Seahawks vs. Cardinals Week 2 Odds & Predictions
Seattle visits Arizona for an NFC West game at State Farm Stadium on Sunday, September 20 at 4:25 p.m. ET on Fox. On the current Week 2 board, Seattle leads at -365 (78.5% implied probability), while Arizona trades at +365 (21.5%). Our Seahawks vs. Cardinals tracker combines exact full-game winner prices from Kalshi and Polymarket into a volume-weighted consensus and shows the underlying venue odds, spreads and volume, with market data refreshed every hour.
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Current Seahawks vs. Cardinals Odds: Seattle Favorite to Win
Current probabilities across platforms with liquidity indicators
SESeattle
Vol —
Spread 1.0%
Agg
78.5%↓ -3.0%
U
79.5%
K
78.5%
P
78.5%
ARArizona
Vol —
Spread 0.5%
Agg
21.5%↑ +3.5%
K
21.5%
P
21.5%
U
21.0%
| Outcome | Aggregated | Spread | Volume | Kalshi | Polymarket | Polymarket US |
|---|---|---|---|---|---|---|
SE Seattle | 78.5% ↓ -3.0% | 1.0% | — |
Kalshi
78.5%
|
Polymarket
78.5%
|
Polymarket US
79.5%
|
AR Arizona | 21.5% ↑ +3.5% | 0.5% | — |
Kalshi
21.5%
|
Polymarket
21.5%
|
Polymarket US
21.0%
|
Week 2 line movement: Seahawks vs. Cardinals
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Chart settings
Arbitrage Scanner
Current cross-venue opportunities with fee calculations
Pairs (Venue-to-Venue)
| Outcome | Venue Pair | Leg A (Buy) | Leg B (Sell) | Gross Spread | After Fees | Actionable | Trade Now |
|---|---|---|---|---|---|---|---|
AR Arizona |
Polymarket US
→
Polymarket | Buy @ U 21¢ | Sell @ P 76¢ | +55.00% | +55.00% |
Yes | |
SE Seattle |
Kalshi
→
Polymarket US | Buy @ K 80¢ | Sell @ U 79¢ | -1.00% | -1.80% |
No |
Outcome Diff
| Outcome A | Outcome B | Venue | A Odds | B Odds | Diff | Strategy | Trade Now |
|---|---|---|---|---|---|---|---|
SE Seattle |
AR Arizona |
Polymarket US | A 79.5% | B 21.0% | +58.50% | Buy spread | |
SE Seattle |
AR Arizona |
Kalshi | A 78.5% | B 21.5% | +57.00% | Buy spread | |
SE Seattle |
AR Arizona |
Polymarket | A 78.5% | B 21.5% | +57.00% | Buy spread |
After-fee spreads apply the configured taker-fee model per side. Depth/slippage is not modeled in this scanner.
Methodology & Data Mapping
How we aggregate, normalize, and map cross-platform data
Default: Volume-Weighted Average Price (VWAP)
Weights each mapped market by its reported 24H USD volume at snapshot time. If volume is unavailable, we fall back to a simple average for that snapshot.
Use the VWAP/Simple toggle above the chart to switch aggregation views.
Kalshi: Official API (best bid/ask + last + 24H volume/liquidity when available).
Polymarket: Market data via their API (token prices + best bid/ask + 24H volume/liquidity when available).
Polymarket US: Gateway market data (yes/no prices + best bid/ask + market stats for volume/open interest where available).
Event data is updated hourly. Older history is downsampled.
Each event links one or more markets per provider. We normalize labels, map provider outcomes into a shared outcome list, and merge mapped markets where appropriate.
Cross-venue spread: Max–min difference across available venue probabilities for the same outcome.
Liquidity: Relative per-venue indicators based on provider liquidity fields (no depth/slippage modeling).
Arbitrage: Computed from best bid/ask when available (otherwise mid); after-fee spread applies the configured fee model only.
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