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.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

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.

Dota 2: BoomBoys vs OG (BO3) - The … | Robinhoodpredictionmarkets 2026

Name: Dota 2: BoomBoys vs OG (BO3) - The International Group Stage
Start: 2026-08-10T08:21:50.000Z
End: 2026-08-13T08:00:00.000Z

Platform comparison

Platform	YES odds	NO odds	Fee	KYC	Settlement
Polymarket (via Robinhood Prediction Markets) Pick polygram.ink (preferred broker)	82%	18%	0% (USDC on-chain)	No-KYC up to $1,500	USDC, auto via UMA oracle	Go to the live market →
Polymarket (direct) polymarket.com	82%	18%	0%	Geo-blocked in US/UK/EU	USDC, on-chain	Go to the live market →
Kalshi kalshi.com	—	—	Up to 7% per trade	US-only, KYC required	USD	Go to the live market →
Betfair Exchange betfair.com	—	—	2-5% commission	Full KYC from first trade	GBP / EUR	Go to the live market →
Manifold Markets manifold.markets	—	—	Play-money (mana)	None — play-money	Mana (no cash-out)	Go to the live market →

Outcome probabilities

Current market-implied probability for each outcome, from the live order book.

Outcome	Probability
Match Winner	82%
Game 1 Winner	80%
Game 2 Winner	69%
Total Kills Over/Under 50.5 in Game 2?	63%
Total Kills Over/Under 50.5 in Game 1?	63%
O/U 2.5 Games	57%
Ends in Daytime	50%
Both Teams Beat Roshan	50%
Both Teams Destroy Barracks	50%
Any Player Ultra Kill	50%
Any Player Rampage	50%
Ends in Daytime	50%
Both Teams Beat Roshan	50%
Both Teams Destroy Barracks	50%
Any Player Ultra Kill	50%
Any Player Rampage	50%
Ends in Daytime	50%
Both Teams Beat Roshan	50%
Both Teams Destroy Barracks	50%
Any Player Ultra Kill	50%
Any Player Rampage	50%
First Blood in Game 2?	50%
First Blood in Game 1?	50%
Total Kills Over/Under 45.5 in Game 1?	50%
Total Kills Over/Under 40.5 in Game 1?	50%
Total Kills Over/Under 35.5 in Game 1?	50%
Total Kills Over/Under 55.5 in Game 1?	38%
Game Handicap: BoomBoys (-1.5) vs OG (+1.5)	30%

Market context

Dota 2: BoomBoys vs OG (BO3) - The International Group Stage — current market-implied probability: 82%. This market refers to the Dota 2 Round 1 match between BoomBoys and OG in the The International Group Stage, initially scheduled for August 12 at 10:00PM ET. This market will resolve to "BoomBoys" if…

Methodology

This page compares Dota 2: BoomBoys vs OG (BO3) - The International Group Stage specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

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.
Which platform is accessible globally?: Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.
Are all these platforms regulated?: No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.
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.

Alex ChenPrediction Market Analystand

Jordan LeeSports Prediction Reporter

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

Platform comparison

Outcome probabilities

Market context

Methodology

Resolution & payout

FAQ

Trade Dota 2: BoomBoys vs OG (BO3) - The International Gro… on Robinhood Prediction Markets

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