The United States
The watershed: CFTC-regulated event exchanges (Kalshi, and Polymarket via its regulated US entity) operate legally at the federal level, with economics, politics and weather contracts broadly available. Sports event contracts are the contested frontier — live in many states, challenged in others as tribal and state gaming interests litigate. PredictIt continues under its long-running no-action arrangement. The direction of travel is unmistakably toward regulated legitimacy.
UK, EU and Elsewhere
The UK treats event speculation as gambling: licensed betting operators offer political markets; crypto prediction platforms sit outside the licensed perimeter. EU countries vary by national gambling law, with no unified event-contract framework. Australia prohibits most online event wagering outside licensed bookies. On-chain platforms are globally accessible in the technical sense; local law and platform geo-blocking define the actual boundary — and terms-of-service violations endanger funds.
Practical Questions Before Funding
Three checks: Is the platform regulated (or at least long-established) where it operates? Does it explicitly serve your jurisdiction — not merely fail to block it? How are winnings taxed locally (gambling rules vs capital gains changes your filing materially)? Regulated-where-you-live beats offshore-with-VPN on every axis that matters when something goes wrong.