Texas Republican Senate Primary Winner

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Active sub-markets

Market context

Texas Republicans are set to choose their US Senate nominee in a May 26 runoff, with incumbent John Cornyn facing Attorney General Ken Paxton after neither cleared 50% in the March primary. The race is unusually close for a sitting senator: Cornyn led the first round with 41.9% to Paxton’s 40.7%, while Wesley Hunt’s 13.5% has become the main source of transferable support. In comparable Texas runoffs, the first-round leader often has an organisational advantage, but hard-right consolidation can still overturn it if the trailing candidate captures most third-place voters.

For market reading, the key comparison is between the runoff arithmetic and any candidate-specific polling, rather than the March margin alone. Public reporting has consistently treated the contest as volatile and expensive, with the University of Houston’s Hobby School and local coverage flagging the runoff as the decisive moment. A recent San Antonio Report piece noted the crowded primary, and Wikipedia’s vote totals show Cornyn and Paxton separated by just over 30,000 votes, which is small enough that turnout shifts could matter more than ideology. If sportsbook or prediction-market lines diverge materially from analyst consensus, the likely reason will be assumptions about Hunt voters, suburban turnout, and whether anti-Paxton or anti-Cornyn sentiment proves more durable over the final week.

The main catalysts are the Texas Republican Party’s runoff result announcement on 26 May and any late polling or turnout indicators beforehand. Watch for endorsements from Hunt or defeated primary rivals, as well as whether his voters break cleanly to one side. Because the market resolves on the party’s first announcement, any delay, recount talk, or legal dispute after Election Day should matter less than the initial certified declaration unless reporting is overwhelmingly consistent.

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Methodology

This page reviews Texas Republican Senate Primary Winner 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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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.