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 resolution, using the 1-minute candle close from Binance's BTC/USDT pair. The settlement mechanism is precise: traders need the exact noon ET close price, not an average or daily open, which makes this useful for testing conditional order logic or webhook-triggered alerts tied to specific exchange data feeds. The 0% crowd probability suggests either extreme confidence in a particular price bracket or insufficient liquidity in the YES category, a signal worth examining before deploying capital.

Historical Bitcoin price movements over comparable 18-month horizons show volatility clustering around macroeconomic events and Federal Reserve policy shifts. Between August 2022 and February 2024, BTC ranged from roughly $19,000 to $52,000—a 173% swing—driven primarily by inflation data releases and interest rate guidance. The current timeframe extends into late 2026, when several rate-sensitive catalysts converge: potential US fiscal policy changes following the 2024 election cycle, ongoing central bank digital currency rollouts affecting stablecoin demand, and Bitcoin's fourth halving (scheduled April 2024, affecting mining economics through 2026). Traders should monitor quarterly CPI prints, Fed meeting minutes, and any regulatory announcements from the SEC regarding spot Bitcoin ETF frameworks, as these historically correlate with directional moves.

For programmatic approaches, this market rewards automation that ingests Binance candle data directly via API, filters for the exact 12:00 ET timestamp, and cross-references against historical volatility bands. Setting conditional orders keyed to macroeconomic calendar events—particularly those affecting USD strength—provides an edge over static price predictions.

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

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 Bot 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%.