Bitcoin Up or Down - August 21, 2AM ET

Platform comparison

Market context

The market currently reflects a 100% implied probability that Bitcoin's price at the close of the 1-hour candle beginning 21 August 2AM ET will be at or above its opening level on that same candle. This represents an extreme consensus that the hourly close will not fall below the open—a proposition that carries meaningful execution risk given Bitcoin's typical intraday volatility. The settlement hinges on Binance's BTC/USDT pair data, with the close and open prices taken directly from the 1H candle display once finalised.

Hourly Bitcoin price movements historically cluster around 0.5–2% swings in either direction during low-volatility periods, though this varies substantially with broader market conditions. A 100% probability on a directional hourly move is statistically unusual; comparable markets on similar timeframes typically price directional outcomes between 45–55% when no specific catalyst is present. The extreme skew here suggests either significant accumulated position imbalance on the YES side or a misalignment between the market's pricing and historical frequency distributions for such short-window moves.

Traders monitoring this contract should track macroeconomic data releases scheduled for 21 August, particularly any US economic announcements that could trigger broader risk-asset repricing in the hours surrounding the 2AM ET window. Bitcoin's correlation with equity futures during overnight sessions remains material. Additionally, any significant movement in Ethereum or altcoin pairs on Binance during the preceding hours could establish momentum that carries into the settlement window, though such effects remain probabilistically modest over single hourly candles.

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 Kalshi 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

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%.