About Fusio

Fusio is an open source API management platform that helps developers create, manage, and scale APIs in one place. It provides routing, OAuth2 authentication, rate limiting, SDK generation, OpenAPI documentation, and monetization features. Fusio includes a backend admin panel to control and monitor APIs, a developer portal for API consumers, and a marketplace for sharing reusable actions and apps.

Pros & Cons

Pros

Completely free and open source
Built-in API monetization — rare for OSS platforms
Auto-generates SDKs in multiple languages
Developer portal included out of the box
Active development with modern feature additions

Cons

Key Features

API routing and request handling

OAuth2 authentication and authorization

Rate limiting and throttling

OpenAPI specification generation

Client SDK generation

Client SDK generation (C#, Go, Java, Python)

API monetization and subscription billing

Developer portal for API consumers

Backend admin panel with analytics

Pricing

Open Source

Free

Full API management
OAuth2 authentication
Rate limiting
OpenAPI generation
Self-hosted

Best For

API Management

Create, manage, and scale APIs with routing, auth, rate limiting, and documentation in one platform

API Monetization

Monetize APIs with built-in subscription billing and developer portal

Fusio