Retention is a crucial metric for platform businesses, particularly for APIs, as it measures the percentage of users who continue to interact with the product after initial use. Effective retention strategies involve accurately measuring this metric by segmenting users into cohorts based on their integration date and tracking their activity over time. A good retention curve is characterized by a flat or slightly increasing trend, indicating that users find value in the API and continue to use it. To improve retention, it's important to identify and address factors contributing to user drop-off, such as technical issues or localization challenges. Defining clear initial and returning actions for users can aid in accurately assessing retention. Tools like Moesif API Analytics can help organizations track these metrics, providing insights into the health of their API program and guiding data-driven improvements.