Bitcoin Up or Down - August 20, 3AM ET

Platform comparison

Market context

This market settles on whether Bitcoin's price on Binance's BTC/USDT pair closes higher than or equal to its opening level during the one-hour candle beginning 20 August 2026 at 3AM ET. The resolution hinges on a single hourly bar's open and close values, making it a straightforward intraday volatility play rather than a directional bet on longer timeframes. Traders automating candle-level strategies would typically pipe Binance's REST API or WebSocket feed directly into conditional order logic, capturing the finalised OHLC data once the candle closes at 4AM ET.

The 0% crowd probability suggests either extreme confidence in a downward move or, more likely, minimal liquidity and participation at this specific timestamp. Historical hourly Bitcoin candles show roughly 50–52% close above open across bull and bear regimes, so a zero probability reflects market thinness rather than a fundamental directional signal. Comparable one-hour settlement markets on major exchanges rarely sustain skewed probabilities unless tied to scheduled announcements or known liquidity events.

Traders monitoring this window should track whether major economic data or Fed communications fall within the preceding hours, as these can establish directional momentum into the 3AM ET slot. Binance's own maintenance windows or significant spot-futures basis shifts could also influence order-flow dynamics. The settlement window closes at 8AM ET, providing a four-hour buffer for data confirmation, though the candle itself finalises at 4AM ET—a critical distinction for bots relying on real-time settlement feeds rather than delayed historical snapshots.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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%.