This section contains information pertaining to user authentication and entitlement within the Margin Service API.
To initiate a session with CORE's API, the client must make a request passing in the
password parameters within the HTTP request headers. These credentials must be a valid CME Group Login or API ID.
Upon successful login, the Margin Service API will return a session ID in the
sessionId HTTP response header.
Entitlement for API calls are determined by the CME Group API ID used for authentication and by completing a standard API license with CME. To create a new API ID, create a login at
Entitlements are provisioned by CME CORE system administrators. Entitlement management is not available through the Margin Service API.