Retrieve all Kalshi markets for multiple categories at once.
GET /api/v1/klsi/markets/categories?categories=Crypto,SportsX-API-Key: YOUR_API_KEYYour API key (get one from the test-key endpoint above)
Comma-separated list of categories
Maximum number of markets to return (default: 100, max: 1000)
x <= 1000Number of markets to skip for pagination