Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Prediction Market UK) Pick polygram.ink (preferred broker) |
35% | 65% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | See live odds → |
Polymarket (direct) polymarket.com |
35% | 65% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | See live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | See live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | See live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | See live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| June 30, 2027 | 35% |
| December 31 | 6% |
| September 30 | 1% |
| July 15 | 0% |
| February 28 | 0% |
| March 31 | 0% |
Market context
Samuel Alito, the 78-year-old Associate Justice who authored the majority opinion overturning Roe v. Wade in June 2022, has not signalled any intention to step down from the Supreme Court. A YES share in this market pays out if he publicly announces his retirement by 31 December 2026; a NO share pays out if he makes no such announcement by that date. The 2% implied probability reflects the low base rate of sitting justices announcing departures in any given two-year window, combined with Alito's apparent commitment to remaining on the bench.
Retirement announcements from Supreme Court justices are rare events, typically occurring when a justice reaches advanced age, faces health concerns, or seeks to allow a preferred administration to appoint their successor. Justice Stephen Breyer announced his retirement in June 2022 at age 83, whilst Justice Anthony Kennedy departed in 2018 at 81. Alito, appointed in 2006 and currently serving under a Republican administration, has given no public indication of imminent departure. Historical precedent suggests justices in their late 70s and early 80s often serve for several more years unless unexpected circumstances arise.
Traders monitoring this market should track Alito's health disclosures, any statements from the Justice himself regarding his future tenure, and broader shifts in the political landscape that might influence his calculus. The Supreme Court's 2024–25 term schedule and any significant opinions Alito authors will be watched for hints about his engagement level. News coverage of his activities, public appearances, and any official communications from the Court remain the primary sources for detecting movement toward an announcement.
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
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
- 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%.
Trade Will Samuel Alito announce his retirement by 2027? on Prediction Market UK
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