Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Prediction Market UK) Pick polygram.ink (preferred broker) |
61% | 39% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | See live odds → |
Polymarket (direct) polymarket.com |
61% | 39% | 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 | 61% |
| December 31 | 42% |
| September 30 | 28% |
| July 15 | 21% |
| February 28 | 0% |
| March 31 | 0% |
Market context
Samuel Alito, the 76-year-old Associate Justice of the US Supreme Court, has given no public indication that he plans to retire, which is why the prediction market on his departure currently shows a 0% chance of a "Yes" outcome. In prediction markets, a "Yes" share pays out if the event occurs—here, if Alito announces his retirement by the settlement date—while a "No" share pays out if it does not. This market resolves only on an official announcement from Alito himself, regardless of when the retirement actually takes effect.
Historically, Supreme Court justices often remain on the bench well past the average retirement age of 80, with many serving into their late 70s or 80s unless health issues or political shifts intervene. Alito, who replaced Sandra Day O’Connor in 2006 and authored the landmark *Dobbs* decision overturning *Roe v. Wade*, sits at the apex of his judicial influence and has previously declined to comment on retirement plans when asked by CNN in May 2025[1]. Sources close to him have consistently reported that he has no intention of stepping down, reinforcing the market’s current pricing[1][2].
Traders should monitor any sudden official statements from Alito, the timing of the Supreme Court’s term end (late June or early July), and whether President Trump—who has publicly supported Alito staying on the bench—exerts pressure for a retirement to secure a fourth appointment[2][7]. Recent reports from April 2026 suggest the White House may be quietly encouraging the court’s oldest justices to retire, though no formal announcement has emerged[9]. Until such a declaration is made, the probability of a "Yes" remains negligible.
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.
FAQ
- 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.
- What does Polymarket cost to trade?
- Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.
- How fast are USDC deposits?
- Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within 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.
Trade Will Samuel Alito announce his retirement by 2026? on Prediction Market UK
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