Fusio

Fusio is an open-source, self-hosted backend platform and API gateway written in PHP. It allows users to expose internal infrastructure, such as legacy databases and microservices, as scalable API products. The software is deployed as a server application and can be installed via Docker, a web installer, or manual configuration on a server using Nginx or Apache.

The platform provides tools to bridge internal business logic with external consumers. It includes a management backend for configuring API operations and a developer portal for third-party access. Fusio supports the creation of custom backend logic through PHP classes or worker actions in languages like JavaScript and Python, allowing developers to define how the system handles incoming requests and returns responses.

Key features

• Database API Gateway to expose SQL and NoSQL databases as REST APIs
• Microservice Gateway for routing and load-balancing distributed services
• Custom API logic using reusable actions in PHP or Javascript
• Native Model Context Protocol support for AI agent integration
• AI-assisted generation of backend logic and schemas from natural language
• Automated developer portal with documentation and API key management
• Automated generation of client SDKs for multiple programming languages
• API monetization tools including subscription plans and quotas
• Real-time analytics for tracking API usage and performance

Fusio is designed for developers and organizations needing to modernize legacy systems or orchestrate microservices into a unified API. It integrates with various AI providers, including Ollama, ChatGPT, and Gemini, to facilitate the creation of autonomous agent tools. The architecture utilizes a marketplace system where additional web-based apps can be installed to extend functionality, and a VSCode extension is available to assist with action development. Users can define configurable parameters within their actions, which are then exposed as forms in the backend for non-technical users to manage.

This software serves as a comprehensive API management layer for building and monetizing backend services for both human developers and AI agents.