Colts vs. Patriots

Platform comparison

Market context

The Indianapolis Colts face the New England Patriots in an NFL preseason matchup on 13 August at 7:30 PM ET. The current market probability of 39% for a Colts victory reflects modest confidence in Indianapolis, with the Patriots implied at 61% despite their recent roster transitions. This is a preseason game, meaning rosters remain fluid, starters see limited snaps, and outcomes carry less predictive weight than regular-season contests.

Preseason win probabilities historically diverge sharply from regular-season expectations because coaching staff prioritise player evaluation and injury prevention over competitive outcomes. The Patriots have undergone significant personnel changes following their 2023 season, whilst the Colts retain more continuity around quarterback Anthony Richardson. However, preseason results often hinge on which teams field deeper rotations of reserve players rather than underlying talent. Comparable August matchups between AFC East and AFC South teams show wide variance in predictability; a 39% probability for the underdog suggests the market is pricing in genuine uncertainty rather than strong directional conviction.

Traders monitoring this market should track injury reports released in the 48 hours before kickoff, as preseason rosters shift frequently. Weather conditions at the venue and any last-minute coaching decisions about starter participation could shift implied probabilities materially. For programmatic approaches, conditional orders tied to roster announcements or weather alerts would capture edge cases where the market reprices. The settlement window closes immediately after the final whistle, so late-breaking lineup changes warrant real-time monitoring rather than static position-setting.

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

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

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.

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%.