These examples use an ACS API Token that you can issue from the ACS Central Integrations page

The examples assume two environment variables:
CENTRAL is the exposed hostname or IP address of the ACS Central pod's route or loadbalancer
ROX_API_TOKEN is the full text of a token created in the Central UI's Integrations page

API calls to ACS' RESTful API endpoints require the API token in the Authorization: Bearer header. The RESTful API documentation is available in the Central UI.

export CENTRAL=central-stackrox.apps.example.com
export ROX_API_TOKEN=eyJhbGciOiJSUzI1NiIsIm...HYkJj2uWo

Absurdly simple example:

curl -k -H "Authorization: Bearer ${ROX_API_TOKEN}" https://$CENTRAL:443/v1/ping