Bitcoin price on August 21?

Platform comparison

Market context

Bitcoin's spot price at noon ET on 21 August 2026 will determine this market's outcome, with settlement tied to the Binance BTC/USDT 1-minute candle close at that precise moment. The 0% crowd probability suggests either extreme confidence in a specific price bracket or minimal liquidity; traders automating conditional orders around this date should note that the noon ET timestamp creates a fixed reference point suitable for bot-triggered executions, though Binance's 1-minute candle data requires live API polling rather than delayed feeds.

Historical Bitcoin price volatility over comparable 18-month windows shows typical intraday swings of 2–5% around daily closes, with longer-term directional moves driven by macroeconomic cycles, regulatory announcements, and spot ETF flows. The August 2023–February 2025 period saw Bitcoin range from $26,000 to $73,000, illustrating how seasonal factors and institutional positioning can shift baseline expectations across quarters. Traders evaluating this market programmatically should cross-reference historical volatility clustering: summer months have historically shown lower volume and wider spreads, affecting noon-hour liquidity on major exchanges.

Catalysts through mid-2026 include Federal Reserve policy decisions (affecting risk appetite), potential cryptocurrency legislation in major jurisdictions, and Bitcoin's halving cycle dynamics—the next halving occurs in April 2024, with post-halving price discovery typically extending 12–18 months. Recent institutional adoption trends and macroeconomic inflation expectations will shape baseline assumptions. Automated traders should monitor Binance's order-book depth and historical noon ET volume patterns to calibrate slippage expectations for conditional orders placed near the settlement window.

Methodology

We track Bitcoin price on August 21? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 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%.