Lions vs. Bengals

Platform comparison

Market context

The Detroit Lions face the Cincinnati Bengals on 13 August at 7:00 PM ET in an NFL preseason matchup. The current 10% implied probability for a Lions victory reflects moderate confidence in Cincinnati, though preseason games carry inherent unpredictability. Settlement occurs at 23:00 UTC on the same date, with provisions for postponement (market remains open) or cancellation/tie (50-50 resolution).

Preseason contests historically show wider variance than regular-season play, making historical head-to-head records less predictive. The Lions and Bengals split recent matchups, but preseason rosters differ substantially from September lineups. Across Polymarket, Kalshi, Betfair and Smarkets, decimal odds conversions reveal divergent liquidity pools; Kalshi's regulated US framework and Polymarket's offshore model produce different fee structures (typically 2–5% on Kalshi versus variable AMM spreads on Polymarket), which compress or widen the gap between 10% and competing books' offerings. Betfair's exchange model often reflects sharper consensus, whilst Smarkets' lower volume can create wider bid-ask spreads on niche preseason events.

Key catalysts include injury announcements to starting quarterbacks or defensive starters in the days before kickoff, which Smarkets and Betfair typically reprice faster than fixed-odds books. Weather forecasts for Detroit on 13 August may favour either team's passing game. Coaching decisions on player rotation—particularly whether Cincinnati deploys its first-string defence—will influence closing odds. Monitor official NFL injury reports and team social media from 11–13 August; preseason roster churn often triggers late-market movement that fixed-odds platforms lag behind exchange-based venues in capturing.

Methodology

This page compares Lions vs. Bengals 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

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

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

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 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.