Systems and methods are provided for interacting with an Application Programming Interface (API) using a digital signature. In one embodiment, a system comprises one or more processors that execute the instructions to perform operations. The operations comprise receiving a digital signature from a requesting device, the digital signature comprising an array of one or more bits, wherein each position in the array is associated with a field in the database and with the data stored in the field of an API; identifying one or more requested fields; accessing the database to retrieve the information associated with the one or more requested fields, the information being associated with at least one API; and providing instructions to the requesting device, based on the retrieved information, causing the requesting application to use the API.