Clacton by-election Winner

Platform comparison

Market context

Nigel Farage, leader of Reform UK, has announced his resignation as the MP for Clacton, triggering an imminent parliamentary by-election in this coastal Essex constituency. The market currently prices a Reform victory at 95% implied probability, a figure that aligns closely with Electoral Calculus’s 97% forecast for Reform holding the seat following Farage’s 21,225-vote majority in the 2024 general election[1][2].

Historical by-elections in Clacton, such as the 2014 contest where Douglas Carswell won for UKIP, demonstrate the constituency’s susceptibility to insurgent parties, yet the 2024 result established a far more entrenched Reform dominance than previous shifts[3][5]. While sportsbooks and analyst consensus often diverge on volatile by-elections, the 95% market price here shows minimal divergence from the 97% statistical prediction, suggesting the crowd views the outcome as nearly deterministic rather than speculative[1].

Traders should monitor the official announcement of the by-election date from Tendring District Council and any immediate candidate nominations from Reform UK, as delays could push the resolution toward the “Other” outcome if the result is not known by June 2027[6]. Recent reporting from The Independent highlights that the constituency’s history does not guarantee a repeat of 2014, but the sheer scale of Farage’s 2024 margin creates a dependency on Reform’s ability to maintain local organisational strength during the transition[3]. No significant catalysts currently threaten the 95% probability, making the primary risk procedural rather than political.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi vs Polymarket. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.