Can a CRM Portal user(contacts with web roles) have access Dynamics 365 CRM Services / WebAPI

Hi

Is there any possibility that a CRM Portal User with valid WebRole could have access to CRM Services / WebAPI.

I need this CRM Portal User to be able to fetch/retrieve CRM data (as per the WebRole assigned to the user) through the CRM Services / Web API using custom C# or JavaScript code.

Would appreciate any help on this.