A CFTC-designated exchange for event contracts, settled in dollars against named sources.
Per-trade feeOpen to US
Kalshi
4 products in the catalogue, each on its own card. One vendor, several products, because a merged card could not be compared or priced: the halves have different buyers and different competitors.
REST, WebSocket and FIX access to a CFTC-regulated event exchange.
Per-trade feeFree tierOpen to US
Kalshi's current official Python client - weekly releases, Python 3.13 only, no source.
FreeOpen to US
Kalshi's own generated Python client - closed-source, and unreleased since September 2025.
FreeOpen to US