Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
57% | 43% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
57% | 43% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| September 30? | 57% |
| August 30? | 38% |
| August 9? | 23% |
Market context
Max Miller is still the sitting Republican representative for Ohio’s 7th District, and the market is ultimately about whether he formally withdraws or suspends his 2026 campaign before the settlement deadline. Recent coverage says he has publicly denied the allegations against him and, as of this week, said he intends to stay in the race, while Ohio officials are watching a narrow window in which party leaders could replace him on the ballot if he exits in time.[2][3][7][14]
The current **18%** yes-implied probability is consistent with a market that is pricing in pressure, but not a clear capitulation. Comparable congressional dropout markets tend to move most sharply when the candidate issues a direct withdrawal statement, when a party filing deadline makes replacement mechanically useful, or when a formal investigation materially changes the odds of campaign continuation; here, the House Ethics probe, the public calls for him to step aside, and reports of an intended $1 million campaign injection all cut in different directions.[3][7][14] That makes the contract especially sensitive to the exact wording of any announcement rather than broader political chatter.
For traders, the main catalyst is a direct statement from Miller or his legal team, since the market resolves on official withdrawal or suspension language rather than rumour. The secondary driver is the ballot-timing regime in Ohio: reporting says Republicans need notice and a meeting before a replacement can be chosen, which creates a hard procedural constraint on any late exit.[7][14] In on-chain terms, this is a plain USDC-settled event contract, so pricing should respond to headline risk rather than BTC or ETH direction unless broader crypto volatility is sharp enough to affect liquidity and funding across prediction-market books.
Methodology
Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.
Resolution & payout
Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.
Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.
UK Frequently Asked Questions
- What are crypto prediction markets?
- Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.
- Why USDC and not ETH or USDT?
- USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.
- 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%.
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