Live odds comparison
2028 Republican Nomination odds: Polymarket vs Kalshi
Compare all-in prices for a $100 order, including estimated taker fees, on reviewed equivalent contracts only. Coverage is limited to reviewed equivalent contracts priced on both venues, not every candidate.
Counts cover all available matched outcome sides (Yes and No are separate rows) in this family snapshot, not a daily average. Rows missing either venue's price are excluded. Snapshot: .
Live Polymarket and Kalshi price comparison
All-in cents are the effective price per payout unit, including estimated taker fees. Saving is the lower effective price relative to the higher one. Quotes can move before execution.
| Outcome | Polymarket all-in | Kalshi all-in | Cheaper venue | Saving | Details |
|---|---|---|---|---|---|
| Yes · J.D. Vance wins and accepts the 2028 Republican presidential nomination | 51.90¢ | 46.74¢ | Kalshi | 9.95% |
Open on Kalshi → Quote details |
| Yes · Marco Rubio wins and accepts the 2028 Republican presidential nomination | 16.23¢ | 21.12¢ | Polymarket | 23.16% |
Open on Polymarket → Quote details |
| Yes · Ron DeSantis wins and accepts the 2028 Republican presidential nomination | 3.01¢ | 4.69¢ | Polymarket | 35.83% |
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| No · Elise Stefanik wins and accepts the 2028 Republican presidential nomination long shot | 99.90¢ | 99.91¢ | Polymarket | 0.01% |
Open on Polymarket → Quote details |
| No · Tulsi Gabbard wins and accepts the 2028 Republican presidential nomination long shot | 99.62¢ | 99.82¢ | Polymarket | 0.20% |
Open on Polymarket → Quote details |
| No · Ron DeSantis wins and accepts the 2028 Republican presidential nomination | 97.31¢ | 95.99¢ | Kalshi | 1.35% |
Open on Kalshi → Quote details |
| No · Marco Rubio wins and accepts the 2028 Republican presidential nomination | 84.93¢ | 82.08¢ | Kalshi | 3.35% |
Open on Kalshi → Quote details |
| No · J.D. Vance wins and accepts the 2028 Republican presidential nomination | 50.26¢ | 57.73¢ | Polymarket | 12.94% |
Open on Polymarket → Quote details |
Buttons open the cheaper venue for that row. Links may carry referral tracking.
Frequently asked questions
Which 2028 Republican Nomination contract is priced highest on both Polymarket and Kalshi?
Among the contracts VoxOdds can compare on both venues, J.D. Vance wins and accepts the 2028 Republican presidential nomination has the highest average Yes all-in price: Polymarket 51.90¢ and Kalshi 46.74¢ for a $100 order, including estimated taker fees. This is not necessarily the overall favorite. Coverage is limited to reviewed equivalent contracts priced on both venues, not every candidate.
Is Polymarket or Kalshi cheaper for 2028 Republican Nomination contracts?
In this 2028 Republican Nomination snapshot of 8 matched outcome sides, Polymarket is cheaper on 5 and Kalshi on 3. The median saving in effective price is 6.65% for a $100 all-in order. This snapshot is not a daily average; prices can change.
Why do Polymarket and Kalshi prices differ for the same 2028 Republican Nomination contract?
Not necessarily. Each venue has its own order-book prices and available depth. For the same reviewed outcome, the effective price for a $100 all-in order can differ after estimated fees. Displayed probabilities are not executable quotes. It depends on the contract and fill prices. VoxOdds models Polymarket taker fees as shares × live fee rate × price × (1-price). Kalshi uses M × 0.07 × contracts × price × (1-price), with M=0 for explicitly listed zero-taker-fee series and M=1 otherwise. Quotes include estimated taker fees and conservative Kalshi rounding; the venue order preview remains authoritative.
Where can I get this data?
See the comparison landing at https://voxodds.com/polymarket-vs-kalshi, the family-filtered public API at https://voxodds.com/api/v1/executable-opportunities?amount_usd=100&family=republican_nominee_2028, the open dataset at https://github.com/softdevfz/polymarket-kalshi-price-gaps, and the MCP server at https://voxodds.com/mcp.
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Market-implied odds, not financial advice. Outbound venue links may carry referral tracking.