“Microservice APIs” by José Haro Peralta is a book that covers the concepts and practical implementation of microservice-based architectures for developing APIs. The book covers a wide range of topics, including:

1. Introduction to microservices: The book covers the basic concepts of microservices and how they differ from monolithic architectures.
2. Designing microservices: The book covers how to design microservices, including service boundaries, domain-driven design, and API design.
3. Building microservices: The book covers how to build microservices using popular technologies like Flask, Django, and FastAPI.
4. Deploying microservices: The book covers how to deploy microservices using Docker and Kubernetes.
5. Testing microservices: The book covers testing microservices, including unit testing, integration testing, and end-to-end testing.
6. Monitoring microservices: The book covers how to monitor microservices using tools like Prometheus and Grafana.

Overall, “Microservice APIs” provides a practical guide to designing, building, deploying, and monitoring microservices for developing APIs. It is a valuable resource for developers looking to adopt microservice-based architectures for their projects.