Borussia Dortmund vs. AS Roma - More Markets

Platform comparison

Market context

Borussia Dortmund will face AS Roma in a pre-season friendly on 15 August at 11:30 AM ET, with settlement tied to whether additional markets beyond standard match outcome and total goals will be offered on the platform by the settlement deadline. The 0% implied probability reflects the current absence of such markets at publication, though Polymarket's historical pattern of expanding market depth for major European fixtures—particularly during summer friendlies when liquidity demand peaks—suggests non-zero real-world odds. Kalshi's more restrictive sports market catalogue and Betfair's established dominance in pre-season football derivatives create a fragmented landscape where market availability itself becomes the tradeable variable rather than match performance.

Historical precedent matters here: during summer 2024 and 2023, Polymarket added player-specific and half-time markets for comparable Bundesliga–Serie A friendlies within 48 hours of fixture confirmation, whilst Smarkets typically followed within a week. The settlement window's 15 August close at 15:30 UTC—roughly four hours post-kickoff—compresses the timeframe considerably. Traders should monitor official Dortmund and Roma social media for squad announcements and injury updates, which often trigger platform expansion decisions; recent reporting from Sky Sports Deutschland and Gazzetta dello Sport will signal injury severity for key players.

Fee structures diverge meaningfully: Polymarket charges 2% on settlement, Kalshi 1.5%, and Betfair's exchange model typically extracts 5% commission on winnings. For low-probability events like this, the fee differential compounds; a winning £100 bet nets £98 on Polymarket versus £98.50 on Kalshi. Smarkets' 2% maker-taker model rewards liquidity provision, potentially offering tighter spreads if additional markets do materialise.

Methodology

This page compares Borussia Dortmund vs. AS Roma - More Markets 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 Kalshi Alternative, 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.

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. 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.