Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Who Will Win) Pick polygram.ink (preferred broker) |
70% | 30% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
70% | 30% | 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 |
|---|---|
| 140-150m | 70% |
| 130-140m | 22% |
| 150-160m | 9% |
| <130m | 1% |
| 160-170m | 1% |
| 170-180m | 0% |
| 180m+ | 0% |
Market context
The second weekend gross for *Spider-Man: Brand New Day* is a classic favourite/underdog spot: the market’s **1% YES** implies an ultra-low tail outcome, while the consensus from box-office trackers is that the film will still post a very large sophomore frame after a record-breaking domestic opening. Forbes said the picture was already on track for at least **$1.5 billion** worldwide by the end of its second weekend, even under a conservative “large drop” assumption, with a working range of roughly **55-60%** off opening momentum rather than a collapse.[1] That framing matters because the market resolves on The Numbers’ final domestic 3-day weekend figure, so the real question is not whether attendance falls, but whether it falls far enough to land in one of the lowest bracket outcomes.
Comparable cases suggest the floor is usually higher for franchise-event openings with strong fan turnout, premium formats and broad theatre coverage. The Numbers’ own weekend preview still described Spider-Man as poised to “dominate for second weekend”, while its forecast page showed an opening already at **$360.09 million** domestic, which leaves a very high base to defend even if the drop is steep.[2][3] The crowd’s 1% price looks more like a contrarian bet against extreme retention than a mainstream read; value, if any, sits in the higher gross brackets unless weekday business has already front-loaded demand more aggressively than expected. A second-weekend number well below market chatter would likely need a sharp post-opening slowdown, not just a normal superhero fall-off.[1][2]
The main catalysts to watch are the finalised The Numbers daily grosses, particularly Friday-Sunday actuals versus any studio estimates, plus whether premium-screen play remains strong enough to slow the decline.[3] Recent coverage from The Guardian and CNN confirms the film opened at roughly **$932 million worldwide** and **$355 million domestic**, underlining how much demand was pulled forward immediately.[7][13] That makes the trader’s focus simple: compare the reported Saturday-Sunday hold to the opening’s pace, because any sign of front-loading, audience saturation or sharper-than-expected weekday decay would push the second-weekend domestic total down towards the low-probability brackets.[1][3]
Methodology
This page reviews "Spider-Man: Brand New Day" 2nd Weekend Box Office (Lower Strikes) across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win, which mirrors the Polymarket order book at 0% fees.
Resolution & payout
Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.
Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.
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.
- 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%.
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