Monetizing APIs is increasingly important as they become the primary interface for accessing company products, especially in automation and AI-driven workflows, beyond traditional subscription-based models. The process involves transitioning internal APIs to external revenue generators, which can convert costly engineering platforms into revenue centers. However, selling APIs presents challenges as purchasing power has shifted to developers, requiring a developer-first approach to adoption and product-led growth. This involves offering a self-serve onboarding experience and initial low-cost commitments, with sales teams later guiding customers to expand their usage based on data-driven insights. Effective API monetization requires choosing the right consumption metrics, aligning pricing with business value, and adopting appropriate billing, packaging, and invoicing strategies. Usage-based billing models, like Pay As You Go (PAYG), offer potential for revenue growth but demand accurate usage tracking and customer communication to manage expectations.