Fusio
Heiligenhaus, Germany
What it is
Fusio is a free, open-source API management platform for connecting business logic and infrastructure to APIs. It is self-hosted and provides a gateway for linking databases, microservices and custom scripts, with routing, authentication and request validation. TypeSchema models support validation and can generate OpenAPI specifications and client SDKs in several languages. A developer portal provides API documentation, testing tools and API keys. Fusio also offers API monetization features for managing plans, quotas, subscriptions and billing. The project describes AI-assisted development and AI/MCP integration, with AI features optional. Official adapters connect with technologies and services including AWS, Google Cloud, GraphQL, LDAP, MongoDB, Redis, SQL, Stripe and SOAP. Worker runtimes are available for PHP, JavaScript and Python, and SDKs are listed for C#, Go, Java, JavaScript, PHP and Python. Installation options include a release archive, Composer and Docker. The code is licensed under Apache 2.0. Built-in API management controls include authentication, granular rate limiting and request validation.
For and against
For
- Free, open-source platform licensed under Apache 2.0
- Gateway connects databases, microservices and custom scripts
- Generates OpenAPI specifications and client SDKs
- Includes a developer portal with testing tools
- Offers Docker, Composer and archive installation
Against
- Self-hosted deployment is required
- AI features are optional
The verdict
Fusio combines a self-hosted API gateway with schema tooling, a developer portal and monetization features. Its free Apache 2.0 license and multiple installation options make it an option for teams managing their own API infrastructure.
Who it suits
Fusio suits builders who want to self-host API management and connect existing infrastructure or custom scripts. It may also fit teams that need a developer portal, generated SDKs or API plans and billing.
Plans and prices
Fusio
Open-source API management platform · Apache 2.0 code license
Read 9 Oct 2026 · fusio-project.org
On the record
- AI and MCP
- The site describes AI-assisted development and AI/MCP integration, and says AI features are optional.fusio-project.org · read 9 Oct 2026
- Developer portal
- The platform includes a developer portal with documentation, testing tools, and API keys.fusio-project.org · read 9 Oct 2026
- Execution languages
- Fusio offers worker runtimes for PHP, JavaScript, and Python.fusio-project.org · read 9 Oct 2026
- Gateway
- Its unified API gateway connects databases, microservices, and custom scripts while handling routing, authentication, and request validation.docs.fusio-project.org · read 9 Oct 2026
- Installation options
- Fusio can be installed from a release archive, through Composer, or with Docker.fusio-project.org · read 9 Oct 2026
- Integrations
- Official adapters connect with services and technologies including AWS, Google Cloud, GraphQL, HTTP, LDAP, MongoDB, Redis, SQL, Stripe, and SOAP.fusio-project.org · read 9 Oct 2026
- License
- The Fusio site states that its code is licensed under Apache 2.0.fusio-project.org · read 9 Oct 2026
- Monetization
- Fusio can manage plans, quotas, subscriptions, and billing through its API monetization features.fusio-project.org · read 9 Oct 2026
- Purpose
- Fusio is an open-source API management platform for connecting business logic and infrastructure to APIs.fusio-project.org · read 9 Oct 2026
- Schema automation
- TypeSchema models provide validation and automatic OpenAPI specifications and multi-language client SDK generation.docs.fusio-project.org · read 9 Oct 2026
- SDKs
- The developer hub lists SDKs for C#, Go, Java, JavaScript, PHP, and Python.fusio-project.org · read 9 Oct 2026
- Security controls
- The platform documentation describes authentication, granular rate limiting, and request validation as built-in API management capabilities.docs.fusio-project.org · read 9 Oct 2026
- Self-hosted
- Fusio describes itself as self-hosted API management for builders.docs.fusio-project.org · read 9 Oct 2026
- Support
- The project offers real-time Discord support and architectural discussions, plus an issue tracker for bugs and feature requests.fusio-project.org · read 9 Oct 2026
