Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| Ed Case | 100% |
| Jennifer Booker | 0% |
| Ben Fatula | 0% |
| Jarrett Keohokalole | 0% |
| Nicholas Kiswanto | 0% |
| Candidate A | 0% |
| Candidate B | 0% |
| Candidate C | 0% |
| Candidate D | 0% |
| Candidate E | 0% |
| Candidate F | 0% |
| Other | 0% |
Market context
The Democratic nominee for Hawai‘i’s 1st Congressional District was decided in the 8 August primary, and the market’s 0% YES reading means traders are effectively pricing no path to a different winner being recognised after the official result flow. In on-chain terms, the contract should only settle once the designated Democrat sources agree on the nominee, so late count changes matter more than campaign chatter; if a name is still unresolved by the deadline, the market falls back to **Other** under the stated rules.
Recent race data frames why a zero probability is unusual: live election coverage showed **Ed Case** leading **Jarrett Keohokalole** in the district count, with the New York Times reporting Case on 60% to Keohokalole’s 36% at 84% reported, while pre-election market and polling snapshots had the contest closer than that. Comparable Hawai‘i primaries can move materially on absentee and late-arriving ballots, but once a frontrunner opens a clear lead, the settlement risk typically shifts from “who wins?” to “whether the result is formally posted before the market’s resolution window closes.”[8][2][12]
For traders, the main catalysts are the official Hawai‘i election canvass, any nominee certification updates from party or election authorities, and post-primary candidate status changes such as withdrawals or replacements before the market’s November backstop. Because this is a USDC-settled event market, the practical watchlist is less about spot BTC/ETH direction and more about whether broader crypto risk appetite affects liquidity, funding, and offer depth around the contract; if there is a wider market sell-off, thin books can still distort pricing even when the political outcome is already near-determined.
Methodology
This page reads HI-01 Democratic Primary Winner on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.
Resolution & payout
Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.
Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.
UK Frequently Asked Questions
- What are crypto prediction markets?
- Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.
- Can I use Bitcoin directly?
- No, Polymarket operates exclusively in USDC on Polygon. You can bridge BTC to USDC via an exchange or bridge service and deposit on Polygon — typically 10-30 minutes processing time.
- 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%.
Trade HI-01 Democratic Primary Winner on BTC Prediction
Live order book, 0% fees, USDC settlement in seconds.
Open live market →