Bitcoin above … on August 21?

Platform comparison

Market context

This market settles on Bitcoin's Binance BTC/USDT closing price at noon Eastern Time on 21 August 2026, measured via the 1-minute candle. The 100% implied probability reflects either an exceptionally high strike price relative to expected spot levels, or minimal liquidity depth in the order book. Traders holding YES positions have locked in certainty through conditional token mechanics on Polygon, whilst any NO position would require Bitcoin to fall below the specified threshold within that single-minute window—a narrow, volatile measurement point that introduces execution risk distinct from directional conviction.

Historical precedent suggests that single-minute candle settlements at major exchanges create persistent basis between Polymarket pricing and spot reality. During 2021's volatility spikes, noon ET closures on BTC/USDT frequently diverged from 24-hour averages by 2–4%, yet markets pricing such precision events rarely traded below 95% when the strike sat comfortably below consensus price targets. The current 100% reading indicates either the strike is substantially below mid-market estimates, or the market has absorbed minimal trading volume since launch.

Traders should monitor August 2026 macroeconomic calendars—Federal Reserve communications and inflation data releases often drive intraday Bitcoin volatility in the hours surrounding US market opens. Binance's own system status and any scheduled maintenance windows merit checking, as technical interruptions have occasionally delayed candle settlement. The specificity of noon ET also means geopolitical events triggering Asian or European market moves earlier that day could establish momentum, though single-minute reversals remain difficult to predict.

Methodology

This page reviews Bitcoin above … on August 21? 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 Scam?, 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%.