Runs daily · last run ended on October 16
Odds arbitrage scanner
Do sportsbooks and prediction markets ever disagree enough that backing both sides locks in a profit? I built a system to watch 7 venues in real time and find out.
- of live streaming
- verified price updates
- cross-venue pairs priced
- pairs that crossed break-even
The question
A sportsbook and an exchange price the same event independently. If DraftKings pays +229 on a pitcher going over 7.5 strikeouts while Kalshi sells the under for 68¢, buying both costs less than the dollar one of them must pay out. The catch is that these gaps are small, brief, and easy to fake with bad data, so the system has to be fast and suspicious at the same time.
Sportsbooks: DraftKings, FanDuel, Caesars, BetMGM, DK Predictions. Exchanges: Kalshi and Polymarket. Game lines in 14 leagues, plus periods, team totals and player props.
How it works
(01)
Watch
Each sportsbook page stays open in a real browser, so the site pushes its own price updates to me.
(02)
Verify
Every 15 seconds each price is checked against what the page actually renders. Anything unconfirmed is dropped.
(03)
Stream
Kalshi and Polymarket prices arrive live, from Polymarket's WebSocket and fast Kalshi polling.
(04)
Match & price
Markets are matched across venues by game, player, stat and line; only changed games are re-priced, after each venue's fees.
(05)
Alert & record
A positive edge with every leg fresh raises an alert. Every price and every near miss lands in DuckDB.
How close it gets
Every way to cover a market across two venues, and the best edge it ever reached while being watched. Almost all of them sit a few cents below break-even: the typical pair costs 2.6¢ more than it pays back.
Show as a table
| Best edge | Pairs |
|---|---|
| below -9.5¢ | 69 |
| -9.5¢ to -9¢ | 12 |
| -8.5¢ to -8¢ | 7 |
| -8¢ to -7.5¢ | 6 |
| -7.5¢ to -7¢ | 14 |
| -7¢ to -6.5¢ | 5 |
| -6.5¢ to -6¢ | 26 |
| -6¢ to -5.5¢ | 15 |
| -5.5¢ to -5¢ | 57 |
| -5¢ to -4.5¢ | 54 |
| -4.5¢ to -4¢ | 70 |
| -4¢ to -3.5¢ | 79 |
| -3.5¢ to -3¢ | 107 |
| -3¢ to -2.5¢ | 115 |
| -2.5¢ to -2¢ | 139 |
| -2¢ to -1.5¢ | 101 |
| -1.5¢ to -1¢ | 64 |
| -1¢ to -0.5¢ | 39 |
| -0.5¢ to 0¢ | 61 |
| 0¢ to 0.5¢ | 38 |
| 0.5¢ to 1¢ | 14 |
MLB
62 pairs · 1 arbitrage · best +0.83¢
NFL
1,045 pairs · 136 arbitrages · best +80.75¢
NHL
143 pairs · 1 arbitrage · best +0.01¢
What it found
138 pairs crossed break-even, the best by 80.75¢ per dollar. All but one carried a settlement risk (the exception was a single contract), and the most any of them could have made was about a dollar, so none was worth placing. These markets are efficient, and now I can show it rather than assume it.
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+24.59¢ per $1
- Kalshi · Over 24.547¢
- Polymarket · Under 24.545.6¢
Open 1.8 h · 356 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+16.68¢ per $1
- Kalshi · Seattle Seahawks +6.539¢
- Polymarket · Denver Broncos -6.554¢
Open 2.6 h · 6,264 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+16.61¢ per $1
- Kalshi · Seattle Seahawks +3.563¢
- Polymarket · Denver Broncos -3.530¢
Open 86 min · 1,541 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+14.73¢ per $1
- Kalshi · Seattle Seahawks +7.583¢
- Polymarket · Denver Broncos -7.512¢
Open 2.0 h · 6,904 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+13.71¢ per $1
- Kalshi · Seattle Seahawks +7.558¢
- Polymarket · Denver Broncos -6.535¢
Open 8 min · 436 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+13.64¢ per $1
- Kalshi · Seattle Seahawks +4.538¢
- Polymarket · Denver Broncos -4.556¢
Open 1.6 h · 3,250 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+13.60¢ per $1
- Kalshi · Seattle Seahawks +5.536¢
- Polymarket · Denver Broncos -5.557¢
Open 1.6 h · 6,464 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+12.54¢ per $1
- Polymarket · Seattle Seahawks +6.542¢
- Kalshi · Denver Broncos -6.551¢
Open 2.5 h · 6,469 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+11.62¢ per $1
- Kalshi · Seattle Seahawks +4.540¢
- Polymarket · Denver Broncos -3.553¢
Open 56 min · 1,573 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+11.59¢ per $1
- Kalshi · Over 21.562¢
- Polymarket · Under 22.530.9¢
Open 3 min · 5 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+11.54¢ per $1
- Kalshi · Over 30.522¢
- Polymarket · Under 30.572¢
Open 2.1 h · 2,170 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+10.82¢ per $1
- Polymarket · Seattle Seahawks +9.560¢
- Kalshi · Denver Broncos -9.533¢
Open 1.6 h · 7,981 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+10.61¢ per $1
- Kalshi · Seattle Seahawks +6.539¢
- Polymarket · Denver Broncos -5.555¢
Open 21 min · 901 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+8.63¢ per $1
- Polymarket · Seattle Seahawks +3.528¢
- Kalshi · Denver Broncos -3.565¢
Open 2.6 h · 2,918 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+8.55¢ per $1
- Polymarket · Seattle Seahawks +5.539¢
- Kalshi · Denver Broncos -5.554¢
Open 2.5 h · 6,150 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+8.52¢ per $1
- Polymarket · Seattle Seahawks +7.559¢
- Kalshi · Denver Broncos -7.534¢
Open 1.9 h · 7,130 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+8.25¢ per $1
- Kalshi · Seattle Seahawks +10.568¢
- Polymarket · Denver Broncos -10.525¢
Open 86 min · 1,500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+7.96¢ per $1
- Polymarket · Seattle Seahawks +1.527¢
- Kalshi · Denver Broncos -1.567¢
Open 2.3 h · 2,029 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+7.84¢ per $1
- Polymarket · Seattle Seahawks +10.564¢
- Kalshi · Denver Broncos -10.529¢
Open 1.9 h · 5,316 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+7.84¢ per $1
- Polymarket · Seattle Seahawks +10.565¢
- Kalshi · Denver Broncos -9.529¢
Open 1.5 h · 327 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+7.75¢ per $1
- Kalshi · Cooper Kupp Over 24.5 receiving yards62¢
- Polymarket · Cooper Kupp Under 24.5 receiving yards34¢
Open 1 min · 17 contracts available · Risk: legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+7.71¢ per $1
- Polymarket · Seattle Seahawks +4.533¢
- Kalshi · Denver Broncos -4.560¢
Open 2.5 h · 7,485 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+7.65¢ per $1
- Kalshi · Seattle Seahawks +13.579¢
- Polymarket · Denver Broncos -13.515¢
Open 2.6 h · 649 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+7.64¢ per $1
- Kalshi · Seattle Seahawks +7.546¢
- Polymarket · Denver Broncos -5.548¢
Open 2 min · 518 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+7.52¢ per $1
- Polymarket · Seattle Seahawks +7.553¢
- Kalshi · Denver Broncos -6.544¢
Open 58 min · 365 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+6.82¢ per $1
- Polymarket · Seattle Seahawks +2.525¢
- Kalshi · Denver Broncos -2.568¢
Open 2.6 h · 3,799 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+6.68¢ per $1
- Polymarket · Over 30.533¢
- Kalshi · Under 30.560¢
Open 2.5 h · 7,596 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+6.60¢ per $1
- Kalshi · Over 27.529¢
- Polymarket · Under 28.565¢
Open 2.6 h · 500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+6.52¢ per $1
- Polymarket · Seattle Seahawks +6.544¢
- Kalshi · Denver Broncos -5.550¢
Open 1.6 h · 3,482 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+6.21¢ per $1
- Kalshi · Seattle Seahawks +9.566¢
- Polymarket · Denver Broncos -9.527¢
Open 58 min · 3,699 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+6.21¢ per $1
- Kalshi · Seattle Seahawks +10.574¢
- Polymarket · Denver Broncos -9.520¢
Open 55 min · 2,117 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+6.08¢ per $1
- Kalshi · Seattle Seahawks -3.57¢
- Polymarket · Denver Broncos +3.588¢
Open 2.3 h · 500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+5.95¢ per $1
- Polymarket · Over 24.576.2¢
- Kalshi · Under 24.520¢
Open 2.6 h · 4,075 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+5.64¢ per $1
- Kalshi · George Holani Over 1.5 touchdowns2¢
- Polymarket · George Holani Under 1.5 touchdowns96¢
Open 1 min · 35 contracts available · Risk: legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+5.52¢ per $1
- Kalshi · Over 36.551¢
- Polymarket · Under 36.542¢
Open 2.1 h · 3,413 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+5.23¢ per $1
- Polymarket · Seattle Seahawks +14.573¢
- Kalshi · Denver Broncos -14.521¢
Open 89 min · 244 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+5.08¢ per $1
- Polymarket · Seattle Seahawks +13.573¢
- Kalshi · Denver Broncos -13.521¢
Open 1.6 h · 9,036 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+4.69¢ per $1
- Kalshi · Seattle Seahawks +2.534¢
- Polymarket · Denver Broncos -2.559¢
Open 2.6 h · 4,261 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+4.69¢ per $1
- Kalshi · Cooper Kupp Over 39.5 receiving yards34¢
- Polymarket · Cooper Kupp Under 39.5 receiving yards59¢
Open 1 min · 5 contracts available · Risk: legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+4.61¢ per $1
- Polymarket · Seattle Seahawks +9.555¢
- Kalshi · Denver Broncos -7.538¢
Open 1 min · 889 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+4.59¢ per $1
- Polymarket · Over 44.536¢
- Kalshi · Under 44.557¢
Open 1.9 h · 500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+4.52¢ per $1
- Polymarket · Seattle Seahawks +7.541¢
- Kalshi · Denver Broncos -5.552¢
Open 1 min · 667 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+4.51¢ per $1
- Polymarket · Over 42.547¢
- Kalshi · Under 42.546¢
Open 2.6 h · 658 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+4.48¢ per $1
- Polymarket · Seattle Seahawks +16.577¢
- Kalshi · Denver Broncos -16.517¢
Open 88 min · 249 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+4.14¢ per $1
- Polymarket · Jaxon Smith Njigba Over 1.5 touchdowns6¢
- Kalshi · Jaxon Smith Njigba Under 1.5 touchdowns89¢
Open 16 min · 15,300 contracts available · Risk: legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+3.91¢ per $1
- Kalshi · Seattle Seahawks +1.528¢
- Polymarket · Denver Broncos -1.566¢
Open 2.6 h · 598 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+3.89¢ per $1
- Polymarket · Seattle Seahawks +2.526¢
- Kalshi · Denver Broncos -1.568¢
Open 1 min · 1,175 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+3.78¢ per $1
- Polymarket · Seattle Seahawks +4.529¢
- Kalshi · Denver Broncos -3.565¢
Open 77 min · 8,580 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+3.70¢ per $1
- Polymarket · Seattle Seahawks -0.532¢
- Kalshi · Denver Broncos +1.562¢
Open 1 min · 5 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+3.62¢ per $1
- Kalshi · Seattle Seahawks +16.582¢
- Polymarket · Denver Broncos -16.513¢
Open 85 min · 500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+3.51¢ per $1
- Polymarket · Over 36.548¢
- Kalshi · Under 36.546¢
Open 2.6 h · 2,400 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+3.51¢ per $1
- Kalshi · Rashid Shaheed Over 19.5 receiving yards49¢
- Polymarket · Rashid Shaheed Under 19.5 receiving yards45¢
Open 1 min · 161 contracts available · Risk: legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+3.26¢ per $1
- Polymarket · Seattle Seahawks -1.519¢
- Kalshi · Denver Broncos +1.576¢
Open 1.7 h · 4,323 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+3.20¢ per $1
- Kalshi · Seattle Seahawks -1.522¢
- Polymarket · Denver Broncos +1.573¢
Open 86 min · 500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+3.15¢ per $1
- Kalshi · Seattle Seahawks +9.574¢
- Polymarket · Denver Broncos -8.521¢
Open 54 min · 1,247 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+3.15¢ per $1
- Kalshi · Seattle Seahawks +10.574¢
- Polymarket · Denver Broncos -8.521¢
Open 9 min · 2,117 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+3.11¢ per $1
- Kalshi · Seattle Seahawks +14.589¢
- Polymarket · Denver Broncos -14.57¢
Open 56 min · 496 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+2.93¢ per $1
- Kalshi · Seattle Seahawks -14.511¢
- Polymarket · Denver Broncos +14.585¢
Open 1 min · 59 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+2.74¢ per $1
- Kalshi · Over 42.533¢
- Polymarket · Under 42.562¢
Open 1.8 h · 5,199 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+2.67¢ per $1
- Polymarket · Seattle Seahawks -3.513¢
- Kalshi · Denver Broncos +3.583¢
Open 1.9 h · 1,686 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+2.53¢ per $1
- Polymarket · Seattle Seahawks +5.541¢
- Kalshi · Denver Broncos -4.554¢
Open 8 min · 5 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+2.53¢ per $1
- Polymarket · Seattle Seahawks +6.541¢
- Kalshi · Denver Broncos -4.554¢
Open 1 min · 3 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+2.51¢ per $1
- Polymarket · Over 34.549¢
- Kalshi · Under 36.546¢
Open 1 min · 305 contracts available
NFL · Chicago Bears @ Atlanta Falcons · 2026-10-18
+2.51¢ per $1
- Polymarket · Bijan Robinson Over 89.5 rushing yards50¢
- Kalshi · Bijan Robinson Under 89.5 rushing yards45¢
Open 9 min · 7 contracts available · Risk: legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+2.50¢ per $1
- Polymarket · Over 40.546¢
- Kalshi · Under 40.549¢
Open 71 min · 7,228 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+2.39¢ per $1
- Kalshi · Over 44.519¢
- Polymarket · Under 44.577¢
Open 2.1 h · 115 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+2.30¢ per $1
- Polymarket · Over 32.519¢
- Kalshi · Under 33.577¢
Open 2.3 h · 106 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+2.24¢ per $1
- Polymarket · Seattle Seahawks -7.520¢
- Kalshi · Denver Broncos +7.576¢
Open 2.3 h · 2,199 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+2.10¢ per $1
- Kalshi · Seattle Seahawks -4.59¢
- Polymarket · Denver Broncos +4.588¢
Open 2.4 h · 500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+2.10¢ per $1
- Polymarket · Over 60.53.4¢
- Kalshi · Under 60.594¢
Open 26 min · 92 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.83¢ per $1
- Polymarket · Over 44.529¢
- Kalshi · Under 45.567¢
Open 1 min · 500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.80¢ per $1
- Kalshi · Seattle Seahawks -16.513¢
- Polymarket · Denver Broncos +16.584¢
Open 1 min · 351 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.79¢ per $1
- Polymarket · Seattle Seahawks -6.530¢
- Kalshi · Denver Broncos +6.566¢
Open 2.3 h · 500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.78¢ per $1
- Polymarket · Seattle Seahawks -14.512¢
- Kalshi · Denver Broncos +14.585¢
Open 1 min · 4,216 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.63¢ per $1
- Polymarket · Seattle Seahawks -4.536¢
- Kalshi · Denver Broncos +4.560¢
Open 46 min · 1,794 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.60¢ per $1
- Polymarket · Seattle Seahawks -5.537¢
- Kalshi · Denver Broncos +5.559¢
Open 2.2 h · 1,650 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.59¢ per $1
- Polymarket · Seattle Seahawks to win57¢
- Kalshi · Denver Broncos to win39¢
Open 25 min · 42,219 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.59¢ per $1
- Kalshi · Seattle Seahawks +5.539¢
- Polymarket · Denver Broncos -4.557¢
Open 1 min · 0 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.58¢ per $1
- Polymarket · Seattle Seahawks -13.515¢
- Kalshi · Denver Broncos +13.582¢
Open 30 min · 724 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.56¢ per $1
- Kalshi · Sam Darnold Over 0.5 touchdowns4¢
- Polymarket · Sam Darnold Under 0.5 touchdowns94¢
Open 1 min · 220 contracts available · Risk: legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.53¢ per $1
- Kalshi · Seattle Seahawks +2.555¢
- Polymarket · Denver Broncos -1.541¢
Open 1 min · 5 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.52¢ per $1
- Polymarket · Seattle Seahawks -2.552¢
- Kalshi · Denver Broncos +2.544¢
Open 9 min · 732 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.51¢ per $1
- Kalshi · Over 40.545¢
- Polymarket · Under 40.551¢
Open 20 min · 812 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.50¢ per $1
- Polymarket · Over 38.548¢
- Kalshi · Under 39.548¢
Open 1 min · 5 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.28¢ per $1
- Polymarket · Over 48.520¢
- Kalshi · Under 48.577¢
Open 1.7 h · 750 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.25¢ per $1
- Polymarket · Over 42.51.5¢
- Kalshi · Under 43.597¢
Open 2 min · 5 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.22¢ per $1
- Polymarket · Seattle Seahawks -10.521¢
- Kalshi · Denver Broncos +10.576¢
Open 45 min · 152 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.21¢ per $1
- Kalshi · Over 48.58¢
- Polymarket · Under 48.590¢
Open 1.7 h · 500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.21¢ per $1
- Kalshi · Seattle Seahawks -5.58¢
- Polymarket · Denver Broncos +5.590¢
Open 1 min · 500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.17¢ per $1
- Polymarket · Over 40.522¢
- Kalshi · Under 41.575¢
Open 1.7 h · 3,585 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.08¢ per $1
- Polymarket · Seattle Seahawks +14.572¢
- Kalshi · Denver Broncos -13.525¢
Open 1 min · 30 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+1.07¢ per $1
- Polymarket · Seattle Seahawks -9.524¢
- Kalshi · Denver Broncos +9.573¢
Open 28 min · 2,099 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.97¢ per $1
- Kalshi · Seattle Seahawks -14.511¢
- Polymarket · Denver Broncos +16.587¢
Open 1 min · 500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.94¢ per $1
- Kalshi · Seattle Seahawks -9.528¢
- Polymarket · Denver Broncos +9.569¢
Open 1 min · 487 contracts available
MLB · Tampa Bay Rays @ Cleveland Guardians · 2026-10-15
+0.83¢ per $1
- DraftKings · Gavin Williams Over 7.5 strikeouts30.4¢
- Kalshi · Gavin Williams Under 7.5 strikeouts68¢
Open 21 min · 22 contracts available · Risk: book voids if the listed pitcher does not start; legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.83¢ per $1
- Kalshi · Seattle Seahawks +14.597¢
- Polymarket · Denver Broncos -13.51.9¢
Open 6 min · 1,250 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.75¢ per $1
- Polymarket · Seattle Seahawks +3.532¢
- Kalshi · Denver Broncos -2.565¢
Open 1 min · 3 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.75¢ per $1
- Kalshi · Rj Harvey Over 24.5 rushing yards14¢
- Polymarket · Rj Harvey Under 24.5 rushing yards84¢
Open 1 min · 12 contracts available · Risk: legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.73¢ per $1
- Kalshi · Seattle Seahawks +14.597¢
- Polymarket · Denver Broncos -10.52¢
Open 1 min · 182 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.67¢ per $1
- Kalshi · Rj Harvey Over 1.5 touchdowns3¢
- Polymarket · Rj Harvey Under 1.5 touchdowns96¢
Open 1 min · 5 contracts available · Risk: legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.64¢ per $1
- Kalshi · Over 18.596¢
- Polymarket · Under 22.53¢
Open 1 min · 5 contracts available
NFL · Buffalo Bills @ Las Vegas Raiders · 2026-10-18
+0.53¢ per $1
- Kalshi · James Cook Over 89.5 rushing yards55¢
- Polymarket · James Cook Under 89.5 rushing yards42¢
Open 1 min · 61 contracts available · Risk: legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.53¢ per $1
- Polymarket · Rj Harvey Over 1.5 touchdowns2.2¢
- Kalshi · Rj Harvey Under 1.5 touchdowns97¢
Open 1 min · 5 contracts available · Risk: legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.52¢ per $1
- Polymarket · Seattle Seahawks +8.553¢
- Kalshi · Denver Broncos -6.544¢
Open 1 min · 5 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.49¢ per $1
- Kalshi · Seattle Seahawks -6.55¢
- Polymarket · Denver Broncos +6.594¢
Open 1.5 h · 500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.49¢ per $1
- Kalshi · Emanuel Wilson Over 89.5 rushing yards5¢
- Polymarket · Emanuel Wilson Under 89.5 rushing yards94¢
Open 1 min · 2 contracts available · Risk: legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.48¢ per $1
- Polymarket · Seattle Seahawks +16.580¢
- Kalshi · Denver Broncos -14.518¢
Open 57 min · 151 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.42¢ per $1
- Polymarket · Seattle Seahawks -4.51.4¢
- Kalshi · Denver Broncos +6.598¢
Open 12 min · 82 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.42¢ per $1
- Polymarket · Cooper Kupp Over 1.5 touchdowns1.4¢
- Kalshi · Cooper Kupp Under 1.5 touchdowns98¢
Open 1 min · 5 contracts available · Risk: legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.42¢ per $1
- Polymarket · Seattle Seahawks -4.51.4¢
- Kalshi · Denver Broncos +5.598¢
Open 16 min · 231 contracts available
NFL · Chicago Bears @ Atlanta Falcons · 2026-10-18
+0.38¢ per $1
- DraftKings · Sam Roush Over 1.5 touchdowns0.6¢
- Kalshi · Sam Roush Under 1.5 touchdowns99¢
Open 4.0 h · 166 contracts available · Risk: book voids if the player sits; the exchange still settles; legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.37¢ per $1
- Polymarket · Seattle Seahawks -16.56¢
- Kalshi · Denver Broncos +16.593¢
Open 8 min · 40 contracts available
NFL · Chicago Bears @ Atlanta Falcons · 2026-10-18
+0.36¢ per $1
- Caesars · Sam Roush Over 1.5 touchdowns0.6¢
- Kalshi · Sam Roush Under 1.5 touchdowns99¢
Open 1 min · 166 contracts available · Risk: book voids if the player sits; the exchange still settles; legs may settle on different stat sources
NFL · Houston Texans @ Jacksonville Jaguars · 2026-10-18
+0.36¢ per $1
- Caesars · Lequint Allen Over 1.5 touchdowns0.6¢
- Kalshi · Lequint Allen Under 1.5 touchdowns99¢
Open 4.0 h · 300 contracts available · Risk: book voids if the player sits; the exchange still settles; legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.32¢ per $1
- Kalshi · Over 54.57¢
- Polymarket · Under 54.592¢
Open 9 min · 500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.32¢ per $1
- Polymarket · Over 42.51.5¢
- Kalshi · Under 44.598¢
Open 1 min · 5 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.32¢ per $1
- Polymarket · Over 42.51.5¢
- Kalshi · Under 45.598¢
Open 1 min · 5 contracts available
NFL · Buffalo Bills @ Las Vegas Raiders · 2026-10-18
+0.29¢ per $1
- DraftKings · Jackson Hawes Over 0.5 touchdowns6.2¢
- Kalshi · Jackson Hawes Under 0.5 touchdowns93¢
Open 11 min · 60 contracts available · Risk: book voids if the player sits; the exchange still settles; legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.28¢ per $1
- Kalshi · Seattle Seahawks +16.592¢
- Polymarket · Denver Broncos -14.57¢
Open 1 min · 18 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.23¢ per $1
- Kalshi · Seattle Seahawks -5.58¢
- Polymarket · Denver Broncos +6.591¢
Open 1 min · 500 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.21¢ per $1
- Polymarket · Seattle Seahawks -5.51.6¢
- Kalshi · Denver Broncos +6.598¢
Open 83 min · 170 contracts available
NFL · Tennessee Titans @ Indianapolis Colts · 2026-10-18
+0.21¢ per $1
- DraftKings · Chimere Dike Over 1.5 touchdowns0.8¢
- Polymarket · Chimere Dike Under 1.5 touchdowns99¢
Open 35 min · 20 contracts available · Risk: book voids if the player sits; the exchange still settles; legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.21¢ per $1
- Polymarket · Seattle Seahawks +1.522¢
- Kalshi · Denver Broncos +1.576¢
Open 1 min · 168 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.19¢ per $1
- Kalshi · Seattle Seahawks -4.53¢
- Polymarket · Denver Broncos +5.596.5¢
Open 56 min · 500 contracts available
NFL · Houston Texans @ Jacksonville Jaguars · 2026-10-18
+0.18¢ per $1
- Caesars · Cj Stroud Over 1.5 touchdowns0.8¢
- Polymarket · Cj Stroud Under 1.5 touchdowns99¢
Open 62 min · 10 contracts available · Risk: book voids if the player sits; the exchange still settles; legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.15¢ per $1
- Kalshi · Over 33.59¢
- Polymarket · Under 34.590¢
Open 1 min · 436 contracts available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.15¢ per $1
- Polymarket · Nate Adkins Over 0.5 touchdowns5.3¢
- Kalshi · Nate Adkins Under 0.5 touchdowns94¢
Open 1 min · 500 contracts available · Risk: legs may settle on different stat sources
NFL · Los Angeles Chargers @ Kansas City Chiefs · 2026-10-18
+0.14¢ per $1
- Caesars · Brashard Smith Over 1.5 touchdowns0.8¢
- Kalshi · Brashard Smith Under 1.5 touchdowns99¢
Open 3.6 h · 300 contracts available · Risk: book voids if the player sits; the exchange still settles; legs may settle on different stat sources
NFL · Arizona Cardinals @ Los Angeles Rams · 2026-10-18
+0.14¢ per $1
- Caesars · Jalen Brooks Over 1.5 touchdowns0.8¢
- Kalshi · Jalen Brooks Under 1.5 touchdowns99¢
Open 20 min · 942 contracts available · Risk: book voids if the player sits; the exchange still settles; legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.12¢ per $1
- Polymarket · Over 54.59¢
- Kalshi · Under 54.590¢
Open 1 min · 1 contract available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.11¢ per $1
- Polymarket · Courtland Sutton Over 1.5 touchdowns1.7¢
- Kalshi · Courtland Sutton Under 1.5 touchdowns98¢
Open 1 min · 5 contracts available · Risk: legs may settle on different stat sources
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
+0.11¢ per $1
- Polymarket · Jaylen Waddle Over 1.5 touchdowns1.7¢
- Kalshi · Jaylen Waddle Under 1.5 touchdowns98¢
Open 1 min · 5 contracts available · Risk: legs may settle on different stat sources
NFL · Houston Texans @ Jacksonville Jaguars · 2026-10-18
+0.07¢ per $1
- DraftKings · Cj Stroud Over 1.5 touchdowns0.9¢
- Polymarket · Cj Stroud Under 1.5 touchdowns99¢
Open 11 min · 10 contracts available · Risk: book voids if the player sits; the exchange still settles; legs may settle on different stat sources
NFL · Carolina Panthers @ Philadelphia Eagles · 2026-10-18
+0.03¢ per $1
- DraftKings · John Metchie Over 1.5 touchdowns0.9¢
- Kalshi · John Metchie Under 1.5 touchdowns99¢
Open 11 min · 343 contracts available · Risk: book voids if the player sits; the exchange still settles; legs may settle on different stat sources
NFL · New Orleans Saints @ New York Giants · 2026-10-18
+0.01¢ per $1
- DraftKings · Najee Harris Over 1.5 touchdowns2.8¢
- Kalshi · Najee Harris Under 1.5 touchdowns97¢
Open 22 min · 24 contracts available · Risk: book voids if the player sits; the exchange still settles; legs may settle on different stat sources
NHL · Panthers @ Senators · 2026-10-21
+0.01¢ per $1
- Polymarket · Panthers to win46¢
- Kalshi · Senators to win51¢
Open 1 min · 1 contract available
NFL · Seattle Seahawks @ Denver Broncos · 2026-10-15
0.00¢ per $1
- Kalshi · Rashid Shaheed Over 9.5 receiving yards72¢
- Polymarket · Rashid Shaheed Under 14.5 receiving yards26¢
Open 1 min · 45 contracts available · Risk: legs may settle on different stat sources
NFL · Chicago Bears @ Atlanta Falcons · 2026-10-18
0.00¢ per $1
- Kalshi · Over 59.527¢
- Polymarket · Under 60.571¢
Open 1 min · 5 contracts available
Design decisions
Verify every price against the page
A scraped number nobody checked is a liability. Each selection is matched to the button a person would click; a price the page doesn't show never reaches the scanner.
One bad label made 500 fake arbitrages
Early on, a sportsbook market for receptions on a single drive was read as a full-game prop, and 79¢ "edges" appeared everywhere. Now a book's prop ladder must be internally consistent, and any edge above 5¢ is flagged as suspect, not reported.
Settlement rules matter as much as price
A book voids a player prop if the player sits; an exchange still settles it. Legs with different overtime, stat-source or void rules are flagged, so a "risk-free" pair that isn't gets labeled as such.
Stream instead of re-scraping
Reloading every page took about 30 minutes per NFL slate, far too slow for prices that move in seconds. Persistent pages plus live exchange feeds keep every leg 5 to 20 seconds old, and a changed game re-prices in under 0.1 seconds.
Every run
The scanner runs for four hours every evening, rotating between sports, and this page updates itself after each run. A dot above the line is a run in which some pair crossed break-even.
| Started (UTC) | What it watched | Hours | Pairs | Price updates | Arbitrages |
|---|---|---|---|---|---|
| 2026-10-15 23:00 | NFL: draftkings + caesars; props:receiving_yards, props:rushing_yards, props:touchdowns | 4 | 644 | 678,596 | 130 |
| 2026-10-15 03:37 | MLB + NHL: DraftKings + Caesars; NHL goals/points, MLB strikeouts/total bases + game lines | 4 | 205 | 52,532 | 2 |
| 2026-10-14 21:54 | NFL: DraftKings + Caesars; receiving/rushing yards, touchdowns + game lines | 4 | 401 | 211,307 | 6 |
Data updated October 16, 2026. A research tool: it never places a bet.
Stack
- Python
- Patchright (headed Chromium)
- MCP servers (FastMCP)
- WebSockets
- DuckDB
- Windows + WSL, Tailscale