Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Kalshi UK) 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 |
|---|---|
| ↑ 2,100 | 100% |
| ↑ 2,050 | 100% |
| ↑ 2,000 | 100% |
| ↑ 1,950 | 100% |
| ↑ 2,150 | 9% |
| ↑ 2,200 | 3% |
| ↑ 2,250 | 2% |
| ↓ 1,900 | 1% |
| ↓ 1,850 | 0% |
| ↓ 1,800 | 0% |
| ↓ 1,750 | 0% |
| ↓ 1,700 | 0% |
| ↓ 1,650 | 0% |
| ↓ 1,600 | 0% |
Market context
Ethereum's price action on 19 August 2026 will determine settlement of this contract, with traders currently pricing a 2% probability of the asset hitting the specified threshold. On Polymarket, this conditional token trades against USDC on Polygon, where the mechanics allow traders to lock in positions weeks or months ahead of the settlement window. The tight probability reflects either an extreme price target or substantial distance from current spot rates; either way, the market has priced in considerable scepticism about the outcome materialising within the specified timeframe.
Historical precedent suggests that single-day price targets in crypto markets rarely materialise unless preceded by major catalyst events or sustained volatility regimes. Ethereum's largest single-day moves—typically 15–25% swings—occur during regulatory announcements, macroeconomic shocks, or protocol upgrades. The 2024–2025 period saw Ethereum range between $1,500 and $4,000 across various market cycles, with August months historically showing lower volatility than spring or autumn periods. A 2% probability implies traders expect either a black-swan event or a price level substantially removed from consensus expectations.
Traders monitoring this contract should track Ethereum's spot price trajectory through July 2026, any scheduled Ethereum Foundation announcements, and broader cryptocurrency market sentiment tied to regulatory developments or macroeconomic data. Bitcoin's price action often precedes Ethereum moves by hours or days, making BTC momentum a leading indicator. Settlement occurs on 20 August 2026 at 04:00 UTC, giving traders a narrow window to assess whether the target has been breached during the prior calendar day's trading sessions across major exchanges.
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.
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%.
Trade What price will Ethereum hit on August 19? on Kalshi UK
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