Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Who Will Win) Pick polygram.ink (preferred broker) |
86% | 14% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
86% | 14% | 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 |
|---|---|
| 70-72m | 86% |
| 72m+ | 9% |
| 68-70m | 2% |
| <66m | 0% |
| 66-68m | 0% |
Market context
Spider-Man: Brand New Day is scheduled for theatrical release on 9 August 2026, with this market tracking its domestic box office performance during the third weekend (14–16 August). The 0% implied probability reflects the absence of any confirmed production, distribution deal, or official release announcement as of the current date. Sony Pictures has not publicly greenlit a film under this title, making the market contingent on a future greenlight and successful theatrical run.
Third-weekend box office trajectories depend heavily on opening performance, word-of-mouth, and competitive landscape. Spider-Man films typically exhibit strong front-loading; the 2018 *Into the Spider-Verse* dropped 56% in its second weekend and a further 48% in its third, landing around $7.3 million domestically in weekend three. The 2023 *Across the Spider-Verse* saw comparable decay patterns. These precedents suggest third-weekend grosses for Spider-Man properties cluster between $5–10 million, though franchise fatigue, critical reception, and summer competition materially shift outcomes.
Traders should monitor Sony's official greenlight announcement and release-date confirmation, which would shift this market from theoretical to actionable. The August 2026 release slot places the film in late summer, competing against established franchises and potential counter-programming. Marketing spend, critical reviews from early screenings, and domestic audience appetite for Spider-Man content in 2026 will determine whether third-weekend performance lands in lower or higher brackets. Until production is formally announced, the 0% probability reflects genuine uncertainty rather than consensus bearishness.
Methodology
Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.
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 Who Will Win. 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%.
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