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.

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 is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative 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.

Houston Astros vs. San Francisco Giants | Kalshi Alternative [77% Yes]

Name: Houston Astros vs. San Francisco Giants
Start: 2026-08-04T13:01:46.000Z
End: 2026-08-18T01:45:00.000Z

Platform comparison

Platform	YES odds	NO odds	Fee	KYC	Settlement
Polymarket (via Kalshi Alternative) Pick polygram.ink (preferred broker)	77%	23%	0% (USDC on-chain)	No-KYC up to $1,500	USDC, auto via UMA oracle	Go to the live market →
Polymarket (direct) polymarket.com	77%	23%	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
1st 5 Innings O/U 2.5	77%
1st 5 Innings O/U 3.5	64%
Houston Astros vs. San Francisco Giants	59%
O/U 7.5	57%
NRFI	52%
1st 5 Innings O/U 4.5	52%
O/U 8.5	49%
Spread -1.5	46%
1st 5 Innings O/U 5.5	40%
O/U 9.5	38%
1st 5 Innings Spread -1.5	35%
Spread -2.5	35%
1st 5 Innings O/U 6.5	28%
Spread -1.5	26%
1st 5 Innings Spread -1.5	25%
Spread -2.5	18%
Extra Innings	8%

Market context

Market consensus: 77% chance of houston astros vs. san francisco giants. Prediction markets aggregate real capital to produce this probability signal. In the upcoming MLB game between the Houston Astros and San Francisco Giants, scheduled for August 10 at 9:45PM ET: This market will resolve to "Houston Astros" if the Houston Ast…

Live Data & Statistics

The Polymarket order book prices 1st 5 Innings O/U 2.5 at 77% for "Houston Astros vs. San Francisco Giants".

1st 5 Innings O/U 2.5 77% Other 23%

Live stats load when the match begins. Current market odds are shown above. Trading volume: $139K.

Methodology

We read Houston Astros vs. San Francisco Giants 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

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.
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 is accessible globally?: Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative 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.

Chris ReedPolitical Forecasting Editorand

Maya TorresFinancial Markets Writer

Trade Houston Astros vs. San Francisco Giants on Kalshi Alternative

Live order book, 0% fees, USDC settlement in seconds.

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Houston Astros vs. San Francisco Giants

Platform comparison

Outcome probabilities

Market context

Live Data & Statistics

Methodology

Resolution & payout

FAQ

Trade Houston Astros vs. San Francisco Giants on Kalshi Alternative

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