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

Platform comparison

Market context

Aurora and GamerLegion will compete in a best-of-three Dota 2 match during The International's group stage on 13 August at 1:00 AM ET. The market currently reflects 74% implied probability for Aurora victory across most major platforms, though decimal odds representations differ: Polymarket displays this as approximately 3.85, whilst Kalshi and Betfair show 1.35 and similar fractional equivalents respectively. Settlement occurs at 2026-08-13T12:10:00Z, providing a narrow window after the scheduled start time.

Aurora's recent form and roster stability offer historical grounding for the current probability skew. The team has maintained stronger qualification metrics and consistent LAN performance compared to GamerLegion's more volatile results in regional qualifiers. Previous International group stage matchups between similarly-ranked teams suggest that 70–75% probability ranges typically reflect genuine skill differentials rather than market overconfidence, though upsets remain material at roughly one-in-four odds.

Traders should monitor schedule confirmations and any last-minute roster changes, particularly given The International's compressed format. Patch notes released before the event window could alter hero viability calculations that favour one team's strategic depth. Kalshi's stricter KYC requirements may limit participation from certain regions, potentially affecting liquidity compared to Polymarket's broader access, whilst Betfair's commission structure (5% on net winnings) differs from Polymarket's fee model and should factor into expected value calculations for positions held through settlement.

Methodology

We read Dota 2: Aurora vs GamerLegion (BO3) - The International Group Stage from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.