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MA-09 House Election Margin of Victory on Polymarket US
This market will settle to Yes if the Democratic Party nominee's margin of victory in the 2026 MA-09 House election is between 0% and 5%. Outcome sourced from relevant state election authorities. The margin of victory is calculated as the absolute difference in vote share percentages between the candidate that receives the most valid votes in the specified election and the candidate that receives the second-most valid votes in the specified election. A candidate's vote share percentage will be calculated by dividing the total number of valid votes received by the candidate by the total number of valid votes cast in the election. If the specified candidate does not receive the most valid vo
The cover charge
| If you buy at | Fee per contract | On $50 | Win rate to break even |
|---|---|---|---|
| 30¢ | 2.0¢ | $3.32 | 32.0% |
| 50¢ (now) | 2.4¢ | $2.38 | 52.4% |
| 70¢ | 2.0¢ | $1.43 | 72.0% |
| 90¢ | 0.9¢ | $0.47 | 90.9% |
Resting (maker) orders pay nothing; orders that take liquidity pay the fee. Formula: 9.5% × price × (1 − price) per share on orders that take liquidity (accounts under $10,000 of 30-day volume; 6.95% in a new account's first week and above $250,000). Break-even assumes you hold to settlement; trading out early pays the fee twice.
Who actually wins this market
- Whoever posts the resting orders and collects the spread without paying a fee.
- The venue, on every fee.
- Not, on average, the person clicking buy because the chart is going their way. That was us.
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