KY-04 Republican Primary: Margin of Victory

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Active sub-markets

Market context

The underlying event is the 2026 Kentucky 4th District Republican primary on 19 May, and the market is about the vote gap between the top two finishers, not just the winner. On the information available so far, the crowd-implied 0% YES reflects a settled expectation that the eventual margin will not meet the market’s threshold, rather than a view on who won outright. For German users, the GlüStV treatment will depend on whether the activity is characterised as gambling or a financial-style speculative contract under local law; for US users, CFTC jurisdiction can still matter even where a platform is accessible offshore. The “no-KYC up to $1,500” feature means smaller balances may be usable with lighter identity checks, but it does not change the legal or tax status of participation.

Recent comparable congressional primaries suggest margin markets can move sharply only when late count developments, withdrawals, or clerical issues alter the final certified spread. In this race, the key benchmark is the certified first- and second-place percentages, so a narrow result, a decisive win, or an administrative correction after election night all matter more than headline commentary. Traders should watch county-by-county reporting, any concession or challenge filings, and the state’s certification timetable; the market typically resolves on the final official result, not on media projections. Reuters reported on 19 May that Ed Gallrein defeated Thomas Massie in the Republican primary after Trump’s endorsement, which supports the broader expectation that the race’s decisive factor is the size of the winning margin rather than the identity of the nominee.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews KY-04 Republican Primary: Margin of Victory across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.