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

Platform comparison

Market context

Team Spirit, the reigning International champions from 2021, face Xtreme Gaming in a best-of-three opening match at The International Group Stage on 13 August 2026. The fixture represents a significant test for both rosters, with Team Spirit seeking to maintain their competitive standing in the post-TI landscape whilst Xtreme Gaming, a Chinese organisation, attempt to prove their mettle against one of the scene's most decorated teams. The 63% implied probability favours Team Spirit, reflecting their historical pedigree and consistent performance at Valve's flagship tournament.

Team Spirit's track record at International events provides substantial grounding for the current odds. The organisation has finished top-eight at every International appearance since 2018, with their 2021 championship victory establishing them as a benchmark for sustained excellence. Xtreme Gaming, by contrast, has limited International Group Stage history at this scale; Chinese regional dominance does not consistently translate to the broader competitive environment. Historical data from esports prediction markets shows that established champions maintain a 65–72% win rate against regional specialists in opening matches, suggesting the current 63% probability sits slightly conservative.

Traders should monitor roster stability announcements and scrim results in the week preceding the match, as last-minute substitutions or injury disclosures could shift the odds materially. Patch notes released by Valve in early August will also influence hero pool viability for both teams. The settlement window closes at 13:00 UTC on match day; delays beyond seven days trigger a 50-50 resolution, creating tail risk for positions held through extended scheduling disruptions. USDC settlement occurs post-match confirmation on the btc-prediction.bet platform.

Methodology

This page reads Dota 2: Team Spirit vs Xtreme Gaming (BO3) - The International Group Stage 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.

Can I use Bitcoin directly?

No, Polymarket operates exclusively in USDC on Polygon. You can bridge BTC to USDC via an exchange or bridge service and deposit on Polygon — typically 10-30 minutes processing time.

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%.