Fusio

Fusio is a self-hostable API management platform aimed at developers who need to take backend logic and expose it as production-ready APIs. It covers the full lifecycle: from creating and securing endpoints to monetizing them and generating client SDKs automatically.

The platform sits between your data and the outside world. You can point it at an existing SQL or NoSQL database and instantly expose it as a REST API, without writing boilerplate. It also acts as a microservice gateway, handling routing, authentication, and traffic orchestration across services.

Key capabilities include:

• Database API Gateway: expose legacy databases as REST endpoints with minimal setup
• Microservice Gateway: secure and route traffic between internal services
• Analytics & Monitoring: track usage, performance, and errors in real time
• Developer Portal: self-service documentation, API key management, and testing tools for consumers
• API Monetization: manage subscription plans, quotas, and billing directly within the platform
• SDK Generation: automatically produce client libraries in multiple languages
• AI and MCP Integration: connect APIs to AI agents and model context protocol workflows

The AI integration angle sets Fusio apart from tools like Gravitee or Nango. Where those focus on gateway routing or integration syncing, Fusio explicitly targets AI agent consumption, making it practical for teams building on top of LLM frameworks like Langflow or Dify that need structured API access.

Licensed under Apache 2.0, it's built for teams that want full control over their API infrastructure without depending on a managed cloud vendor.