San Francisco Giants vs. Kansas City Royals

Platform comparison

Market context

The Kansas City Royals defeated the San Francisco Giants 4–3 in their MLB matchup on Monday, 20 July 2026, with Nick Loftin’s ninth-inning squeeze bunt securing the win for Kansas City [1][4]. This result is now final, meaning the prediction market titled “San Francisco Giants vs. Kansas City Royals” has already settled to “Kansas City Royals” in reality, despite the crowd-implied probability of 0% YES for the Giants appearing on the platform. The settlement window ending in 2026 is irrelevant here because the event occurred before today’s date.

Historically, markets that retain open status after a game’s conclusion—often due to delayed data feeds or platform latency—typically resolve to the actual outcome once official statistics are confirmed, as seen in similar MLB disputes where Polymarket and Kalshi diverged on timing but aligned on final resolution [1]. On Polymarket, this market would show 100% probability for the Royals post-game, whereas Kalshi’s decimal odds might lag briefly before adjusting, reflecting differing fee structures and KYC thresholds that affect how quickly retail traders update positions.

Traders should monitor the official final statistics page for MLB to confirm no post-game adjustments, though no such changes are expected for this low-scoring contest [1]. Recent coverage from ESPN confirms the final score and key play, serving as the primary resolution source referenced in the market description [1]. With the game completed, any lingering 0% YES probability for the Giants is a platform artefact, not a reflection of live odds, highlighting how books like Betfair and Smarkets often clear such discrepancies faster than decentralised platforms.

Sources: 1 · 2 · 3 · 4

Methodology

We read San Francisco Giants vs. Kansas City Royals 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.

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. 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.