should i use demo env or prod env?

[Yvette-0508]

[YichengYang-Ethan]

Demo env is what you want for testing — separate API key from the demo dashboard, no real money.

HOST = "https://demo-api.kalshi.co/trade-api/v2" if DEMO else "https://trading-api.kalshi.com/trade-api/v2"

The two envs issue separate API keys and private keys — make sure the key_id you load matches the env you're hitting, otherwise you'll get 401s. Same code works for both, just toggle the HOST and the credentials path.