HomeWizard Energy

HomeWizard's API is exceptionally well-documented and developer-friendly, designed for IoT and smart home integration. It uses local network access with API key authentication, supporting both v1 and v2 protocols.

The API covers energy monitoring, device control, and automation comprehensively. However, it requires purchasing HomeWizard hardware and operates only on local networks.

The API is free once you own the devices, with excellent community support. It's perfect for energy monitoring applications and smart home automation, but limited to HomeWizard's hardware ecosystem.