Kalshi Pro Basketball First Opponent of the S
Every Kalshi “Pro Basketball First Opponent of the Season” contract of the day — every trade print and the complete Level-2 book, captured co-located with nanosecond venue and receive timestamps. 19 trading days as day bundles, €1 per day, bought as a guest with instant download.
Pro Basketball First Opponent of the Season 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 Pro Basketball First Opponent of the Season contract that was listed on Kalshi on that UTC day — traded or not — 145 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 – present — 19 trading days, 26.9 MB compressed in total. A day typically holds 145 contract files (up to 145 on the busiest day, 7.14 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.
Pro Basketball First Opponent of the Season — development since capture
425 trades and $15.3K of USD turnover over 19 captured days since 2026-07-24 — record day 2026-08-11 with $8.0K, biggest single contract KXNBAFIRSTOPPONENT-26PHI-NYK (NBAFIRSTOPPONENT · NYK) (2026-08-11, $4.0K).
| Month | Days | Trades | Turnover (USD) | Avg / day | Contracts traded | L2 updates | vs previous month |
|---|---|---|---|---|---|---|---|
| Aug 2026 | 11 | 277 | $12.4K | $1.1K | 33 | 226.2K | +312.1 % |
| Jul 2026 | 8 | 148 | $3.0K | $374.63 | — | — | — |
Kalshi Pro Basketball First Opponent of the Season — 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.
NBA markets on other prediction venues
Polymarket, predict.fun, OG.com also list NBA 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 · Pro Basketball First Opponent of the Season (this page) | — | — | — | — | — | 19 | €1 |
| Polymarket · NBA (games & props) | 1,091,143 | $207.8M | 2.56 ¢ | $39.6K | 1214.7 | 548 | €1 |
| predict.fun · NBA (games & props) | 166,293 | $9.9M | 2.32 ¢ | $23.0K | 1145.3 | 27 | €1 |
| OG.com · NBA (games & props) | 116,926 | $9.6M | 2.85 ¢ | $29.5K | 682.6 | 30 | €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.
Pro Basketball First Opponent of the Season — last 19 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-08-11 | 145 | 4.39 MB | 16 | 111 | $8.0K | 93 % | 14.8 ¢ | $410.09 | 171.2K | Buy day → | |
| 2026-08-10 | 145 | 1.43 MB | 10 | 52 | $1.8K | 86 % | 5.98 ¢ | $22.97 | 38.8K | Buy day → | |
| 2026-08-09 | 145 | 862 KB | 7 | 17 | $401.28 | 67 % | 7.76 ¢ | $23.74 | 16.2K | Buy day → | |
| 2026-08-08 | 145 | 836 KB | — | 5 | $96.75 | — | — | — | — | Buy day → | |
| 2026-08-07 | 145 | 906 KB | — | 33 | $1.1K | — | — | — | — | Buy day → | |
| 2026-08-06 | 145 | 900 KB | — | 2 | $19.16 | — | — | — | — | Buy day → | |
| 2026-08-05 | 145 | 816 KB | — | 31 | $369.69 | — | — | — | — | Buy day → | |
| 2026-08-04 | 145 | 829 KB | — | 3 | $45.6 | — | — | — | — | Buy day → | |
| 2026-08-03 | 145 | 901 KB | — | 16 | $471.68 | — | — | — | — | Buy day → | |
| 2026-08-02 | 145 | 757 KB | — | 0 | $0 | — | — | — | — | Buy day → | |
| 2026-08-01 | 145 | 749 KB | — | 7 | $58.93 | — | — | — | — | Buy day → | |
| 2026-07-31 | 145 | 848 KB | — | 12 | $101.13 | — | — | — | — | Buy day → | |
| 2026-07-30 | 145 | 662 KB | — | 6 | $77.13 | — | — | — | — | Buy day → | |
| 2026-07-29 | 145 | 756 KB | — | 3 | $30.02 | — | — | — | — | Buy day → | |
| 2026-07-28 | 145 | 811 KB | — | 22 | $258.39 | — | — | — | — | Buy day → | |
| 2026-07-27 | 145 | 1.83 MB | — | 26 | $246.33 | — | — | — | — | Buy day → | |
| 2026-07-26 | 145 | 7.14 MB | — | 9 | $54.76 | — | — | — | — | Buy day → | |
| 2026-07-25 | 145 | 1.24 MB | — | 34 | $905.21 | — | — | — | — | Buy day → | |
| 2026-07-24 | 145 | 534 KB | — | 36 | $1.3K | — | — | — | — | 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 Pro Basketball First Opponent of the Season 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 Pro Basketball First Opponent of the Season contracts on 2026-08-11 — 4 closed Yes (≥ 0.97), 0 closed No (≤ 0.03), 6 still open at the last print: 101 trades, $8.0K USD turnover. The busiest contract was KXNBAFIRSTOPPONENT-26PHI-NYK with $4.0K turnover.
| Contract | Settles (UTC) | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXNBAFIRSTOPPONENT-26PHI-NYK NBAFIRSTOPPONENT · NYK | 2026-08-11 14:20 | 0.630 | 0.990 | 0.630 | 0.990 | 0.988 | Yes | 10 | $4.0K | 100 % | 15.6 ¢ | $270.31 | 751 | buy file → |
| KXNBAFIRSTOPPONENT-26NYK-PHI NBAFIRSTOPPONENT · PHI | 2026-08-11 14:20 | 0.650 | 0.990 | 0.630 | 0.910 | 0.962 | open | 23 | $2.5K | 99 % | 14.7 ¢ | $660.89 | 9.7K | buy file → |
| KXNBAFIRSTOPPONENT-26BOS-DET NBAFIRSTOPPONENT · DET | 2026-08-11 14:20 | 0.740 | 0.990 | 0.460 | 0.980 | 0.897 | Yes | 31 | $1.1K | 52 % | 12.5 ¢ | $343.8 | 3.8K | buy file → |
| KXNBAFIRSTOPPONENT-26SAS-OKC NBAFIRSTOPPONENT · OKC | 2026-08-11 14:20 | 0.680 | 0.990 | 0.680 | 0.990 | 0.971 | Yes | 4 | $145.65 | 100 % | 14.6 ¢ | $456.17 | 386 | buy file → |
| KXNBAFIRSTOPPONENT-26OKC-SAS NBAFIRSTOPPONENT · SAS | 2026-08-11 14:20 | 0.630 | 0.990 | 0.630 | 0.990 | 0.933 | Yes | 9 | $110.6 | 100 % | 15.3 ¢ | $533.78 | 569 | buy file → |
| KXNBAFIRSTOPPONENT-26OKC-LAL NBAFIRSTOPPONENT · LAL | 2026-08-11 14:20 | 0.780 | 0.780 | 0.110 | 0.110 | 0.132 | open | 8 | $19.36 | 91 % | 19.0 ¢ | $7.75 | 2.1K | buy file → |
| KXNBAFIRSTOPPONENT-26NYK-BOS NBAFIRSTOPPONENT · BOS | 2026-08-11 14:20 | 0.190 | 0.210 | 0.160 | 0.210 | 0.191 | open | 6 | $18.6 | 66 % | 15.6 ¢ | $28.63 | 80.4K | buy file → |
| KXNBAFIRSTOPPONENT-26NYK-CLE NBAFIRSTOPPONENT · CLE | 2026-08-11 14:20 | 0.080 | 0.080 | 0.040 | 0.060 | 0.059 | open | 2 | $9.2 | 98 % | 2.00 ¢ | $19.6 | 98 | buy file → |
| KXNBAFIRSTOPPONENT-26PHI-LAL NBAFIRSTOPPONENT · LAL | 2026-08-11 14:20 | 0.170 | 0.190 | 0.150 | 0.150 | 0.172 | open | 5 | $7.03 | 67 % | 14.1 ¢ | $4.73 | 68.2K | buy file → |
| KXNBAFIRSTOPPONENT-26SAS-MIN NBAFIRSTOPPONENT · MIN | 2026-08-11 14:20 | 0.150 | 0.150 | 0.050 | 0.050 | 0.118 | open | 3 | $5.22 | 90 % | 40.2 ¢ | $26.75 | 64 | 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).
2026-08-10 — 10 contracts, 52 trades, $1.8K turnover
The 10 most traded Pro Basketball First Opponent of the Season contracts on 2026-08-10 — 0 closed Yes (≥ 0.97), 1 closed No (≤ 0.03), 9 still open at the last print: 52 trades, $1.8K USD turnover. The busiest contract was KXNBAFIRSTOPPONENT-26BOS-DET with $1.3K turnover.
| Contract | Settles (UTC) | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXNBAFIRSTOPPONENT-26BOS-DET NBAFIRSTOPPONENT · DET | 2026-08-11 14:20 | 0.760 | 0.950 | 0.630 | 0.740 | 0.761 | open | 20 | $1.3K | 79 % | 4.94 ¢ | $20.66 | 4.1K | buy file → |
| KXNBAFIRSTOPPONENT-26NYK-PHI NBAFIRSTOPPONENT · PHI | 2026-08-11 14:20 | 0.500 | 0.650 | 0.500 | 0.650 | 0.619 | open | 10 | $204.56 | 100 % | 9.51 ¢ | $24.99 | 4.2K | buy file → |
| KXNBAFIRSTOPPONENT-26OKC-SAS NBAFIRSTOPPONENT · SAS | 2026-08-11 14:20 | 0.550 | 0.630 | 0.550 | 0.630 | 0.614 | open | 4 | $194.75 | 100 % | 8.37 ¢ | $42.8 | 7.8K | buy file → |
| KXNBAFIRSTOPPONENT-26SAS-OKC NBAFIRSTOPPONENT · OKC | 2026-08-11 14:20 | 0.610 | 0.690 | 0.610 | 0.680 | 0.665 | open | 4 | $119.69 | 100 % | 6.32 ¢ | $17.01 | 7.2K | buy file → |
| KXNBAFIRSTOPPONENT-26PHI-NYK NBAFIRSTOPPONENT · NYK | 2026-08-11 14:20 | 0.700 | 0.870 | 0.560 | 0.630 | 0.599 | open | 6 | $32.11 | 100 % | 8.76 ¢ | $16.23 | 172 | buy file → |
| KXNBAFIRSTOPPONENT-26PHI-LAL NBAFIRSTOPPONENT · LAL | 2026-08-11 14:20 | 0.860 | 0.860 | 0.170 | 0.170 | 0.170 | open | 1 | $17 | 100 % | 3.96 ¢ | $5.65 | 436 | buy file → |
| KXNBAFIRSTOPPONENT-26NYK-SAS NBAFIRSTOPPONENT · SAS | 2026-08-11 14:20 | 0.580 | 0.580 | 0.100 | 0.100 | 0.100 | open | 2 | $4.71 | 100 % | 9.00 ¢ | $4.5 | 107 | buy file → |
| KXNBAFIRSTOPPONENT-26BOS-MIA NBAFIRSTOPPONENT · MIA | 2026-08-11 14:20 | 0.210 | 0.210 | 0.110 | 0.110 | 0.110 | open | 1 | $0.95 | 100 % | 6.61 ¢ | $4.2 | 171 | buy file → |
| KXNBAFIRSTOPPONENT-26SAS-LAL NBAFIRSTOPPONENT · LAL | 2026-08-11 14:20 | 0.130 | 0.130 | 0.100 | 0.100 | 0.100 | open | 2 | $0.94 | 100 % | 8.00 ¢ | $6.01 | 117 | buy file → |
| KXNBAFIRSTOPPONENT-26NYK-MIN NBAFIRSTOPPONENT · MIN | 2026-08-11 14:20 | 0.370 | 0.370 | 0.010 | 0.010 | 0.010 | No | 2 | $0.5 | 0 % | 7.58 ¢ | $0.8 | 129 | buy file → |
2026-08-09 — 7 contracts, 17 trades, $401.28 turnover
The 7 most traded Pro Basketball First Opponent of the Season contracts on 2026-08-09 — 0 closed Yes (≥ 0.97), 0 closed No (≤ 0.03), 7 still open at the last print: 17 trades, $401.28 USD turnover. The busiest contract was KXNBAFIRSTOPPONENT-26BOS-DET with $199.65 turnover.
| Contract | Settles (UTC) | Open | High | Low | Close | VWAP | Implied outcome | Trades | Turnover | Buy share | Spread | Top-1 depth | L2 updates | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| KXNBAFIRSTOPPONENT-26BOS-DET NBAFIRSTOPPONENT · DET | 2026-08-11 14:20 | 0.630 | 0.760 | 0.600 | 0.760 | 0.619 | open | 6 | $199.65 | 100 % | 6.15 ¢ | $27.78 | 705 | buy file → |
| KXNBAFIRSTOPPONENT-26NYK-PHI NBAFIRSTOPPONENT · PHI | 2026-08-11 14:20 | 0.680 | 0.680 | 0.500 | 0.500 | 0.501 | open | 3 | $130.33 | 0 % | 9.82 ¢ | $26.34 | 729 | buy file → |
| KXNBAFIRSTOPPONENT-26BOS-NYK NBAFIRSTOPPONENT · NYK | 2026-08-11 14:20 | 0.220 | 0.220 | 0.130 | 0.130 | 0.130 | open | 1 | $32.5 | 100 % | 8.55 ¢ | $10.39 | 534 | buy file → |
| KXNBAFIRSTOPPONENT-26PHI-LAL NBAFIRSTOPPONENT · LAL | 2026-08-11 14:20 | 0.030 | 0.860 | 0.030 | 0.860 | 0.169 | open | 4 | $17.12 | 100 % | 8.80 ¢ | $2.39 | 586 | buy file → |
| KXNBAFIRSTOPPONENT-26PHI-MIA NBAFIRSTOPPONENT · MIA | 2026-08-11 14:20 | 0.060 | 0.060 | 0.060 | 0.060 | 0.060 | open | 1 | $15 | 100 % | 8.34 ¢ | $2.76 | 170 | buy file → |
| KXNBAFIRSTOPPONENT-26NYK-MIA NBAFIRSTOPPONENT · MIA | 2026-08-11 14:20 | 0.190 | 0.190 | 0.060 | 0.060 | 0.060 | open | 1 | $4.5 | 100 % | — | — | 132 | buy file → |
| KXNBAFIRSTOPPONENT-26PHI-BOS NBAFIRSTOPPONENT · BOS | 2026-08-11 14:20 | 0.130 | 0.130 | 0.110 | 0.110 | 0.110 | open | 1 | $2.18 | 0 % | 9.26 ¢ | $9.51 | 92 | buy file → |
NBA on Kalshi — market types across the series
Across 92 NBA series on Kalshi, 188,552 contracts have been listed as of 2026-11-05: player & team props 70,120 · total / over-under 37,059 · spread / handicap 24,535 · period markets 2,532 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 | 70,120 | 25,542 | 37 % |
| total / over-under | 37,059 | 18,183 | 20 % |
| spread / handicap | 24,535 | 11,182 | 13 % |
| period markets | 2,532 | 0 | 1 % |
| moneyline / winner | 1,572 | 370 | 1 % |
| strike ladder | 270 | 0 | 0 % |
| other | 52,464 | 32,070 | 28 % |
| Total | 188,552 | 87,347 | 100 % |
Kalshi NBA 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 2026-11-05; “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 Pro Basketball First Opponent of the Season contract trades
On Kalshi, a Pro Basketball First Opponent of the Season contract trades for about 18 days from open to close, and quotes in 1 ¢ price steps (0..1). Measured on the 10 contracts captured on 2026-08-11.
Build a Pro Basketball First Opponent of the Season model on this data
Every settled Pro Basketball First Opponent of the Season 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 Pro Basketball First Opponent of the Season 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 free full-day samples from the major venues let you test 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 Pro Basketball First Opponent of the Season data — FAQ
What Kalshi Pro Basketball First Opponent of the Season data can I download?
Tick-by-tick trades and Level-2 order-book depth for every contract of the Pro Basketball First Opponent of the Season series on Kalshi (145 contract files on the latest day). One bundle = one UTC day of the whole series.
What is the Kalshi series ticker for Pro Basketball First Opponent of the Season?
KXNBAFIRSTOPPONENT — 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 KXNBAFIRSTOPPONENT-* contract listed that UTC day.
How far back does the Pro Basketball First Opponent of the Season data go?
Coverage runs July 2026 – present — 19 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 Pro Basketball First Opponent of the Season 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 Pro Basketball First Opponent of the Season 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 Pro Basketball First Opponent of the Season 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 Pro Basketball First Opponent of the Season 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 Pro Basketball First Opponent of the Season contract on 2026-08-11?
KXNBAFIRSTOPPONENT-26PHI-NYK (NBAFIRSTOPPONENT · NYK) — $4.0K USD turnover over 10 trades on Kalshi. The 10 most traded contracts of the series did 101 trades and $8.0K 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 Pro Basketball First Opponent of the Season trading day on Kalshi?
2026-08-11, with $8.0K of USD turnover over 111 trades across every Pro Basketball First Opponent of the Season contract of the day; the busiest full month was Aug 2026 at $12.4K. Since our statistics began on 2026-07-24 the series has recorded 425 trades and $15.3K over 19 captured days; the single biggest contract was KXNBAFIRSTOPPONENT-26PHI-NYK (NBAFIRSTOPPONENT · NYK) on 2026-08-11 with $4.0K. Any of these days is a downloadable bundle.
Which market types does Kalshi list for NBA?
Kalshi lists each market type as its own series — 92 NBA series with 188,552 contracts listed as of 2026-11-05: player & team props 70,120 · total / over-under 37,059 · spread / handicap 24,535 · period markets 2,532 · moneyline / winner 1,572. Pro Basketball First Opponent of the Season 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.