Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Kalshi UK) Pick polygram.ink (preferred broker) |
51% | 49% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
51% | 49% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| September 30? | 51% |
| August 30? | 38% |
| August 9? | 16% |
Market context
Polymarket has **OH-07 dropout** priced at a **25% chance of Yes**, which means traders are assigning a one-in-four likelihood that Max Miller will withdraw or formally suspend his 2026 campaign before the 9 August 2026 settlement cut-off. For a contract settled on USDC via Polygon conditional tokens, the key question is not whether the race is politically messy, but whether Miller makes an official exit announcement or his authorised representatives do so before 11:59 pm ET.
The current price sits below the more elevated “drop-out” readings seen in some recent coverage, but the market has already been conditioned by a sequence of comparable cases where sitting members resisted pressure until a formal deadline passed. Miller has publicly said he is staying in the race, and reports have also noted that Republicans would need to move quickly to replace him on the ballot if he changed course. That makes the market sensitive to a narrow set of precedents: incumbents often absorb scandal pressure without withdrawing, but once party officials, donors and national figures coordinate around a replacement, late exits can still happen fast.
For traders, the immediate catalysts are obvious: an official statement from Miller, any legal representative acting on his behalf, or a campaign suspension notice. The other watchpoint is whether Republican organisers in the district convene a substitute process before the ballot deadline, because credible reporting has said Ohio law effectively forces a very tight timetable for replacement. Recent coverage from the New York Times and NPR has emphasised both the pressure on Miller and the looming ballot mechanics, while ABC News reported Miller explicitly said he would not drop out amid the allegations.
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 Kalshi UK, which mirrors the Polymarket order book directly.
Resolution & payout
At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.
On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.
UK Frequently Asked Questions
- Is this market available outside the US?
- Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.
- 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%.
Trade Will Max Miller drop out of the OH-07 race by 2026? on Kalshi UK
Live order book, 0% fees, USDC settlement in seconds.
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