured co-located with nanosecond venue and receive timestamps. 87 trading days as day bundles, €1 per day, bought as a guest with instant download.
Big Brother Rank on Kalshi — activity
Per-day trade and turnover statistics exist from July 2026 onward — a limit of the statistics, not of the capture: older days are archived in full (every contract, every message) without a statistics row.
One purchase, the whole series for a day
A series-day bundle contains every Big Brother Rank contract that was listed on Kalshi on that UTC day — traded or not — 6 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 July 2026 – October 2026 — 87 trading days, 439 MB compressed in total. A day typically holds 32 contract files (up to 34 on the busiest day, 89.6 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.
Big Brother Rank — development since capture
28,015 trades and $231.8K of USD turnover over 55 captured days since 2026-08-09 — record day 2026-10-02 with $58.6K, biggest single contract KXBIGBROTHERRANK-26DEC31R2-TAY (R2 · 2026-12-31 · TAY) (2026-10-02, $26.2K).
| Month | Days | Trades | Turnover (USD) | Avg / day | Contracts traded | L2 updates | vs previous month |
|---|---|---|---|---|---|---|---|
| Oct 2026 | 2 | 6,084 | $82.3K | $41.1K | 12 | 4.1M | −33.7 % |
| Sep 2026 | 30 | 17,480 | $124.1K | $4.1K | 435 | 8.3M | +390.1 % |
| Aug 2026 | 23 | 4,451 | $25.3K | $1.1K | 461 | 1.4M | — |
Kalshi Big Brother Rank — 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.
Big Brother Rank — 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-10-02 | 6 | 7.93 MB | 6 | 3,270 | $58.6K | 37 % | 3.33 ¢ | $19.3K | 292.7K | Buy day → | |
| 2026-10-01 | 6 | 89.6 MB | 6 | 2,814 | $23.6K | 74 % | 5.34 ¢ | $66.71 | 3.8M | Buy day → | |
| 2026-09-30 | 6 | 2.50 MB | 6 | 531 | $4.4K | 79 % | 1.66 ¢ | $268.21 | 92.4K | Buy day → | |
| 2026-09-29 | 6 | 1.02 MB | 6 | 384 | $4.2K | 67 % | 2.15 ¢ | $270.2 | 35.8K | Buy day → | |
| 2026-09-28 | 6 | 7.83 MB | 6 | 551 | $4.9K | 60 % | 2.29 ¢ | $197.77 | 311.2K | Buy day → | |
| 2026-09-27 | 6 | 9.50 MB | 6 | 592 | $3.5K | 67 % | 2.18 ¢ | $171.54 | 389.4K | Buy day → | |
| 2026-09-26 | 6 | 55.0 MB | 6 | 1,126 | $6.9K | 56 % | 2.81 ¢ | $41.59 | 2.3M | Buy day → | |
| 2026-09-25 | 34 | 17.5 MB | 8 | 2,039 | $26.5K | 58 % | 1.95 ¢ | $163.55 | 680.4K | Buy day → | |
| 2026-09-24 | 34 | 12.3 MB | 10 | 1,602 | $14.6K | 56 % | 1.72 ¢ | $77.02 | 468.1K | Buy day → | |
| 2026-09-23 | 34 | 15.9 MB | 9 | 1,030 | $9.5K | 46 % | 1.40 ¢ | $57.22 | 625.6K | Buy day → | |
| 2026-09-22 | 34 | 16.4 MB | 14 | 1,534 | $10.6K | 68 % | 2.21 ¢ | $40.67 | 621.9K | Buy day → | |
| 2026-09-21 | 34 | 11.1 MB | 16 | 1,112 | $5.6K | 58 % | 2.61 ¢ | $19.65 | 411.4K | Buy day → | |
| 2026-09-20 | 34 | 7.61 MB | 14 | 809 | $3.8K | 60 % | 1.96 ¢ | $67.91 | 282.4K | Buy day → | |
| 2026-09-19 | 34 | 4.20 MB | 15 | 428 | $2.9K | 51 % | 2.03 ¢ | $95.49 | 143.6K | Buy day → | |
| 2026-09-18 | 34 | 10.6 MB | 15 | 1,030 | $5.0K | 50 % | 3.06 ¢ | $61.85 | 298.9K | Buy day → | |
| 2026-09-17 | 34 | 4.69 MB | 14 | 295 | $953.6 | 52 % | 2.26 ¢ | $23.74 | 131.1K | Buy day → | |
| 2026-09-16 | 34 | 2.64 MB | 16 | 233 | $1.1K | 82 % | 2.64 ¢ | $34.37 | 86.1K | Buy day → | |
| 2026-09-15 | 34 | 6.21 MB | 18 | 136 | $720.47 | 41 % | 1.71 ¢ | $24.53 | 235.2K | Buy day → | |
| 2026-09-14 | 34 | 2.69 MB | 17 | 289 | $1.2K | 68 % | 1.51 ¢ | $39.05 | 94.7K | Buy day → | |
| 2026-09-13 | 34 | 2.28 MB | 15 | 198 | $821.63 | 66 % | 1.41 ¢ | $45.5 | 80.8K | Buy day → | |
| 2026-09-12 | 34 | 2.65 MB | 16 | 71 | $676.27 | 50 % | 1.12 ¢ | $149.84 | 58.3K | Buy day → | |
| 2026-09-11 | 34 | 1.78 MB | 19 | 363 | $1.7K | 80 % | 10.7 ¢ | $49.91 | 48.7K | Buy day → | |
| 2026-09-10 | 34 | 2.51 MB | 16 | 138 | $282.16 | 54 % | 2.13 ¢ | $13.05 | 87.6K | Buy day → | |
| 2026-09-09 | 34 | 2.39 MB | 18 | 391 | $1.6K | 70 % | 1.65 ¢ | $45.42 | 83.0K | Buy day → | |
| 2026-09-08 | 34 | 5.34 MB | 23 | 281 | $882.88 | 80 % | 2.62 ¢ | $44.02 | 200.1K | Buy day → | |
| 2026-09-07 | 34 | 2.16 MB | 17 | 226 | $730.12 | 90 % | 2.03 ¢ | $28.44 | 75.9K | Buy day → | |
| 2026-09-06 | 34 | 1.85 MB | 21 | 333 | $1.3K | 61 % | 2.10 ¢ | $21.18 | 62.2K | Buy day → | |
| 2026-09-05 | 34 | 1.34 MB | 16 | 167 | $598.56 | 48 % | 1.48 ¢ | $69.8 | 43.9K | Buy day → | |
| 2026-09-04 | 34 | 1.15 MB | 18 | 547 | $4.1K | 73 % | 1.88 ¢ | $79.43 | 34.1K | Buy day → | |
| 2026-09-03 | 34 | 4.37 MB | 20 | 478 | $3.2K | 56 % | 2.65 ¢ | $35.36 | 155.9K | 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 Big Brother Rank 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 6 most traded Big Brother Rank contracts on 2026-10-02 — 2 closed Yes (≥ 0.97), 4 closed No (≤ 0.03): 3,270 trades, $58.6K USD turnover. The busiest contract was KXBIGBROTHERRANK-26DEC31R2-TAY with $26.2K turnover.
| Contract | Settles (UTC) | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXBIGBROTHERRANK-26DEC31R2-TAY R2 · 2026-12-31 · TAY | 2026-10-02 03:30 | 0.500 | 0.990 | 0.050 | 0.990 | 0.820 | Yes | 837 | $26.2K | 23 % | 2.84 ¢ | $29.4K | 85.1K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-DRE R3 · 2026-12-31 · DRE | 2026-10-02 03:30 | 0.150 | 0.990 | 0.090 | 0.990 | 0.613 | Yes | 721 | $19.6K | 29 % | 1.91 ¢ | $18.2K | 54.2K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-DRE R2 · 2026-12-31 · DRE | 2026-10-02 03:30 | 0.520 | 0.860 | 0.010 | 0.010 | 0.125 | No | 518 | $5.0K | 81 % | 3.88 ¢ | $186.13 | 55.1K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-TAY R3 · 2026-12-31 · TAY | 2026-10-02 03:30 | 0.390 | 0.900 | 0.010 | 0.010 | 0.228 | No | 536 | $4.8K | 73 % | 11.4 ¢ | $210 | 69.2K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-RIC R2 · 2026-12-31 · RIC | 2026-10-02 03:30 | 0.070 | 0.120 | 0.010 | 0.010 | 0.040 | No | 505 | $2.5K | 72 % | 1.99 ¢ | $235.81 | 8.4K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-RIC R3 · 2026-12-31 · RIC | 2026-10-02 03:30 | 0.460 | 0.510 | 0.010 | 0.010 | 0.124 | No | 153 | $545.28 | 60 % | 7.03 ¢ | $191.4 | 20.7K | 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).
2026-10-01 — 6 contracts, 2,814 trades, $23.6K turnover
The 6 most traded Big Brother Rank contracts on 2026-10-01 — 0 closed Yes (≥ 0.97), 0 closed No (≤ 0.03), 6 still open at the last print: 2,814 trades, $23.6K USD turnover. The busiest contract was KXBIGBROTHERRANK-26DEC31R3-DRE with $7.1K turnover.
| Contract | Settles (UTC) | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXBIGBROTHERRANK-26DEC31R3-DRE R3 · 2026-12-31 · DRE | 2026-10-02 03:30 | 0.040 | 0.380 | 0.020 | 0.150 | 0.138 | open | 807 | $7.1K | 80 % | 5.34 ¢ | $20.52 | 313.0K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-DRE R2 · 2026-12-31 · DRE | 2026-10-02 03:30 | 0.600 | 0.820 | 0.300 | 0.520 | 0.544 | open | 494 | $5.3K | 79 % | 8.83 ¢ | $37.82 | 587.9K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-TAY R3 · 2026-12-31 · TAY | 2026-10-02 03:30 | 0.490 | 0.490 | 0.100 | 0.390 | 0.347 | open | 446 | $3.9K | 55 % | 4.22 ¢ | $141.58 | 893.4K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-TAY R2 · 2026-12-31 · TAY | 2026-10-02 03:30 | 0.370 | 0.680 | 0.320 | 0.500 | 0.494 | open | 487 | $3.7K | 70 % | 4.88 ¢ | $20.7 | 1.9M | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-RIC R3 · 2026-12-31 · RIC | 2026-10-02 03:30 | 0.490 | 0.560 | 0.420 | 0.460 | 0.486 | open | 171 | $1.8K | 74 % | 2.67 ¢ | $205.67 | 72.0K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-RIC R2 · 2026-12-31 · RIC | 2026-10-02 03:30 | 0.060 | 0.080 | 0.020 | 0.070 | 0.042 | open | 409 | $1.8K | 85 % | 1.02 ¢ | $127.08 | 12.3K | buy file → |
2026-09-30 — 6 contracts, 531 trades, $4.4K turnover
The 6 most traded Big Brother Rank contracts on 2026-09-30 — 0 closed Yes (≥ 0.97), 0 closed No (≤ 0.03), 6 still open at the last print: 531 trades, $4.4K USD turnover. The busiest contract was KXBIGBROTHERRANK-26DEC31R2-DRE with $1.3K turnover.
| Contract | Settles (UTC) | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXBIGBROTHERRANK-26DEC31R2-DRE R2 · 2026-12-31 · DRE | 2026-10-02 03:30 | 0.630 | 0.670 | 0.590 | 0.600 | 0.630 | open | 59 | $1.3K | 95 % | 2.87 ¢ | $50.72 | 52.2K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-TAY R3 · 2026-12-31 · TAY | 2026-10-02 03:30 | 0.470 | 0.490 | 0.470 | 0.490 | 0.481 | open | 41 | $1.1K | 76 % | 1.00 ¢ | $861.67 | 4.5K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-TAY R2 · 2026-12-31 · TAY | 2026-10-02 03:30 | 0.360 | 0.440 | 0.360 | 0.370 | 0.374 | open | 116 | $790.69 | 51 % | 1.26 ¢ | $28.09 | 19.1K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-RIC R2 · 2026-12-31 · RIC | 2026-10-02 03:30 | 0.050 | 0.090 | 0.040 | 0.060 | 0.063 | open | 128 | $645.1 | 96 % | 1.13 ¢ | $38.05 | 7.2K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-DRE R3 · 2026-12-31 · DRE | 2026-10-02 03:30 | 0.040 | 0.090 | 0.010 | 0.040 | 0.042 | open | 157 | $364.53 | 78 % | 1.37 ¢ | $10.87 | 2.3K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-RIC R3 · 2026-12-31 · RIC | 2026-10-02 03:30 | 0.500 | 0.500 | 0.480 | 0.490 | 0.485 | open | 30 | $149.77 | 45 % | 1.24 ¢ | $552.32 | 7.0K | buy file → |
2026-09-29 — 6 contracts, 384 trades, $4.2K turnover
The 6 most traded Big Brother Rank contracts on 2026-09-29 — 0 closed Yes (≥ 0.97), 0 closed No (≤ 0.03), 6 still open at the last print: 384 trades, $4.2K USD turnover. The busiest contract was KXBIGBROTHERRANK-26DEC31R2-DRE with $2.5K turnover.
| Contract | Settles (UTC) | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXBIGBROTHERRANK-26DEC31R2-DRE R2 · 2026-12-31 · DRE | 2026-10-02 03:30 | 0.620 | 0.640 | 0.570 | 0.630 | 0.613 | open | 73 | $2.5K | 73 % | 2.79 ¢ | $262.39 | 5.6K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-RIC R3 · 2026-12-31 · RIC | 2026-10-02 03:30 | 0.510 | 0.510 | 0.480 | 0.500 | 0.490 | open | 27 | $430.14 | 18 % | 1.00 ¢ | $588.64 | 1.9K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-TAY R2 · 2026-12-31 · TAY | 2026-10-02 03:30 | 0.390 | 0.400 | 0.340 | 0.360 | 0.389 | open | 71 | $403.35 | 51 % | 1.40 ¢ | $112.42 | 8.8K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-TAY R3 · 2026-12-31 · TAY | 2026-10-02 03:30 | 0.480 | 0.480 | 0.470 | 0.470 | 0.477 | open | 32 | $394.61 | 66 % | 1.00 ¢ | $443.49 | 6.3K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-DRE R3 · 2026-12-31 · DRE | 2026-10-02 03:30 | 0.050 | 0.070 | 0.020 | 0.040 | 0.052 | open | 114 | $306.02 | 85 % | 1.51 ¢ | $9.06 | 5.6K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-RIC R2 · 2026-12-31 · RIC | 2026-10-02 03:30 | 0.040 | 0.060 | 0.030 | 0.050 | 0.049 | open | 67 | $168.64 | 97 % | 1.01 ¢ | $21.35 | 7.5K | buy file → |
2026-09-28 — 6 contracts, 551 trades, $4.9K turnover
The 6 most traded Big Brother Rank contracts on 2026-09-28 — 0 closed Yes (≥ 0.97), 0 closed No (≤ 0.03), 6 still open at the last print: 551 trades, $4.9K USD turnover. The busiest contract was KXBIGBROTHERRANK-26DEC31R2-DRE with $2.3K turnover.
| Contract | Settles (UTC) | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXBIGBROTHERRANK-26DEC31R2-DRE R2 · 2026-12-31 · DRE | 2026-10-02 03:30 | 0.640 | 0.640 | 0.520 | 0.620 | 0.603 | open | 120 | $2.3K | 60 % | 3.37 ¢ | $167.98 | 75.5K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-TAY R2 · 2026-12-31 · TAY | 2026-10-02 03:30 | 0.370 | 0.490 | 0.320 | 0.390 | 0.390 | open | 102 | $784.83 | 53 % | 1.74 ¢ | $59.53 | 195.4K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-TAY R3 · 2026-12-31 · TAY | 2026-10-02 03:30 | 0.490 | 0.500 | 0.460 | 0.480 | 0.475 | open | 68 | $657.02 | 31 % | 1.46 ¢ | $416.9 | 11.8K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-RIC R3 · 2026-12-31 · RIC | 2026-10-02 03:30 | 0.490 | 0.520 | 0.470 | 0.510 | 0.487 | open | 36 | $638.41 | 86 % | 1.06 ¢ | $409.35 | 5.8K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-RIC R2 · 2026-12-31 · RIC | 2026-10-02 03:30 | 0.040 | 0.090 | 0.030 | 0.040 | 0.051 | open | 116 | $362.8 | 76 % | 1.05 ¢ | $26.03 | 4.6K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-DRE R3 · 2026-12-31 · DRE | 2026-10-02 03:30 | 0.080 | 0.090 | 0.020 | 0.050 | 0.050 | open | 109 | $214.97 | 75 % | 1.33 ¢ | $6.37 | 18.0K | buy file → |
2026-09-27 — 6 contracts, 592 trades, $3.5K turnover
The 6 most traded Big Brother Rank contracts on 2026-09-27 — 0 closed Yes (≥ 0.97), 0 closed No (≤ 0.03), 6 still open at the last print: 592 trades, $3.5K USD turnover. The busiest contract was KXBIGBROTHERRANK-26DEC31R2-DRE with $907.39 turnover.
| Contract | Settles (UTC) | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXBIGBROTHERRANK-26DEC31R2-DRE R2 · 2026-12-31 · DRE | 2026-10-02 03:30 | 0.620 | 0.680 | 0.410 | 0.640 | 0.632 | open | 192 | $907.39 | 83 % | 4.30 ¢ | $64.98 | 318.2K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-TAY R2 · 2026-12-31 · TAY | 2026-10-02 03:30 | 0.360 | 0.500 | 0.330 | 0.370 | 0.373 | open | 110 | $700.12 | 93 % | 2.11 ¢ | $86.58 | 40.8K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-TAY R3 · 2026-12-31 · TAY | 2026-10-02 03:30 | 0.500 | 0.500 | 0.460 | 0.490 | 0.475 | open | 69 | $647.16 | 39 % | 1.28 ¢ | $516.98 | 9.3K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-RIC R2 · 2026-12-31 · RIC | 2026-10-02 03:30 | 0.050 | 0.060 | 0.020 | 0.040 | 0.044 | open | 106 | $550.5 | 87 % | 1.01 ¢ | $53.96 | 4.9K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-RIC R3 · 2026-12-31 · RIC | 2026-10-02 03:30 | 0.510 | 0.510 | 0.480 | 0.490 | 0.482 | open | 28 | $529.33 | 17 % | 1.05 ¢ | $220.72 | 3.2K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-DRE R3 · 2026-12-31 · DRE | 2026-10-02 03:30 | 0.070 | 0.090 | 0.040 | 0.080 | 0.066 | open | 87 | $185.65 | 86 % | 1.95 ¢ | $16.96 | 13.1K | buy file → |
2026-09-26 — 6 contracts, 1,126 trades, $6.9K turnover
The 6 most traded Big Brother Rank contracts on 2026-09-26 — 0 closed Yes (≥ 0.97), 0 closed No (≤ 0.03), 6 still open at the last print: 1,126 trades, $6.9K USD turnover. The busiest contract was KXBIGBROTHERRANK-26DEC31R2-DRE with $2.3K turnover.
| Contract | Settles (UTC) | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXBIGBROTHERRANK-26DEC31R2-DRE R2 · 2026-12-31 · DRE | 2026-10-02 03:30 | 0.580 | 0.690 | 0.520 | 0.620 | 0.616 | open | 208 | $2.3K | 64 % | 3.17 ¢ | $67.58 | 69.5K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-RIC R2 · 2026-12-31 · RIC | 2026-10-02 03:30 | 0.020 | 0.310 | 0.010 | 0.050 | 0.050 | open | 410 | $1.4K | 63 % | 1.42 ¢ | $17.54 | 12.9K | buy file → |
| KXBIGBROTHERRANK-26DEC31R2-TAY R2 · 2026-12-31 · TAY | 2026-10-02 03:30 | 0.430 | 0.520 | 0.200 | 0.360 | 0.298 | open | 180 | $1.2K | 33 % | 4.25 ¢ | $11.51 | 2.0M | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-RIC R3 · 2026-12-31 · RIC | 2026-10-02 03:30 | 0.490 | 0.540 | 0.450 | 0.510 | 0.474 | open | 80 | $864.37 | 25 % | 2.44 ¢ | $43.27 | 30.1K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-TAY R3 · 2026-12-31 · TAY | 2026-10-02 03:30 | 0.460 | 0.500 | 0.400 | 0.500 | 0.476 | open | 113 | $773.63 | 73 % | 2.53 ¢ | $69.22 | 147.4K | buy file → |
| KXBIGBROTHERRANK-26DEC31R3-DRE R3 · 2026-12-31 · DRE | 2026-10-02 03:30 | 0.050 | 0.100 | 0.030 | 0.070 | 0.076 | open | 135 | $379.41 | 89 % | 2.70 ¢ | $14.41 | 9.9K | buy file → |
How a Big Brother Rank contract trades
On Kalshi, a Big Brother Rank contract trades for about 86 days from open to close, is listed roughly 30 min before it opens, and quotes in 1 ¢ price steps (0..1). Measured on the 6 contracts captured on 2026-10-02.
Build a Big Brother Rank model on this data
Every resolved Big Brother Rank contract is a labelled example — a count, a score, a date or a name — and the day bundle holds its full order-book path and trade tape, nanosecond-stamped. The statistics on this page cover the most traded contracts per day; the bundle holds every contract listed on Kalshi that day.
Split by time, never at random — adjacent contracts share a regime, and a random split leaks it into the test set. The training-data hub covers labels, leakage and walk-forward validation.
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 Big Brother Rank 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 Big Brother Rank data — FAQ
What Kalshi Big Brother Rank data can I download?
Tick-by-tick trades and Level-2 order-book depth for every contract of the Big Brother Rank series on Kalshi (6 contract files on the latest day). One bundle = one UTC day of the whole series.
What is the Kalshi series ticker for Big Brother Rank?
KXBIGBROTHERRANK — 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 KXBIGBROTHERRANK-* contract listed that UTC day.
How far back does the Big Brother Rank data go?
Coverage runs July 2026 – October 2026 — 87 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 Big Brother Rank 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 Big Brother Rank 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 Big Brother Rank 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 Big Brother Rank 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 most traded Big Brother Rank contract on 2026-10-02?
KXBIGBROTHERRANK-26DEC31R2-TAY (R2 · 2026-12-31 · TAY) — $26.2K USD turnover over 837 trades on Kalshi. The 6 most traded contracts of the series did 3,270 trades and $58.6K 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 Big Brother Rank trading day on Kalshi?
2026-10-02, with $58.6K of USD turnover over 3,270 trades across every Big Brother Rank contract of the day; the busiest full month was Sep 2026 at $124.1K. Since our statistics began on 2026-08-09 the series has recorded 28,015 trades and $231.8K over 55 captured days; the single biggest contract was KXBIGBROTHERRANK-26DEC31R2-TAY (R2 · 2026-12-31 · TAY) on 2026-10-02 with $26.2K. Any of these days is a downloadable bundle.
How much of Big Brother Rank turnover trades on event day?
27 % — across 22 settled Big Brother Rank contracts between 2026-08-09 and 2026-10-02 on Kalshi, 27 % of their USD turnover printed on the UTC day the contract settled and 73 % 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 Big Brother Rank contracts trade?
A median of 22 captured trading days per contract, settlement day included (a quarter traded 31 days or more) — across 22 settled Big Brother Rank contracts to 2026-10-02 on Kalshi, counting the UTC days a contract ranked among the series' most traded. Buy those days as a range (/shop/bundles?bundle=kalshi-kxbigbrotherrank&d=<from>..<to>) to get the whole pre-event path of each contract.