An API manager, also known as an API administrator or API product manager, is a role within an organization that is responsible for the management and strategy of the Application Programming Interfaces (APIs) offered by the organization. The API manager plays a vital role in defining, developing, deploying and maintaining APIs.

The duties and responsibilities of an API manager can vary depending on the specific needs and size of the organization, but generally include:

1. API Strategy and Planning: The API manager is responsible for setting the strategic direction and objectives related to APIs. This includes understanding the needs of the organization, identifying opportunities for API-based services, and defining a roadmap for API development and implementation.

2. API Design and Specification: The API manager works with development teams and stakeholders to define API specifications and designs. This includes determining the functionality, determining the required endpoints, developing data models, and defining the security and authorization aspects of the APIs.

3. API development and implementation: The API manager works with development teams to ensure that the APIs are developed and implemented according to specifications. This includes coordinating development efforts, testing the APIs, and ensuring the quality and performance of the APIs.

4. API Documentation and Publication: The API Manager is responsible for creating and updating detailed documentation of the APIs, including manuals, examples, and reference materials. This also includes publishing the APIs in an accessible way, such as through an API portal or developer portal.

5. Security and authorization: The API manager is responsible for implementing and managing security measures for the APIs, such as managing API keys, access controls, and user rights. They ensure that the APIs are secure and that access to sensitive data is adequately controlled.

6. Monitoring and Optimization: The API manager monitors the usage and performance of the APIs. They analyze data, monitor API performance, and identify trends or issues. Based on these insights, they can implement optimizations and make improvements to the APIs and associated processes.

The API manager often works closely with cross-functional teams, including developers, system architects, project managers, product managers, and other stakeholders to ensure that APIs are effectively managed and meet the needs of the organization and the developer community.