The PlanetScale API is a new way to manage PlanetScale databases programmatically, allowing users to interact with their databases through automation and developer tools. The API enables tasks like updating and creating databases, managing deploy requests, and connecting to PlanetScale branches. OAuth applications are also being launched in limited beta, enabling seamless integration of PlanetScale with external platforms. Users can create service tokens, fill out request parameters, and copy and paste code directly from the documentation to start using the API. The API is designed to empower users to automate processes and create powerful workflows that drive faster and richer developer experiences with PlanetScale.