Bitcoin Up or Down - August 20, 5AM ET

Platform comparison

Market context

This market settles on whether Bitcoin's price on Binance's BTC/USDT pair closes at or above its opening level during the one-hour candle beginning 20 August 2026 at 5AM ET. The resolution hinges on a single hourly bar's open and close values, making it a straightforward intraday volatility play rather than directional exposure. For traders automating position entry via conditional orders or bot logic, the key operational detail is that Binance's candle data finalises at the hour boundary, with settlement occurring five hours later at 10AM ET on the same date.

The 100% implied probability reflects a structural quirk common in short-dated, low-liquidity prediction markets rather than genuine certainty about Bitcoin's hourly movement. Historically, single-hour candles exhibit near-random walk behaviour when examined in isolation—roughly 50% close above open across large sample sizes. Markets this tight typically indicate sparse liquidity and minimal trading activity, meaning early positions can skew probabilities dramatically. Comparable one-hour Bitcoin markets on prediction platforms show probability drift driven by order flow rather than new information, particularly when settlement windows remain years away and participants are sparse.

Traders monitoring this market should track Binance's scheduled maintenance windows and any flash crashes or liquidation cascades that could spike volatility during the target hour. Broader Bitcoin catalysts—regulatory announcements, macroeconomic data releases, or major exchange movements—matter less for a single hourly candle than localised order book dynamics. For programmatic traders, querying Binance's API at the candle close (5:59:59 UTC equivalent) provides the definitive settlement values before the market's 10AM ET resolution window.

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Review UK, which mirrors the Polymarket order book directly.

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 Polymarket Review 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%.