Fusio
Fusio is a free, open-source API management platform for connecting business logic and infrastructure to APIs.
What Fusio is
Fusio is a free, open-source API management platform for connecting business logic and infrastructure to APIs. It is self-hosted, with a unified gateway that links databases, microservices, and custom scripts while managing routing, authentication, and request validation. TypeSchema models add validation and can generate OpenAPI specifications and client SDKs in multiple languages. A developer portal provides documentation, testing tools, and API keys, while API monetization features manage plans, quotas, subscriptions, and billing. The platform also describes optional AI-assisted development and AI/MCP integration. Official adapters connect Fusio with services and technologies such as 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. Install it from a release archive, through Composer, or with Docker. Fusio’s code is licensed under Apache 2.0.
Good
- Self-hosted API gateway connects multiple backend types.
- TypeSchema can generate OpenAPI specifications and SDKs.
- Includes developer portal with testing tools and API keys.
- Built-in authentication, rate limiting, and request validation.
- Free and open source under Apache 2.0.
Watch out
- Requires self-hosted installation and operation.
- AI features are optional, not core requirements.
Who it suits
Fusio suits developers and organizations building or operating APIs who want a self-hosted management platform. Its monetization tools may also suit teams managing API plans and subscriptions.
Verdict
Fusio brings API routing, security controls, documentation, and monetization features into a self-hosted platform. Its broad adapter and runtime support is useful for teams working across different services and languages.
Plans and prices
From Fusio's own pricing page, checked 9 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Fusio | Free | Open-source API management platform · Apache 2.0 code license |
The facts
Each one read from Fusio's own pages, with the date it was checked.
What it does
- AI and MCP
- The site describes AI-assisted development and AI/MCP integration, and says AI features are optional.checked 9 Oct 2026
- Developer portal
- The platform includes a developer portal with documentation, testing tools, and API keys.checked 9 Oct 2026
- Execution languages
- Fusio offers worker runtimes for PHP, JavaScript, and Python.checked 9 Oct 2026
- Gateway
- Its unified API gateway connects databases, microservices, and custom scripts while handling routing, authentication, and request validation.checked 9 Oct 2026
- Installation options
- Fusio can be installed from a release archive, through Composer, or with Docker.checked 9 Oct 2026
- Integrations
- Official adapters connect with services and technologies including AWS, Google Cloud, GraphQL, HTTP, LDAP, MongoDB, Redis, SQL, Stripe, and SOAP.checked 9 Oct 2026
- License
- The Fusio site states that its code is licensed under Apache 2.0.checked 9 Oct 2026
- Monetization
- Fusio can manage plans, quotas, subscriptions, and billing through its API monetization features.checked 9 Oct 2026
- Purpose
- Fusio is an open-source API management platform for connecting business logic and infrastructure to APIs.checked 9 Oct 2026
- Schema automation
- TypeSchema models provide validation and automatic OpenAPI specifications and multi-language client SDK generation.checked 9 Oct 2026
- SDKs
- The developer hub lists SDKs for C#, Go, Java, JavaScript, PHP, and Python.checked 9 Oct 2026
- Security controls
- The platform documentation describes authentication, granular rate limiting, and request validation as built-in API management capabilities.checked 9 Oct 2026
- Self-hosted
- Fusio describes itself as self-hosted API management for builders.checked 9 Oct 2026
- Support
- The project offers real-time Discord support and architectural discussions, plus an issue tracker for bugs and feature requests.checked 9 Oct 2026
The company
- Headquarters
- Heiligenhaus, Germanychecked 28 Sep 2026
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