Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Kalshi UK) Pick polygram.ink (preferred broker) |
81% | 19% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
81% | 19% | 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 |
|---|---|
| <900m | 81% |
| 900 - 920m | 13% |
| 920 - 940m | 2% |
| 940 - 960m | 1% |
| 1080m+ | 1% |
| 960 - 980m | 0% |
| 980 - 1000m | 0% |
| 1000 - 1020m | 0% |
| 1020 - 1040m | 0% |
| 1040 - 1060m | 0% |
| 1060 - 1080m | 0% |
Market context
Sony's Spider-Man: Brand New Day opens on 31 July 2026, with traders on Polymarket currently pricing a 79% probability that the film will gross above the higher strike threshold domestically by month-end. The contract settles on finalised box office figures from The Numbers, covering the opening month through 31 August 2026. On-chain USDC liquidity reflects confidence in a strong opening weekend and sustained August performance, though the exact strike level remains the key variable determining whether conditional tokens resolve in-the-money.
Spider-Man films have historically demonstrated front-loaded domestic grosses during their opening month. The 2019 Spider-Man: Far From Home earned £95m domestically in its first month, whilst 2021's No Way Home grossed £260m in the same window—though that film benefited from pandemic pent-up demand and the multiverse narrative. Brand New Day enters a different competitive landscape, with summer 2026 already populated by established franchises. The current 79% pricing suggests traders expect performance closer to Far From Home's trajectory than No Way Home's exceptional run, implying confidence in solid but not record-breaking August numbers.
Critical factors shaping the settlement include Sony's marketing spend announcements, which typically intensify in June, and the film's critical reception following early screenings. Tracking data from trade publications like Variety and The Hollywood Reporter will provide weekly updates on audience sentiment and projected opening weekend figures from late July onwards. International box office performance, whilst not affecting this contract's settlement, often signals domestic momentum. Any significant production delays or release date shifts announced before July would immediately reprrice the conditional tokens on Polygon.
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 Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.
- 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.
- 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 "Spider-Man: Brand New Day" total domestic gross by … on Kalshi UK
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