Bitcoin price on May 28?

Platform comparison

Active sub-markets

Market context

Bitcoin's spot price at noon ET on 28 May 2026 will determine this market's resolution, with settlement tied to the Binance BTC/USDT 1-minute candle close at that precise moment. The 0% crowd probability reflects either extreme confidence in a specific price bracket or minimal trading activity; Polymarket's current odds display differs markedly from Kalshi's decimal format, which can obscure whether low probability reflects genuine conviction or thin liquidity. Betfair and Smarkets typically show higher participation on major crypto pairs, yet this specific timestamp—a single noon reading rather than daily close—narrows the addressable market considerably.

Historical Bitcoin price movements over comparable 18-month windows show volatility ranging from 40% to 200% annualised, though the 2024–2026 period has seen institutional adoption reduce intraday swings relative to earlier cycles. Traders should monitor Federal Reserve policy announcements, spot ETF flows, and any major regulatory shifts in the US or EU, as these have historically moved Bitcoin 3–8% within hours. The Binance data feed itself carries operational risk; exchange downtime or data anomalies have occasionally forced alternative resolution sources on competing platforms, though Polymarket's reliance on Binance directly differs from some rivals' use of aggregated indices.

Fee structures matter here: Polymarket's 2% taker fee and Kalshi's variable commission both compress expected value on a market with wide brackets and uncertain liquidity depth. The settlement window's specificity—a single 1-minute candle rather than a daily average—makes this sensitive to flash movements and order-book depth at precisely 12:00 ET.

Methodology

This page compares Bitcoin price on May 28? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Alternative, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket Alternative is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

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.

What does it cost to trade on Polymarket Alternative?

Zero. Polymarket Alternative routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.