Dota 2: Nigma Galaxy vs OG (BO3) - The International Group Stage

Platform comparison

Market context

Nigma Galaxy and OG will face each other in a best-of-three Dota 2 match during The International Group Stage on 13 August 2026, with the fixture scheduled for 05:00 ET. The match determines seeding and advancement prospects within the group phase of esports' largest annual tournament. The 100% implied probability reflects either exceptional certainty about one team's dominance or insufficient liquidity depth in the order book; such extremes often signal thin trading volume rather than consensus conviction.

Historical precedent suggests OG enters as favourites given their two International titles (2018, 2019) and consistent top-tier roster construction, whilst Nigma Galaxy—the reformed iteration of Team Liquid's 2017 championship squad—has demonstrated volatility in recent seasons. Comparable group-stage matchups at prior Internationals between established organisations typically resolve within 2–3 map swings, with preparation depth and recent scrim results often outweighing raw historical pedigree. The 100% reading warrants scepticism; markets settling at extremes frequently encounter sharp reversals once additional information surfaces or liquidity providers enter.

Traders should monitor official Valve announcements regarding any schedule adjustments, roster confirmations, or format changes through early August. Recent patch notes and hero pool rotations released before the event window will shape draft strategy and may favour one team's signature heroes. The settlement window closes 13 August at 15:30 UTC, allowing a 10-hour buffer post-match for result confirmation. Any postponement beyond 168 hours from the original 05:00 ET start triggers the 50-50 resolution clause, introducing tail risk for positions held through the settlement deadline.

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

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 does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

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%.