Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Prediction Today) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| December 31, 2026 | 100% |
| September 30, 2026 | 99% |
| August 31, 2026 | 98% |
| May 31, 2026 | 0% |
| August 31 | 0% |
| December 31 | 0% |
| October 31 | 0% |
| July 31, 2026 | 0% |
| September 30 | 0% |
| July 19, 2026 | 0% |
| August 15, 2026 | 0% |
| November 30 | 0% |
| March 31, 2026 | 0% |
| January 31, 2026 | 0% |
| February 28, 2026 | 0% |
| June 30, 2026 | 0% |
| April 30, 2026 | 0% |
Market context
Russian forces have made incremental territorial gains in eastern Ukraine's Donetsk region over recent weeks, though the pace of advance has slowed considerably since autumn 2024. Kostyantynivka, a city of roughly 70,000 people located approximately 25–30 kilometres west of the current front line near Pokrovsk, remains under Ukrainian control with no immediate Russian breakthrough in its direction. The 0% implied probability reflects the substantial distance between Russian positions and the city, combined with the defensive infrastructure Ukraine has constructed along this sector.
Historical precedent suggests that Russian territorial captures in this region occur through grinding attrition rather than sudden encirclement. The advance on Mariupol took months despite overwhelming force concentration; Sievierodonetsk fell only after weeks of street-by-street fighting. Kostyantynivka's distance from active combat zones and its status as a secondary rather than primary Russian objective mean the conditions for rapid capture—concentrated assault forces, Ukrainian defensive collapse, or major tactical surprise—remain absent. The 2025 calendar year provides ample time for circumstances to shift, yet current force distributions and logistical constraints make year-end capture unlikely without fundamental changes to the conflict's trajectory.
Traders should monitor Russian offensive announcements targeting the Pokrovsk direction, any major Ukrainian defensive withdrawals, and winter weather effects on ground operations. Recent reporting from Reuters and AFP indicates Russian focus remains on Kurakhove and Velyka Novosilka to the south rather than northwestward advances. Significant shifts in NATO military aid commitments or Ukrainian force redeployment would constitute material catalysts for reassessing this probability.
Methodology
This page reviews Will Russia capture Kostyantynivka by 2025? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Prediction Today, which mirrors the Polymarket order book at 0% fees.
Resolution & payout
Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.
Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.
UK Frequently Asked Questions
- 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 Prediction Today. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.
- How does resolution work?
- Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.
- Is Polymarket legal in the UK?
- Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.
- Do I pay tax on prediction market profits in the UK?
- UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.
- How do I deposit on Polymarket from the UK?
- UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.
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