Midterms, House & Senate Prediction Market Da
Tick-by-tick trades and L2 order-book depth for 43 Midterms, House & Senate series on Kalshi & Polymarket — midterm margin of victory, midterm voter turnout, House race winners, state ballot measures, political fundraising. 8,459 series-days covering November 2025 – present; 575.4K trades · $21.2M 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.
Midterms, House & Senate on Kalshi & Polymarket
Midterm margins and turnout, House race winners, ballot measures, fundraising.
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 Midterms, House & Senate 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 | House Race Winner? | Kalshi | 86,242 | $6.5M | 30 | Buy days |
| 2 | Midterm margin of victory | Kalshi | 120,128 | $3.4M | 30 | Buy days |
| 3 | California Governor's race | Kalshi | 16,648 | $2.4M | 30 | Buy days |
| 4 | 2026 House Election Winners — Republican party (per district) | Polymarket | 31,547 | $2.1M | 30 | Buy days |
| 5 | 2026 House Election Winners — Democratic party (per district) | Polymarket | 34,159 | $1.8M | 30 | Buy days |
| 6 | Democratic Senate seats | Kalshi | 20,028 | $1.1M | 30 | Buy days |
| 7 | 2026 House Election Margins of Victory — Democratic candidates | Polymarket | 89,885 | $770.9K | 30 | Buy days |
| 8 | 2026 House Election Margins of Victory — Republican candidates | Polymarket | 93,343 | $705.9K | 30 | Buy days |
| 9 | Republican senate seats | Kalshi | 10,918 | $405.1K | 30 | Buy days |
| 10 | State legislature winners | Kalshi | 4,599 | $400.2K | 30 | 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.
Midterms, House & Senate activity per venue
| Venue | Series | With stats | Trades (30d) | Turnover (30d) |
|---|---|---|---|---|
| Kalshi | 39 | 30 | 326,507 | $15.9M |
| Polymarket | 4 | 4 | 248,934 | $5.3M |
30 days to 2026-11-01, from our own daily statistics per contract.
Midterms, House & Senate — development since capture
943,085 trades and $43.5M of USD turnover across 40 series since 2026-07-08; busiest single series-day 2026-08-12 with $5.1M, biggest contract KXGOVFLNOMR-26-BD (2026-08-18, $4.0M).
| Month | Series active | Days | Trades | Turnover (USD) | Avg / day | Contracts traded | L2 updates | vs previous month |
|---|---|---|---|---|---|---|---|---|
| Nov 2026 (month to date) | 33 | 1 | 40,913 | $1.6M | $1.6M | 4,187 | 154.4M | — |
| Oct 2026 | 34 | 31 | 549,784 | $20.1M | $647.2K | 81,312 | 3.6B | +379.0 % |
| Sep 2026 | 35 | 30 | 191,362 | $4.2M | $139.6K | 50,440 | 2.3B | −75.8 % |
| Aug 2026 | 32 | 31 | 150,795 | $17.3M | $557.5K | 20,368 | 897.4M | +4815.3 % |
| Jul 2026 | 4 | 24 | 10,231 | $351.6K | $14.6K | — | — | — |
Midterms, House & Senate 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.
Midterms, House & Senate — turnover by weekday
Fridays are the busiest day at about $914.0K of USD turnover, averaged over the captured days of the last 30.
| Weekday (UTC) | Avg turnover / day | USD | Avg trades | Days |
|---|---|---|---|---|
| Monday | $521.9K | 15.4K | 4 | |
| Tuesday | $617.1K | 17.2K | 4 | |
| Wednesday | $806.2K | 19.1K | 4 | |
| Thursday | $871.7K | 23.0K | 4 | |
| Friday | $914.0K | 23.4K | 4 | |
| Saturday | $648.4K | 17.6K | 5 | |
| Sunday | $608.3K | 19.0K | 5 |
Midterms, House & Senate 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 Midterms, House & Senate series — 30 days vs the 30 before
| # | Series | Venue | Turnover (30d) | Prior 30d | Growth (avg / day) | Trades (30d) |
|---|---|---|---|---|---|---|
| 1 | State legislature winners | Kalshi | $400.2K | $4.3K | +9272.9 % | 4,599 |
| 2 | Republican senate seats | Kalshi | $405.1K | $39.7K | +921.6 % | 10,918 |
| 3 | Midterm margin of victory | Kalshi | $3.4M | $422.9K | +712.7 % | 120,128 |
| 4 | House Race Winner? | Kalshi | $6.5M | $850.8K | +663.6 % | 86,242 |
| 5 | Voter turnout in the national House popular vote? | Kalshi | $12.1K | $1.7K | +619.7 % | 1,200 |
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.
Midterms, House & Senate prediction markets — trades and turnover per day
Every captured UTC day of the last 30, summed over the 43 Midterms, House & Senate 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 | 33 | 4,187 | 40,913 | $1.6M | 58 % | 154.4M |
| 2026-10-31 | 33 | 4,001 | 39,809 | $1.9M | 55 % | 132.1M |
| 2026-10-30 | 33 | 4,297 | 47,887 | $1.7M | 66 % | 134.7M |
| 2026-10-29 | 33 | 4,263 | 39,874 | $1.7M | 52 % | 120.0M |
| 2026-10-28 | 33 | 3,747 | 33,221 | $1.5M | 57 % | 134.4M |
| 2026-10-27 | 33 | 3,778 | 30,060 | $1.0M | 51 % | 141.6M |
| 2026-10-26 | 33 | 3,852 | 29,108 | $853.1K | 52 % | 147.8M |
| 2026-10-25 | 33 | 3,334 | 23,085 | $743.6K | 46 % | 141.8M |
| 2026-10-24 | 33 | 2,804 | 18,936 | $568.6K | 50 % | 123.8M |
| 2026-10-23 | 33 | 2,918 | 22,921 | $969.1K | 51 % | 124.5M |
| 2026-10-22 | 33 | 3,326 | 29,507 | $1.1M | 51 % | 137.2M |
| 2026-10-21 | 34 | 2,618 | 21,806 | $1.1M | 64 % | 121.2M |
| 2026-10-20 | 34 | 2,449 | 17,756 | $768.3K | 54 % | 130.3M |
| 2026-10-19 | 34 | 2,423 | 12,779 | $523.5K | 58 % | 118.5M |
| 2026-10-18 | 34 | 1,892 | 9,276 | $270.4K | 58 % | 116.4M |
| 2026-10-17 | 34 | 1,712 | 9,581 | $388.4K | 60 % | 92.8M |
| 2026-10-16 | 34 | 2,259 | 12,265 | $564.1K | 67 % | 134.2M |
| 2026-10-15 | 34 | 2,565 | 13,498 | $427.7K | 59 % | 121.1M |
| 2026-10-14 | 34 | 2,378 | 13,026 | $498.4K | 63 % | 119.6M |
| 2026-10-13 | 34 | 2,347 | 13,279 | $467.6K | 49 % | 112.3M |
| 2026-10-12 | 34 | 2,273 | 11,369 | $351.2K | 50 % | 101.2M |
| 2026-10-11 | 34 | 2,647 | 14,471 | $229.8K | 61 % | 117.0M |
| 2026-10-10 | 34 | 2,593 | 13,641 | $236.6K | 57 % | 132.5M |
| 2026-10-09 | 34 | 2,187 | 10,676 | $445.9K | 57 % | 102.7M |
| 2026-10-08 | 34 | 2,137 | 9,118 | $262.1K | 62 % | 97.6M |
| 2026-10-07 | 34 | 1,754 | 8,345 | $204.1K | 60 % | 96.9M |
| 2026-10-06 | 34 | 1,780 | 7,605 | $219.7K | 66 % | 99.7M |
| 2026-10-05 | 34 | 1,925 | 8,525 | $359.6K | 71 % | 96.2M |
| 2026-10-04 | 34 | 1,825 | 7,063 | $197.5K | 54 % | 89.7M |
| 2026-10-03 | 34 | 1,518 | 6,041 | $148.7K | 63 % | 88.3M |
Per UTC day, summed over every Midterms, House & Senate 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 Midterms, House & Senate 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 | |
|---|---|---|---|---|---|---|---|
| KXGOVCA-26-XBEC | California Governor's race | Kalshi | 0.976 → 0.975 | Yes | 224 | $195.0K | buy file → |
| KXHOUSERACE-FL25-26-D | House Race Winner? | Kalshi | 0.830 → 0.810 | open | 67 | $67.6K | buy file → |
| KXDSENATESEATS-27-ABOVE52 | Democratic Senate seats | Kalshi | 0.480 → 0.460 | open | 483 | $49.6K | buy file → |
| KXHOUSERACE-MN05-26-D | House Race Winner? | Kalshi | 0.968 → 0.971 | Yes | 119 | $39.4K | buy file → |
| KXDSENATESEATS-27-52 | Democratic Senate seats | Kalshi | 0.140 → 0.210 | open | 454 | $36.0K | buy file → |
| KXHOUSERACE-TX23-26-R | House Race Winner? | Kalshi | 0.540 → 0.550 | open | 280 | $23.9K | buy file → |
| KXMIDTERMMOV-TXSEND-P3 | Midterm margin of victory | Kalshi | 0.460 → 0.470 | open | 284 | $23.1K | buy file → |
| KXGOVCA-26-SHIL | California Governor's race | Kalshi | 0.028 → 0.028 | No | 906 | $20.9K | buy file → |
| will-the-democratic-party-win-the-nc-13-house-seat | 2026 House Election Winners — Democratic party (per district) | Polymarket | 0.420 → 0.440 | open | 101 | $20.5K | buy file → |
| KXGOVAK-26-JKRE | Alaska governor | Kalshi | 0.880 → 0.870 | open | 119 | $19.9K | 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.
Biggest Midterms, House & Senate 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 |
|---|---|---|---|---|
| KXMIDTERMMOV-MISEND-P3 | Kalshi | 0.47 → 0.64 | +0.17 | $35.9K |
| KXMIDTERMMOV-MISEND-P5 | Kalshi | 0.33 → 0.45 | +0.12 | $14.5K |
| will-the-republican-party-win-the-nc-13-house-seat | Polymarket | 0.55 → 0.67 | +0.12 | $22.7K |
| will-the-democratic-party-win-the-ny-17-house-seat | Polymarket | 0.67 → 0.60 | -0.07 | $15.2K |
| KXHOUSERACE-NC13-26-D | Kalshi | 0.43 → 0.36 | -0.07 | $36.4K |
Live contracts ranked by absolute 24-hour price change (contracts quote 0..1; settled or near-settled contracts excluded). Snapshot 2026-11-02 19:21 UTC. Full list in the prediction movers.
Kalshi Midterms, House & Senate series
Largest archive first. Each series page lists its exact coverage, day count and recent days; day bundles are bought in the shop calendar.
Polymarket Midterms, House & Senate 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 | |
|---|---|---|---|---|---|---|---|
| 2026 House Election Margins of Victory — Republican candidates | Polymarket | annual | 90 | August 2026 – present | 68.6 GB | €1 | Buy days |
| 2026 House Election Margins of Victory — Democratic candidates | Polymarket | annual | 90 | August 2026 – present | 60.4 GB | €1 | Buy days |
| 2026 House Election Winners — Republican party (per district) | Polymarket | annual | 342 | November 2025 – present | 56.8 GB | €1 | Buy days |
| 2026 House Election Winners — Democratic party (per district) | Polymarket | annual | 342 | November 2025 – present | 56.4 GB | €1 | Buy days |
Midterms, House & Senate — market types across 43 series
16,957 contracts listed as of 2026-11-02, read from each contract's venue identifier — Kalshi lists each type as its own series, Polymarket, predict.fun and OG.com one family per league.
| Market type | Contracts listed (all time) | Listed last 30 days | Share |
|---|---|---|---|
| moneyline / winner | 724 | 0 | 4 % |
| strike ladder | 26 | 0 | 0 % |
| player & team props | 13 | — | 0 % |
| other | 16,194 | 144 | 96 % |
| Total | 16,957 | 144 | 100 % |
Midterms, House & Senate 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.
Why buy Midterms, House & Senate 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
Midterms, House & Senate prediction-market data — FAQ
Does Kalshi have House race markets?
Yes — House Race Winner (KXHOUSERACE) markets per district, midterm margin-of-victory and voter-turnout series, state ballot measures, political fundraising and NYC statistics.
How is election 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 Midterms, House & Senate data go?
Coverage runs November 2025 – present — 8,459 series-days across 43 series on Kalshi & Polymarket. Each series page lists its exact span.
Can I get Midterms, House & Senate 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 and Polymarket record 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 Midterms, House & Senate 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 Midterms, House & Senate 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 Midterms, House & Senate 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.
Which market types are in the Midterms, House & Senate data?
As of 2026-11-02 the 43 Midterms, House & Senate series with a market-type snapshot had listed 16,957 contracts: moneyline / winner 724 · strike ladder 26 · player & team props 13 · other 16,194 — counted from every contract file of each family across Kalshi, Polymarket. Kalshi splits these into separate series; Polymarket, predict.fun and OG.com list one family per league. Each series page shows its own mix.
What was the busiest Midterms, House & Senate trading day?
2026-08-12 — $5.1M of USD turnover over 35,697 trades in a single series-day. Since our statistics began on 2026-07-08, 40 Midterms, House & Senate series recorded 943,085 trades and $43.5M in total; the biggest single contract was KXGOVFLNOMR-26-BD on 2026-08-18 at $4.0M. Fridays are the busiest weekday at about $914.0K per day.