Bitcoin Up or Down on August 11?

Platform comparison

Market context

Polymarket is pricing a 28% probability that Bitcoin closes higher on 11 August 2026 than it did at noon ET the previous day. The contract settles against Binance's BTC/USDT 1-minute candle closes at the noon ET mark on both dates, with settlement finalised at 16:00 UTC on 11 August. Traders are effectively betting on intraday directional movement across a 24-hour window, a timeframe where Bitcoin's volatility typically ranges between 2–4% based on recent trading patterns.

Historical precedent suggests single-day Bitcoin price movements of this magnitude occur regularly but remain difficult to predict with precision. Over the past two years, roughly 45% of consecutive noon-to-noon candles have closed higher, indicating near-random distribution around the 50% baseline. The current 28% YES probability reflects bearish positioning, suggesting the market expects headwinds or consolidation rather than upward momentum. This skew is notable given Bitcoin's tendency to trade sideways during summer months when institutional volume contracts.

Traders should monitor macroeconomic data releases scheduled for 11 August, particularly any US inflation or employment figures that could trigger broader risk-asset repositioning. Federal Reserve communications and movements in the US dollar index historically correlate with Bitcoin's intraday direction. Additionally, any significant cryptocurrency exchange announcements or regulatory developments could shift sentiment within the 24-hour settlement window. On-chain metrics like exchange inflows and whale wallet activity remain secondary drivers for such short-term moves, though they merit observation for directional bias.

Methodology

This page reviews Bitcoin Up or Down on August 11? 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 Kalshi 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

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 Kalshi 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%.