Your credentials live in your browser's localStorage only — they're sent with each request to this server but never stored on it. To clear them, just clear site data.
Kalshi API Key ID
Settings → API on kalshi.com
Kalshi Private Key (PEM)
The private_key.pem file you downloaded when you created the API key. Paste the full file contents.
the-odds-api.com key (optional)
Used for sports lines. Without it, only the Weather tab works.