I thought this book provides a useful framework for implementing an api marketplace within the organization, particularly in large organization where we are the central team to decide how different teams come together to build apis to support the larger ecosystem. There is less value for those interested more in individual api design.
The conclusion is actually the best chapter and is worth a read if you can before deciding it is suitable. A lot of materials are not unique (like product mindset, automation, etc.) and often recasted in an api context, but there is still some level of value for someone like myself, whom I consider having fairly broad knowledge.