Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Who Will Win) Pick polygram.ink (preferred broker) |
83% | 17% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
83% | 17% | 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 |
|---|---|
| Crowley 0.4–0.6% | 83% |
| Other | 50% |
| Crowley 0.2–0.4% | 17% |
| Crowley 0.6–0.8% | 4% |
| Crowley <0.2% | 3% |
| Crowley 0.8–1% | 2% |
| Crowley 1–1.2% | 1% |
| Hong 1%+ | 0% |
| Hong 0.8–1% | 0% |
| Hong 0.6–0.8% | 0% |
| Hong 0.4–0.6% | 0% |
| Hong 0.2–0.4% | 0% |
| Hong <0.2% | 0% |
| Crowley 1.2–1.4% | 0% |
| Crowley 1.4–1.6% | 0% |
| Crowley 1.6–1.8% | 0% |
| Crowley 1.8–2% | 0% |
| Crowley 2%+ | 0% |
Market context
Wisconsin's Democratic primary for governor takes place on 11 August 2026, with the winner determined by the margin separating first and second place. The 0% implied probability suggests the crowd expects a decisive outcome—either a landslide victory or a result falling outside the 0.2% bracket thresholds entirely. Current Democratic frontrunner status remains unclear given the absence of declared candidates and recent polling data, making this market's settlement dependent on late-stage primary dynamics and candidate emergence over the next eighteen months.
Wisconsin Democratic gubernatorial primaries have historically produced mixed results. The 2022 cycle saw Tony Evers secure renomination with substantial support, though primary margins in competitive open-seat races often narrow considerably. The state's Democratic base spans Milwaukee's urban core, Madison's college-educated voters, and scattered rural strongholds, creating conditions where margins can compress if multiple credible candidates enter the field. Comparable Midwestern Democratic primaries—particularly Illinois and Michigan—have shown that well-funded challengers can close gaps in the final weeks, suggesting current consensus around a blowout may underestimate late consolidation dynamics.
Key triggers include formal candidate announcements (likely autumn 2025 onwards), union endorsements, and fundraising disclosures that typically reshape primary trajectories. Wisconsin's August primary date compresses the general election timeline, potentially influencing candidate decisions about resource allocation. Recent Democratic messaging around abortion access and healthcare—salient issues post-Dobbs—will shape which candidates gain traction. Traders should monitor whether a single establishment-backed candidate emerges or whether the field fragments, as fragmentation directly correlates with tighter margins.
Methodology
We track Wisconsin Governor Democratic Primary Margin of Victory (0.2% Brackets) across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.
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.
UK Frequently Asked Questions
- 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.
- 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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