Bitcoin Up or Down - August 20, 4AM ET

Platform comparison

Market context

This market settles on whether Bitcoin's price at 4AM ET on 20 August 2026 closes at or above its opening level during that specific one-hour candle on Binance's BTC/USDT pair. The 100% implied probability reflects a market pricing mechanism rather than certainty about directional movement; such extreme probabilities on hourly price action typically indicate either minimal liquidity depth or a structural quirk in how conditional tokens are valued on Polygon at settlement. Traders holding YES positions are effectively betting the candle doesn't close lower, whilst NO holders require a measurable decline within that 60-minute window.

Hourly Bitcoin candles historically close higher roughly 51–52% of the time across major exchanges, making any single hour marginally bullish by base rates alone. However, the 2026 timeframe sits far enough forward that current volatility regimes offer limited predictive value. The current crowd probability of 100% suggests either the market has collapsed into a liquidity trap where USDC-denominated conditional tokens on Polygon cannot find sufficient depth for realistic pricing, or traders have simply not engaged with this particular contract in meaningful volume.

Catalysts between now and settlement remain unknowable at this distance, though Bitcoin's hourly behaviour typically correlates with US equity futures, Federal Reserve communications, and spot exchange order flow. Traders should monitor whether liquidity actually materialises in the USDC settlement pool as the date approaches; thin markets on Polymarket often see probability collapse or spike dramatically once real capital attempts entry or exit.

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 Polymarket Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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%.