Dota 2: Team Spirit vs Aurora (BO3) - The International Group Stage

Platform comparison

Market context

Team Spirit and Aurora face off in a best-of-three Dota 2 fixture during The International's group stage on 13 August 2026, with the match scheduled for 22:00 ET. The Polymarket contract currently prices Team Spirit's victory at 56% implied probability, reflecting modest favouritism despite Spirit's historical pedigree in competitive Dota. Settlement hinges on a straightforward binary outcome: Spirit wins the series, Aurora wins the series, or the match fails to occur (triggering a 50-50 split). The conditional token structure on Polygon means traders holding YES tokens receive full value only if Spirit prevail; NO holders profit if Aurora take the series. USDC collateral underpins both sides, with the 7-day postponement window extending from the original 22:00 ET start time.

Historical context matters here. Team Spirit won The International 2021 and reached the grand final in 2022, establishing them as a tier-one outfit capable of sustained deep runs. Aurora, by contrast, remains a secondary-tier squad without major LAN victories. The 56% pricing reflects this asymmetry but acknowledges that group-stage matches often feature tighter competition than knockout stages, and Aurora's recent form or roster changes could narrow the gap. Comparable International group-stage upsets have occurred, though favourites typically hold their ground.

Traders should monitor roster confirmations and scrim results in the week preceding 13 August, as last-minute stand-ins or visa complications have disrupted International schedules historically. Patch changes or hero pool shifts announced before the event could also shift the matchup dynamics. The settlement window closes at 08:00 UTC on 14 August, allowing roughly ten hours post-match for resolution confirmation.

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 PolyGram. 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%.