Bitcoin Up or Down - August 20, 4AM ET

Platform comparison

Market context

This market tracks whether Bitcoin's price on Binance's BTC/USDT pair will close higher than or equal to its opening level during a single one-hour candle beginning at 4AM ET on 20 August 2026. A YES share pays out if the close price meets or exceeds the open; a NO share pays out if the close falls below the open. The crowd has priced this at 100% probability for YES, reflecting either extreme confidence in upward movement or, more likely given the binary nature of hourly price action, a technical mispricing or low liquidity environment.

Hourly Bitcoin candles historically close higher roughly 50–52% of the time across most market conditions, making them near-random events in the absence of scheduled catalysts. The current 100% implied probability is inconsistent with this baseline distribution and suggests either that traders expect a specific bullish announcement or event window, or that the market has attracted insufficient participation to establish a realistic price. Comparable one-hour prediction markets on major exchanges typically settle across a wider range unless there is material news driving directional conviction.

Traders should monitor Binance announcements, US economic data releases, and any Federal Reserve communications scheduled between 4AM and 5AM ET on that date, as these can create directional pressure. Bitcoin's correlation with equity futures and risk sentiment remains relevant; overnight Asian and European trading sessions preceding the 4AM ET window will establish momentum. The settlement window closes at 9AM ET, allowing five hours after candle close for Binance data to finalise before resolution.

Methodology

This page reviews Bitcoin Up or Down - August 20, 4AM 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

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

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.

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.

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%.