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Fusio

Build and manage REST APIs with an open source platform and AI/MCP agents.

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Fusio is an open-source API management platform that maps HTTP methods and paths to operations, enforcing data integrity through schemas while exposing business logic as REST APIs. It connects to databases and external services, allowing developers to turn backend logic into APIs consumable by web, mobile, and AI agent clients.

Core entities include Operation, Action, Schema, Connection, Event, Cronjob, and Trigger. Actions can run custom logic in PHP, JavaScript, Python, or Java/Groovy, with connections to MySQL, PostgreSQL, MongoDB, and HTTP/REST services. The platform supports asynchronous workflows via events and webhooks, scheduled cronjobs, and event-driven triggers. Additional capabilities include a developer portal for self-service documentation and API keys, API monetization with plans and quotas, automated multi-language SDK generation (C#, Go, Java, JavaScript, PHP, Python), and MCP integration for AI agents. A marketplace offers community-shared apps and bundles, including Swagger UI, ReDoc, and account management tools.

Fusio is aimed at developers building and managing APIs, including those integrating AI agents through MCP. It is available as open-source software with a live demo and a backend app for development and configuration.

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