Which party will gain most seats in Russian Parliamentary Election?

Platform comparison

Market context

Russia will hold its next State Duma election on 18–20 September 2026, at stake 450 seats in the lower house of parliament. The market asks which party gains the most seats compared to before the election, with United Russia (YeR) currently leading polls at 46.1% and projected to win 231 seats[1]. The 2% implied probability reflects the near-certainty that YeR, already dominant, will not be the party gaining the most seats relative to its pre-election baseline, as historical patterns show incumbents in Russia rarely achieve large net gains in parliamentary seats during non-presidential cycles[3][10].

Traders should monitor shifts in support for New People, the only party showing potential growth since 2021, and watch for Kremlin adjustments to single-mandate constituency boundaries that could alter seat distribution[2][6]. Recent polling divergence between VCIOM (13.4% for New People) and FOM (6%) highlights uncertainty in the field[2]. On platform mechanics, Polymarket displays decimal odds while Kalshi and Betfair emphasise implied probability; fee structures vary from 0–2% on Polymarket to higher charges on Betfair, and KYC requirements differ significantly, with Kalshi mandating US residency while Smarkets allows global access[1][2].

The settlement window closes 20 September 2026, with definitive results required by 30 September 2027 to avoid an "Other" resolution[3]. In a tie for most seats gained, the party with more valid votes wins, adding another layer of complexity to the outcome[3]. Current data suggests the race will centre on whether New People can outperform YeR’s marginal gains, a scenario still considered unlikely given YeR’s entrenched dominance and the structural advantages of the Kremlin’s electoral management[1][4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Which party will gain most seats in Russian Parliamentary Election? 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

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. 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.