An application programming interface (API) exploration data structure is used in presenting an API composite to a first entity. A query associated with a topic is received from the first entity. A portion of the data structure is accessed. The accessed portion includes nodes that represent entities, nodes that represent APIs, and edges that represent relationships between nodes. A similarity score is calculated for each entity using a comparison to the first entity. Each similarity score is then compared to a threshold. A first network including each entity that has a similarity score above the threshold is generated. An API group including each API that has a relationship with the first network is generated. The API composite is identified based on the topic. As identified, the API composite includes an API of the related API group. The API composite is presented to the first entity.