Bitcoin above … on August 19?

Platform comparison

Market context

The market prices Bitcoin's noon ET close on 19 August 2026 above a specified threshold, with the crowd assigning certainty to the affirmative. Settlement hinges on the Binance BTC/USDT 1-minute candle at 12:00 Eastern Time, making this a precise intraday snapshot rather than a daily close or longer-period aggregate. The 100% implied probability reflects either an extremely low strike price relative to current spot levels, or a structural assumption that Bitcoin will remain above a historically modest floor by that date.

Bitcoin's intraday volatility at specific clock times has historically ranged between 2–5% on ordinary trading days, though this varies sharply with macro announcements or geopolitical events. A noon ET resolution window carries no particular seasonal or scheduled catalyst; the time falls outside major US market opens or closes. For context, Bitcoin's 12-month realised volatility has typically sat between 40–70% annualised, but single-candle moves of 1–2% are routine noise. The certainty priced here suggests the strike is set well below any plausible intraday low, or that the market is treating this as a near-certain event given the two-year horizon to August 2026.

Traders should monitor Federal Reserve policy signals and broader macroeconomic data releases scheduled near mid-August 2026, as these can drive correlated moves across risk assets. Bitcoin's correlation with equity indices and USD strength has strengthened during periods of monetary tightening. Any major regulatory announcement from the SEC or international bodies could shift intraday volatility patterns, though the 100% pricing suggests the market has already priced in a wide margin of safety.

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%.