Bitcoin Up or Down - August 20, 5AM ET

Platform comparison

Market context

This market settles based on whether Bitcoin's price on Binance (BTC/USDT pair) closes higher than or equal to where it opened during a specific one-hour window on 20 August 2026, starting at 5AM Eastern Time. A YES share pays out if the close price meets or exceeds the open price; a NO share pays out if the close falls below the open. The crowd has assigned this outcome a 100% implied probability, suggesting near-certainty among traders that the hourly candle will close flat or in positive territory.

Hourly Bitcoin price movements historically exhibit substantial volatility, with single-hour candles closing higher roughly 50–52% of the time across extended periods. The current 100% probability reflects either an extreme conviction that specific catalysts will drive upward momentum during that window, or potentially illiquidity in the market itself. Comparable one-hour prediction markets on major cryptocurrency exchanges show that when probabilities reach such extremes, they often signal either very recent price momentum or thin order books rather than genuine certainty about directional movement.

Traders monitoring this market should track macroeconomic data releases scheduled for 20 August 2026, Federal Reserve communications, and any significant cryptocurrency regulatory announcements in the days preceding settlement. Bitcoin's intraday volatility typically intensifies around major US economic data releases or central bank statements. The five-hour settlement window (ending 10AM ET) also captures the overlap between Asian and European market sessions, periods when trading volume and price swings can accelerate substantially.

Methodology

This page reviews Bitcoin Up or Down - August 20, 5AM ET across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Prediction Market UK, which mirrors the Polymarket order book at 0% fees.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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%.