Dolphins vs. 49ers Week 2 Odds & Predictions
Miami travels to Levi's Stadium for a Week 2 cross-conference matchup with San Francisco on Sunday, September 20 at 4:25 p.m. ET on Fox. Market consensus currently gives San Francisco a 84.5% chance to win (-545), compared with Miami at 15.5% (+545). The Dolphins vs. 49ers tracker aggregates exact game-winner pricing and volume from Kalshi and Polymarket, calculates a volume-weighted line and highlights venue-level differences with hourly updates.
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Current Dolphins vs. 49ers Odds: San Francisco Favorite to Win
Current probabilities across platforms with liquidity indicators
SFSan Francisco
Vol —
Spread 1.5%
Agg
84.5%↑ +1.5%
K
84.5%
P
84.0%
U
83.0%
MIMiami
Vol —
Spread 2.0%
Agg
15.5%↓ -2.0%
U
17.5%
P
16.0%
K
15.5%
| Outcome | Aggregated | Spread | Volume | Kalshi | Polymarket | Polymarket US |
|---|---|---|---|---|---|---|
SF San Francisco | 84.5% ↑ +1.5% | 1.5% | — |
Kalshi
84.5%
|
Polymarket
84.0%
|
Polymarket US
83.0%
|
MI Miami | 15.5% ↓ -2.0% | 2.0% | — |
Kalshi
15.5%
|
Polymarket
16.0%
|
Polymarket US
17.5%
|
Week 2 line movement: Dolphins vs. 49ers
Hover for details · Cursor-synced tooltips
Tap "Chart settings" to adjust the chart.
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 |
|---|---|---|---|---|---|---|---|
SF San Francisco |
Polymarket
→
Kalshi | Buy @ P 17¢ | Sell @ K 84¢ | +67.00% | +66.16% |
Yes | |
MI Miami |
Kalshi
→
Polymarket US | Buy @ K 16¢ | Sell @ U 17¢ | +1.00% | +0.84% |
No |
Outcome Diff
| Outcome A | Outcome B | Venue | A Odds | B Odds | Diff | Strategy | Trade Now |
|---|---|---|---|---|---|---|---|
SF San Francisco |
MI Miami |
Kalshi | A 84.5% | B 15.5% | +69.00% | Buy spread | |
SF San Francisco |
MI Miami |
Polymarket | A 84.0% | B 16.0% | +68.00% | Buy spread | |
SF San Francisco |
MI Miami |
Polymarket US | A 83.0% | B 17.5% | +65.50% | 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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