Bitcoin Up or Down - August 18, 1AM ET

Platform comparison

Market context

This market tracks whether Bitcoin's price on Binance will close higher than or equal to its opening level during a single hour on 18 August 2026, starting at 1AM Eastern Time. A YES share pays out if the close price meets or exceeds the open price; a NO share pays if it closes lower. The settlement uses the official BTC/USDT candle data from Binance's 1-hour chart, finalised once that hour concludes at 2AM ET.

The 100% probability assigned here warrants scrutiny against historical hourly Bitcoin volatility. Over the past five years, single-hour candles closing at or above their open occur roughly 48–52% of the time across major exchanges, depending on market regime. This suggests the crowd probability reflects either an expectation of unusual directional momentum, a liquidity or technical setup favouring upside, or potentially mispricing given the inherent randomness of intra-hour price action. Comparable hourly markets on Bitcoin typically settle closer to 50–50 splits unless there are identifiable catalysts.

Traders monitoring this market should track macroeconomic data releases scheduled for 17–18 August, Federal Reserve communications, and any significant cryptocurrency-specific announcements. Bitcoin's hourly direction is sensitive to spot trading flows, options expiry dynamics, and broader equity market opens. The specific 1AM ET window falls outside US market hours but overlaps with Asian trading sessions, where volume and volatility patterns differ markedly from US hours. No major scheduled events currently anchor expectations for that particular hour, making the extreme probability assignment difficult to justify on fundamental grounds alone.

Methodology

We track Bitcoin Up or Down - August 18, 1AM ET 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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

UK Frequently Asked Questions

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Prediction Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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%.