South Carolina Senate Special Republican Primary: First Round Winner

Platform comparison

Market context

The first round of South Carolina’s special Republican Senate primary will decide who finishes top of the field on 11 August, and a **YES** share pays out if that named candidate has the most valid votes in that first count. In prediction markets, **YES** means the event happens and **NO** means it does not, so the price is the market’s implied probability; at **0% YES**, traders are effectively saying the winner is not expected to be known from the initial primary round under current pricing.

That 0% reading is best understood against the state’s recent Republican Senate primaries, where a clear front-runner has often emerged well before any runoff. In June 2026, Lindsey Graham won the regular GOP Senate primary with 56.8% to Mark Lynch’s 28.9%, avoiding a second round entirely.[4][6][15] More broadly, South Carolina Republican statewide contests tend to produce decisive plurality winners unless the field is highly fragmented, which is exactly the sort of structure traders watch in first-round winner markets.[17]

The main catalysts now are filing and ballot changes, candidate withdrawals, endorsements, and turnout signals in the final days before voting. South Carolina’s election calendar shows the first round on 11 August and a runoff, if needed, on 25 August.[7] Live result pages from AP, NPR, NBC News and local station WLTX are likely to be the fastest public sources once polls close, and the market’s settlement rule is straightforward: the candidate with the most valid votes in round one wins, with alphabetical order used only if there is a tie on votes.[1][2][4][5]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Prediction Market UK, which mirrors the Polymarket order book directly.

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.

UK Frequently Asked Questions

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Prediction Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.