Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
22% | 78% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
22% | 78% | 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 |
|---|---|
| ↑ 2,000 | 22% |
| ↓ 1,800 | 15% |
| ↑ 2,100 | 7% |
| ↑ 2,200 | 3% |
| ↓ 1,700 | 2% |
| ↓ 1,600 | 2% |
| ↑ 2,300 | 1% |
| ↑ 2,600 | 0% |
| ↑ 2,500 | 0% |
| ↑ 2,400 | 0% |
| ↓ 1,500 | 0% |
| ↓ 1,400 | 0% |
| ↓ 1,300 | 0% |
| ↓ 1,200 | 0% |
Market context
Ethereum's price action during the week of 10–16 August 2026 will depend on macro Bitcoin correlation, on-chain settlement demand for USDC, and spot exchange liquidity conditions. The contract settles on 17 August against the highest price Ethereum reaches during that seven-day window. Current funding rates and whale accumulation patterns on major exchanges will signal conviction ahead of the settlement period; elevated positive funding typically reflects leveraged longs positioning for volatility, whilst large spot withdrawals suggest institutional accumulation or hedging activity.
Historical precedent shows that Ethereum's weekly price ranges have compressed during low-volatility macro environments and expanded sharply when Bitcoin faces regulatory announcements or Federal Reserve communications. In August 2023, Ethereum traded a $400 range over a comparable week amid sideways Bitcoin price action. The 0% crowd probability suggests the market has priced in either a narrow expected range or significant uncertainty about which price level the contract targets—critical information that hinges on the specific strike price not disclosed in this framing.
Traders should monitor Ethereum's correlation coefficient with Bitcoin throughout early August, as sustained divergence often precedes altseason rallies. Scheduled Ethereum network upgrades, major stablecoin issuance announcements, or shifts in USDC redemption flows could trigger spot demand spikes. Exchange data from Glassnode and CryptoQuant will reveal whether large holders are accumulating or distributing ahead of the settlement window, providing directional bias for price discovery.
Methodology
Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.
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
- Why USDC and not ETH or USDT?
- USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.
- 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%.
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