The mechanism is straightforward: on 30 September, the Czech Ministry of Finance added Kalshi to its list of unauthorised gambling operators. Under Czech law, that listing triggers a mandatory ISP-blocking obligation. The providers do not get to weigh the merits — the listing is the order.
What makes this worth tracing is what Kalshi actually is. It is a prediction markets exchange in the United States operating under Commodity Futures Trading Commission oversight. The Czech Ministry of Finance has treated it as a gambling operator, full stop, and the list is the enforcement instrument.
The CFTC, according to iGaming Business, has separately sent proposed event contract rules to the White House — a signal that the regulatory categorisation of prediction markets remains genuinely unsettled even in their home jurisdiction. Czech authorities have not waited for that question to resolve. They have their own definition, their own list, and a deadline that is now running.
Whether Kalshi will contest the Czech designation, or whether the ISP blocks will be technically effective, the source does not establish.
Gabriel Fenech
Isla Camilleri
Alexandre Noir
Elena Vella