Tick-by-tick trades and L2 order-book depth for 35 MLS & US Soccer series on Kalshi & Polymarket — MLS games, spreads, totals and correct scores, Leagues Cup, USL Championship, NWSL. 3,090 series-days covering May 2025 – September 2026; 4.3M trades · $161.4M turnover in the 30 days to 2026-09-02. Sold as day bundles from €1.
MLS, Leagues Cup, USL Championship and NWSL markets.
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.
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 | Leagues Cup Game | Kalshi | 1,609,560 | $58.3M | 27 | Buy days |
| 2 | Major League Soccer Game | Kalshi | 930,322 | $33.9M | 28 | Buy days |
| 3 | MLS Soccer | Polymarket | 169,504 | $15.7M | 30 | Buy days |
| 4 | Leagues Cup | Polymarket | 202,463 | $15.2M | 30 | Buy days |
| 5 | Point Total (KXLEAGUESCUPTOTAL) | Kalshi | 401,766 | $12.8M | 24 | Buy days |
| 6 | MLS Total | Kalshi | 233,891 | $10.8M | 26 | Buy days |
| 7 | Spread (KXLEAGUESCUPSPREAD) | Kalshi | 136,031 | $2.5M | 24 | Buy days |
| 8 | 1st Half Total (KXLEAGUESCUP1HTOTAL) | Kalshi | 91,710 | $2.4M | 16 | Buy days |
| 9 | 1st Half Winner (KXLEAGUESCUP1H) | Kalshi | 95,115 | $1.8M | 16 | Buy days |
| 10 | 1st Half Total (KXMLS1HTOTAL) | Kalshi | 43,105 | $1.4M | 18 | Buy days |
Trades and USD turnover summed over every contract of the series, from the recorded tick data; 30 days to 2026-09-02. Series without statistics in the window are omitted.
| Venue | Series | With stats | Trades (30d) | Turnover (30d) |
|---|---|---|---|---|
| Kalshi | 31 | 16 | 3,915,552 | $129.6M |
| Polymarket | 4 | 4 | 409,394 | $31.7M |
30 days to 2026-09-02, from our own daily statistics per contract.
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 | |
|---|---|---|---|---|---|---|---|
| Major League Soccer Game | Kalshi | event | 141 | February 2026 – September 2026 | 3.67 GB | €1 | Buy days |
| USL Championship Game | Kalshi | event | 164 | March 2026 – September 2026 | 2.15 GB | €1 | Buy days |
| MLS Total | Kalshi | event | 132 | March 2026 – September 2026 | 1.98 GB | €1 | Buy days |
| NWSL Game | Kalshi | event | 125 | March 2026 – September 2026 | 1.62 GB | €1 | Buy days |
| Leagues Cup Game | Kalshi | event | 35 | July 2026 – September 2026 | 1.26 GB | €1 | Buy days |
| MLS Spread | Kalshi | event | 132 | March 2026 – September 2026 | 838 MB | €1 | Buy days |
| MLS Cup champion | Kalshi | event | 183 | March 2026 – September 2026 | 685 MB | €1 | Buy days |
| Point Total (KXLEAGUESCUPTOTAL) | Kalshi | event | 32 | July 2026 – September 2026 | 574 MB | €1 | Buy days |
| Correct Score (KXMLSSCORE) | Kalshi | event | 39 | July 2026 – September 2026 | 521 MB | €1 | Buy days |
| Correct Score (KXLEAGUESCUPSCORE) | Kalshi | event | 23 | July 2026 – September 2026 | 406 MB | €1 | Buy days |
| Point Total (KXUSLTOTAL) | Kalshi | event | 49 | July 2026 – September 2026 | 384 MB | €1 | Buy days |
| MLS BTTS | Kalshi | event | 132 | March 2026 – September 2026 | 375 MB | €1 | Buy days |
| Team Total (KXLEAGUESCUPTEAMTOTAL) | Kalshi | event | 23 | July 2026 – September 2026 | 365 MB | €1 | Buy days |
| Spread (KXLEAGUESCUPSPREAD) | Kalshi | event | 32 | July 2026 – September 2026 | 330 MB | €1 | Buy days |
| Team Total (KXMLSTEAMTOTAL) | Kalshi | event | 37 | July 2026 – August 2026 | 290 MB | €1 | Buy days |
| Canadian Premier League | Kalshi | event | 116 | April 2026 – September 2026 | 242 MB | €1 | Buy days |
| Spread (KXUSLSPREAD) | Kalshi | event | 49 | July 2026 – September 2026 | 225 MB | €1 | Buy days |
| 1st Half Winner (KXMLS1H) | Kalshi | event | 37 | July 2026 – August 2026 | 218 MB | €1 | Buy days |
| 1st Half Total (KXMLS1HTOTAL) | Kalshi | event | 37 | July 2026 – August 2026 | 213 MB | €1 | Buy days |
| 1st Half Winner (KXLEAGUESCUP1H) | Kalshi | event | 23 | July 2026 – September 2026 | 172 MB | €1 | Buy days |
| 1st Half Total (KXLEAGUESCUP1HTOTAL) | Kalshi | event | 23 | July 2026 – September 2026 | 154 MB | €1 | Buy days |
| College Soccer Game | Kalshi | event | 15 | August 2026 – September 2026 | 132 MB | €1 | Buy days |
| USL Cup Game | Kalshi | event | 47 | May 2026 – September 2026 | 91.4 MB | €1 | Buy days |
| MLS Western Conference winner? (KXMLSEAST) | Kalshi | annual | 183 | March 2026 – September 2026 | 90.1 MB | €1 | Buy days |
| First Team to Score (KXLEAGUESCUPFTTS) | Kalshi | event | 23 | July 2026 – September 2026 | 80.4 MB | €1 | Buy days |
| First Team to Score | Kalshi | event | 37 | July 2026 – September 2026 | 62.1 MB | €1 | Buy days |
| MLS Western Conference winner? (KXMLSWEST) | Kalshi | annual | 183 | March 2026 – September 2026 | 54.0 MB | €1 | Buy days |
| MLS Transfers | Kalshi | event | 140 | April 2026 – September 2026 | 20.5 MB | €1 | Buy days |
| USL Championship | Kalshi | event | 175 | March 2026 – September 2026 | 11.6 MB | €1 | Buy days |
| NWSL Champion | Kalshi | annual | 116 | May 2026 – September 2026 | 10.8 MB | €1 | Buy days |
| 1st Half Correct Score (KXMLS1HSCORE) | Kalshi | event | 6 | August 2026 – September 2026 | 10.6 MB | €1 | Buy days |
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 | |
|---|---|---|---|---|---|---|---|
| MLS Soccer | Polymarket | event | 366 | July 2025 – September 2026 | 38.5 GB | €1 | Buy days |
| NWSL Soccer | Polymarket | event | 143 | March 2026 – September 2026 | 12.2 GB | €1 | Buy days |
| Leagues Cup | Polymarket | event | 50 | May 2025 – September 2026 | 7.30 GB | €1 | Buy days |
| USL Championship | Polymarket | event | 42 | July 2026 – September 2026 | 2.77 GB | €1 | Buy days |
Yes — MLS games, spreads, totals, team totals, first-half lines and correct scores, plus Leagues Cup games, spreads, totals and first team to score, and USL totals. Polymarket MLS, Leagues Cup, USL Championship and NWSL each form a family.
One purchase covers every contract of a series for one UTC day — tick-by-tick trades plus Level-2 order-book updates per contract — typically €1 per series-day.
Coverage runs May 2025 – September 2026 — 3,090 series-days across 35 series on Kalshi & Polymarket. Each series page lists its exact span.
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. Both venues 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.
Typically €1 per series-day bundle — every contract of the series for that UTC day, with invoice on checkout. Pick days in the shop calendar.