Cardinals vs. Raiders

Platform comparison

Market context

The Arizona Cardinals face the Las Vegas Raiders in a preseason National Football League fixture on 13 August at 8:00 PM Eastern Time. The 78% implied probability favouring a Cardinals victory reflects their recent regular-season performance and roster depth relative to the Raiders, though preseason contests carry inherent volatility. Across major platforms, this probability translates to roughly 3.5 decimal odds on Polymarket and Kalshi, whilst traditional sportsbooks like Betfair and Smarkets typically quote tighter spreads given their established liquidity pools. The settlement mechanism here diverges notably: Polymarket operates without KYC requirements for US traders, whereas Kalshi enforces full identity verification, a structural difference that can affect order flow and price discovery on lower-liquidity events.

Historical preseason matchups between these franchises show Cardinals victories in three of the last four meetings, though such records carry limited predictive weight given roster turnover and coaching adjustments. The Raiders' recent offensive line injuries and secondary depth concerns, documented in training camp reports through late July, have likely anchored the current probability. Conversely, the Cardinals' acquisition of proven defensive talent during the off-season strengthens their preseason positioning.

Traders should monitor injury reports released 48 hours before kickoff, as preseason rosters often feature significant absences among star players. Coaching decisions regarding starter participation—particularly for Arizona's quarterback and Las Vegas's defensive starters—will move markets materially. Fee structures differ across platforms: Polymarket charges 2% on both sides, whilst Kalshi's 2% taker fee and Betfair's variable commission create different cost bases for position sizing.

Methodology

This page compares Cardinals vs. Raiders 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

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.

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.

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.