Monetizing AI APIs presents unique challenges, particularly in determining the best metric for charging users, such as per API call or based on token usage. Moesif offers a Billing Meter feature to facilitate this process by aggregating API usage data per subscription and integrating with billing providers like Stripe or Chargebee for accurate charging. The platform allows developers to set up custom filters and metrics to track specific API usage, ensuring precise monetization. By following a structured setup process, including integrating APIs and configuring billing providers, developers can effectively monitor and monetize their AI APIs, unlocking revenue potential through informed usage tracking.