Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
66% | 34% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
66% | 34% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 140-150m | 66% |
| 130-140m | 26% |
| 150-160m | 9% |
| 160-170m | 2% |
| <130m | 1% |
| 170-180m | 0% |
| 180m+ | 0% |
Market context
*Spider-Man: Brand New Day* is already starting its second weekend from an unusually high domestic base, so the question is not whether it remains a huge box-office performer, but how sharply the drop softens after an enormous launch. Sony and the trades put the opening at about $355 million domestically, and recent coverage has suggested a second-weekend domestic range around $135 million to $140 million, with some forecasts still pointing higher if premium-format demand holds up.[14][2] For this market, the key settlement issue is the final 3-day weekend figure on The Numbers, not studio estimates, so late updates and final weekend reconciliation matter more than headline tracking.[4]
The crowd-implied 1% YES looks far below the public box-office consensus, which suggests the market is pricing in either a very specific high bracket or a materially different settlement interpretation. Comparable superhero launches with huge opening weekends usually see steep second-frame declines, but *Spider-Man* has historically shown stronger-than-average legs thanks to brand strength and repeat viewings, especially when IMAX and other premium screens remain in play.[1][2] That makes the current quote easier to read as a thin-liquidity market than as a direct forecast of theatrical demand.
Traders should watch for weekend theatre-count changes, premium-format retention, and any fresh trade reporting on Friday and Saturday grosses, because those are the inputs most likely to move the eventual The Numbers figure into a different bracket.[2] On-chain, the event settles in USDC, so the main crypto angle is broader market liquidity rather than film-specific correlation; if BTC and ETH are choppy, risk appetite on prediction venues can tighten, but the settlement itself remains a simple cash outcome once the box-office number is final.
Methodology
This page reads "Spider-Man: Brand New Day" 2nd Weekend Box Office (Lower Strikes) on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.
Resolution & payout
Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.
Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.
UK Frequently Asked Questions
- What are crypto prediction markets?
- Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.
- Why USDC and not ETH or USDT?
- USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.
- 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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