The Streak API integrates its client relationship management (CRM) platform into other applications like MailChimps and Wufoo. The API's webpage reveals that it requires an API key and uses HTTP Basic Auth. The request format supports Create, retrieve, update, and delete (CRUD) with response in JSON. The purpose of the API is to manage CRM relationships through your application.
FullContact has announced the CardShark API. The CardShark API allows users to "to send images of business cards to FullContact, and...receive back a response containing transcribed structured contact data." The advantage the API method of optical character recognition over competitors lies in the ability to send contacts to devices and applications beyond the device that captured the initial picture.