Application Programming Interface

An API (Application Programming Interface) is a contract between two software systems: it specifies the requests one program can make to another: what endpoints exist, what parameters they accept, and what data or actions they return. When you check the weather in an app, book a flight, or log in with your Google account, APIs are quietly moving data between services behind the scenes. APIs are built primarily for developers, who write custom code against each API's specific structure and authentication. This is the key distinction from a Model Context Protocol server: an API is how software talks to software, requiring a developer to integrate each one by hand, whereas an MCP server wraps capabilities (frequently the same underlying APIs) in a standardized, self-describing interface that an AI model can discover and call on its own. In the AI visibility context, APIs matter in two ways: they are how platforms like Genezio deliver structured data and metrics to your own systems, and they are the raw integration layer that AI agents ultimately reach, directly or through MCP, when they fetch live information about your brand. Exposing clean, well-documented APIs makes your data easier for both developers and AI systems to consume accurately.