Supreme Court & Congress Prediction Market Da
Tick-by-tick trades and L2 order-book depth for 9 Supreme Court & Congress series on Kalshi — Next Supreme Court justice (KXSCOURT), SCOTUS confirmations, bills signed into law, congressional testimony, congress trades, VP tie-break votes, next DNC chair, Senate leadership. 1,923 series-days covering March 2026 – present; 2.6K trades · $22.1K 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.
Supreme Court & Congress on Kalshi
Next SCOTUS justice, confirmations and resignations, bills becoming law, congressional testimony and trades, VP tie-breaks, party leadership.
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 Supreme Court & Congress 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 | Bills become law this year? | Kalshi | 1,550 | $14.1K | 30 | Buy days |
| 2 | Who will win the next Senate Democratic Leader election? | Kalshi | 179 | $4.0K | 30 | Buy days |
| 3 | Next SCOTUS justice | Kalshi | 522 | $1.7K | 30 | Buy days |
| 4 | Congress Testify this year? | Kalshi | 96 | $906.27 | 30 | Buy days |
| 5 | SCOTUS confirmations | Kalshi | 121 | $867.15 | 30 | Buy days |
| 6 | Fed governor nominee | Kalshi | 33 | $266.13 | 30 | Buy days |
| 7 | VP tiebreaks | Kalshi | 10 | $158.31 | 30 | Buy days |
| 8 | Congress trades | Kalshi | 23 | $16.24 | 30 | Buy days |
| 9 | Next DNC chair? | Kalshi | 20 | $10.79 | 30 | 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.
Supreme Court & Congress — development since capture
4,497 trades and $33.2K of USD turnover across 9 series since 2026-08-09; busiest single series-day 2026-09-16 with $2.6K, biggest contract KXBILLS-NIL (2026-09-15, $1.9K).
| Month | Series active | Days | Trades | Turnover (USD) | Avg / day | Contracts traded | L2 updates | vs previous month |
|---|---|---|---|---|---|---|---|---|
| Oct 2026 (month to date) | 9 | 12 | 1,247 | $9.2K | $769.36 | 206 | 2.9M | — |
| Sep 2026 | 9 | 30 | 2,003 | $17.1K | $568.44 | 503 | 5.2M | +146.5 % |
| Aug 2026 | 9 | 23 | 1,247 | $6.9K | $300.73 | 383 | 2.8M | — |
Supreme Court & Congress 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.
Supreme Court & Congress — turnover by weekday
Wednesdays are the busiest day at about $1.1K of USD turnover, averaged over the captured days of the last 30.
| Weekday (UTC) | Avg turnover / day | USD | Avg trades | Days |
|---|---|---|---|---|
| Monday | $314.87 | 61.8 | 5 | |
| Tuesday | $953.22 | 94.5 | 4 | |
| Wednesday | $1.1K | 109.25 | 4 | |
| Thursday | $855.24 | 84.25 | 4 | |
| Friday | $775.53 | 70.75 | 4 | |
| Saturday | $698.34 | 86.25 | 4 | |
| Sunday | $592.03 | 93 | 5 |
Supreme Court & Congress 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 Supreme Court & Congress series — 30 days vs the 30 before
| # | Series | Venue | Turnover (30d) | Prior 30d | Growth (avg / day) | Trades (30d) |
|---|---|---|---|---|---|---|
| 1 | Bills become law this year? | Kalshi | $14.1K | $5.5K | +154.5 % | 1,550 |
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.
Supreme Court & Congress prediction markets — trades and turnover per day
Every captured UTC day of the last 30, summed over the 9 Supreme Court & Congress 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 | 9 | 14 | 79 | $411.4 | 97 % | 225.4K |
| 2026-10-11 | 9 | 20 | 236 | $731.39 | 37 % | 245.8K |
| 2026-10-10 | 9 | 13 | 111 | $1.1K | 73 % | 186.6K |
| 2026-10-09 | 9 | 16 | 43 | $160.45 | 29 % | 269.3K |
| 2026-10-08 | 9 | 17 | 142 | $1.3K | 62 % | 454.7K |
| 2026-10-07 | 9 | 17 | 138 | $650.86 | 70 % | 350.9K |
| 2026-10-06 | 9 | 21 | 160 | $1.0K | 33 % | 235.6K |
| 2026-10-05 | 9 | 13 | 53 | $105.2 | 67 % | 174.6K |
| 2026-10-04 | 9 | 12 | 53 | $304.14 | 25 % | 137.5K |
| 2026-10-03 | 9 | 27 | 102 | $812.08 | 74 % | 151.2K |
| 2026-10-02 | 9 | 18 | 66 | $2.0K | 76 % | 219.7K |
| 2026-10-01 | 9 | 18 | 64 | $665.43 | 18 % | 232.4K |
| 2026-09-30 | 9 | 21 | 93 | $1.1K | 59 % | 218.5K |
| 2026-09-29 | 9 | 18 | 86 | $430.35 | 73 % | 233.7K |
| 2026-09-28 | 9 | 18 | 65 | $273.82 | 82 % | 130.9K |
| 2026-09-27 | 9 | 11 | 61 | $963.5 | 67 % | 98.9K |
| 2026-09-26 | 9 | 30 | 104 | $689.91 | 63 % | 173.5K |
| 2026-09-25 | 9 | 28 | 103 | $447.81 | 60 % | 326.2K |
| 2026-09-24 | 9 | 8 | 43 | $945.39 | 13 % | 214.3K |
| 2026-09-23 | 9 | 9 | 20 | $22.9 | 86 % | 214.6K |
| 2026-09-22 | 9 | 17 | 61 | $324.56 | 75 % | 230.1K |
| 2026-09-21 | 9 | 15 | 50 | $386.26 | 70 % | 292.7K |
| 2026-09-20 | 9 | 19 | 67 | $661.71 | 59 % | 170.3K |
| 2026-09-19 | 9 | 10 | 28 | $150.08 | 33 % | 118.1K |
| 2026-09-18 | 9 | 15 | 71 | $528.67 | 84 % | 134.6K |
| 2026-09-17 | 9 | 22 | 88 | $546.13 | 11 % | 137.4K |
| 2026-09-16 | 9 | 17 | 186 | $2.7K | 53 % | 312.5K |
| 2026-09-15 | 9 | 19 | 71 | $2.0K | 63 % | 241.3K |
| 2026-09-14 | 9 | 14 | 62 | $397.69 | 87 % | 221.5K |
| 2026-09-13 | 9 | 13 | 48 | $299.42 | 51 % | 101.8K |
Per UTC day, summed over every Supreme Court & Congress 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 Supreme Court & Congress 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 | |
|---|---|---|---|---|---|---|---|
| KXBILLS-NIL | Bills become law this year? | Kalshi | 0.150 → 0.320 | open | 8 | $306.94 | buy file → |
| KXBILLS-TV | Bills become law this year? | Kalshi | 0.099 → 0.130 | open | 15 | $25.05 | buy file → |
| KXBILLS-FISA | Bills become law this year? | Kalshi | 0.063 → 0.110 | open | 12 | $18.21 | buy file → |
| KXBILLS-AIO | Bills become law this year? | Kalshi | 0.170 → 0.230 | open | 6 | $13.06 | buy file → |
| KXBILLS-CHIP | Bills become law this year? | Kalshi | 0.280 → 0.280 | open | 2 | $11.2 | buy file → |
| KXBILLS-DATA | Bills become law this year? | Kalshi | 0.100 → 0.160 | open | 9 | $9.12 | buy file → |
| KXBILLS-250C | Bills become law this year? | Kalshi | 0.087 → 0.088 | open | 2 | $8.79 | buy file → |
| KXBILLS-SMITH | Bills become law this year? | Kalshi | 0.027 → 0.076 | open | 9 | $6.83 | buy file → |
| KXBILLS-EVFEE | Bills become law this year? | Kalshi | 0.100 → 0.100 | open | 2 | $4.6 | buy file → |
| KXBILLS-CCR | Bills become law this year? | Kalshi | 0.110 → 0.088 | open | 3 | $3.51 | 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.
Kalshi Supreme Court & Congress 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 | |
|---|---|---|---|---|---|---|---|
| Bills become law this year? | Kalshi | annual | 223 | March 2026 – present | 220 MB | €1 | Buy days |
| Next SCOTUS justice | Kalshi | event | 223 | March 2026 – present | 119 MB | €1 | Buy days |
| Congress trades | Kalshi | annual | 223 | March 2026 – present | 102 MB | €1 | Buy days |
| Congress Testify this year? | Kalshi | annual | 223 | March 2026 – present | 48.6 MB | €1 | Buy days |
| Fed governor nominee | Kalshi | event | 223 | March 2026 – present | 46.9 MB | €1 | Buy days |
| Next DNC chair? | Kalshi | event | 139 | May 2026 – present | 29.3 MB | €1 | Buy days |
| SCOTUS confirmations | Kalshi | event | 223 | March 2026 – present | 28.8 MB | €1 | Buy days |
| Who will win the next Senate Democratic Leader election? | Kalshi | event | 223 | March 2026 – present | 24.8 MB | €1 | Buy days |
| VP tiebreaks | Kalshi | event | 223 | March 2026 – present | 17.5 MB | €1 | Buy days |
Why buy Supreme Court & Congress 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
Supreme Court & Congress prediction-market data — FAQ
Does Kalshi have Supreme Court markets?
Yes — next justice, confirmations and resignation series, plus congressional markets: bills becoming law, testimony, member trades, VP tie-breaks, the next DNC chair, Senate Democratic leader and Fed-governor nominations.
How is this 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 Supreme Court & Congress data go?
Coverage runs March 2026 – present — 1,923 series-days across 9 series on Kalshi. Each series page lists its exact span.
Can I get Supreme Court & Congress 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 Supreme Court & Congress 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 Supreme Court & Congress 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 Supreme Court & Congress 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 Supreme Court & Congress trading day?
2026-09-16 — $2.6K of USD turnover over 170 trades in a single series-day. Since our statistics began on 2026-08-09, 9 Supreme Court & Congress series recorded 4,497 trades and $33.2K in total; the biggest single contract was KXBILLS-NIL on 2026-09-15 at $1.9K. Wednesdays are the busiest weekday at about $1.1K per day.