Our Web Service can act as an API, though it's not a traditional API. You cannot send a query and pull down pages of information.
Our Web Service was written to be the back end to a website, and most of the bibliographic queries will return one title per hit. Some of the more generic bibliographic queries can return up to 25 records per hit, and then you would send another query for the next 25, and so on. Stock queries will also return 25 records at a time.
For further information, please review our Web Service section on this site, or contact the Data Services team: data.services@ingramcontent.com.