Bitcoin price on May 31?

Platform comparison

Active sub-markets

Market context

Bitcoin's spot price at noon ET on 31 May 2026 will be measured against Binance's 1-minute candle close for BTC/USDT. The market currently shows 0% implied probability on the YES side, suggesting either extreme uncertainty about the settlement mechanism or that traders view the specific price bracket as implausible. Polymarket's decimal odds format and Kalshi's binary structure would display this differently; Kalshi's US-regulated framework may attract domestic traders more readily, whilst Betfair's lay functionality offers alternative hedging mechanics unavailable on Polymarket's order-book model.

Historical Bitcoin volatility over comparable 18-month windows—from late 2024 through mid-2026—provides limited precedent for this exact settlement date, though the 2017–2018 and 2021–2022 cycles show annualised swings of 60–120%. The current 0% reading likely reflects either sparse liquidity in this particular bracket or technical barriers: Polymarket's KYC requirements differ from Smarkets' lighter onboarding, potentially fragmenting the trader base across platforms. Fee structures matter here; Kalshi charges flat commissions whilst Polymarket takes a percentage, affecting edge calculations for longer-dated positions.

Catalysts between now and May 2026 include US Federal Reserve policy shifts, institutional adoption announcements, and regulatory developments—particularly any clarity on spot Bitcoin ETF frameworks in major jurisdictions. Macroeconomic data releases and geopolitical events will drive volatility. Traders should monitor Binance's operational status and any changes to their API or candle-close methodology, as settlement hinges entirely on that single data point at a precise timestamp.

Methodology

We read Bitcoin price on May 31? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

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 UK, 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.

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 does it cost to trade on Polymarket Alternative UK?

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

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.