Product-led growth emphasizes creating exceptional user experiences by leveraging APIs, which are crucial for modern software to facilitate integrations, automation, and data exchange. APIs play a foundational role in product-led growth strategies, impacting user experiences through seamless interactions between applications. For instance, APIs in SaaS platforms like Stripe enable businesses to integrate essential services like payments without extensive infrastructure, reducing time-to-market and enhancing customer satisfaction. Effective API management requires understanding key metrics such as adoption rate, retention rate, latency, error rate, and revenue attribution, which help align technical performance with business goals. Tools like Moesif, Postman, and Datadog offer varying levels of API analytics, from detailed user interaction data to monitoring uptime and latency. By tracking these metrics, businesses can optimize their APIs, enhance developer experiences, and drive revenue growth through strategic API monetization. Aligning API metrics with business objectives, mapping them to user journeys, and setting KPIs are essential steps to ensure product-led growth, supported by real-time insights and feedback loops.