What price will Bitcoin hit on May 31?

Platform comparison

Active sub-markets

Market context

Bitcoin's price trajectory over the final month of May 2026 will depend on macroeconomic conditions, regulatory announcements, and institutional positioning in the months leading up to settlement. The 0% crowd probability on this market reflects either extreme confidence in a specific price range or sparse liquidity; across Polymarket, Kalshi, and Betfair, such extreme readings often signal thin order books rather than genuine consensus. Kalshi's regulated US framework and KYC requirements typically attract institutional traders who move markets on fundamental shifts, whilst Polymarket's international reach and lower friction onboarding can amplify retail positioning on speculative outcomes. Decimal odds on Betfair and Smarkets would express this market's current state differently—a 1.01 decimal implies near-certainty, whereas Kalshi's binary YES/NO structure makes the absence of YES orders more visually stark.

Historical precedent suggests Bitcoin's monthly price ranges have compressed during low-volatility periods and expanded sharply around Federal Reserve decisions, spot ETF milestones, and geopolitical risk events. May 2024 saw Bitcoin trade within a $5,000 band; similar consolidation in May 2026 would narrow the settlement window considerably. Traders should monitor first-quarter 2026 inflation data, any US regulatory guidance on crypto custody standards, and corporate earnings calls that signal institutional appetite for digital assets. The settlement window extends to June 2026, giving traders a full month after May closes to assess whether the market's current zero probability reflects genuine price certainty or merely illiquidity waiting for catalyst clarity.

Methodology

This page compares What price will Bitcoin hit on May 31? 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 Kalshi Alternative UK, 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 Kalshi 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.

Is this market available outside the US?

Kalshi Alternative UK 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 does it cost to trade on Kalshi Alternative UK?

Zero. Kalshi 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 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.