Fusio website screenshot

Fusio

Fusio is an open source API management platform which helps to build and manage REST APIs. It provides capabilities for creating, managing, and documenting APIs with a built-in developer portal, marketplace, and support for multiple programming languages through worker processes.

Fusio publishes 3 APIs on the APIs.io network. Tagged areas include API Management, Open Source, and REST API.

Fusio’s developer surface includes documentation, getting-started guide, engineering blog, changelog, support, and 5 more developer resources.

27.7/100 emerging ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessFreemium
3 APIs 8 Features 4 Use Cases
API ManagementOpen SourceREST API

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 27.7/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 6.5 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 6.8 / 13
Governance 0.0 / 12
Discoverability 6.5 / 10
Agent readiness — 3/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/fusio: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

Fusio Backend API

The Fusio Backend API provides a REST interface to configure and manage all aspects of a Fusio API management instance. It covers operations, routes, schemas, actions, connectio...

Fusio Consumer API

The Fusio Consumer API is used by the developer portal application and enables third-party developers to request access tokens, manage their apps, and interact with protected AP...

Fusio Worker API

The Fusio Worker API enables executing API action logic in multiple programming languages by forwarding requests to external worker processes. Workers are implemented in the tar...

Pricing Plans 1

Published pricing tiers and plan structures.

Fusio Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Fusio Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Fusio Finops

FINOPS

Features 8

Notable capabilities this provider offers.

API Gateway

Route and manage incoming API requests with built-in rate limiting and authentication.

Developer Portal

Self-service developer portal for API consumers to register, browse APIs, and manage access tokens.

Multi-Language Workers

Execute API action logic in JavaScript, Python, Java, PHP, and other languages through worker processes.

Marketplace

Browse and install pre-built API actions and adapters from the Fusio marketplace.

Schema Management

Define and manage API request and response schemas using TypeSchema format.

OAuth2 Authentication

Built-in OAuth2 server for securing APIs with token-based authentication.

Rate Limiting

Configure per-app and per-user rate limits to protect API resources.

Webhook Support

Define webhook subscriptions to notify consumers of events.

Scroll for all 8

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Fusio Domain Security

TLSv1.3 · DMARC

SECURITY

Use Cases 4

What developers build with this provider.

API Product Building

Build and publish API products with documentation, authentication, and developer onboarding.

Microservices Gateway

Use Fusio as an API gateway in front of microservices for unified access control.

Data Integration

Connect to databases and external APIs to build data integration endpoints.

Serverless API Backend

Build API backends that execute logic in multiple languages without managing servers.

Integrations 5

Pre-built integrations with other platforms and tools.

MySQL and PostgreSQL

Connect to MySQL and PostgreSQL databases as data sources for API endpoints.

MongoDB

Use MongoDB as a NoSQL data source for API endpoints.

Elasticsearch

Integrate with Elasticsearch for search-powered API endpoints.

RabbitMQ

Use RabbitMQ for asynchronous message processing in API workflows.

Docker

Deploy Fusio and worker containers using Docker and Docker Compose.

Resources

Get Started 1

Portal, sign-up, and the first successful call

Documentation 1

Reference material describing how the API behaves

Build 3

SDKs, sample code, and the tooling you integrate with

Access & Security 1

Authentication, authorization, and security posture

Operate 2

Status, limits, changes, and where to get help

Company 1

The organization behind the API

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

apis.yml Raw ↑
aid: fusio
name: Fusio
description: Fusio is an open source API management platform which helps to build and manage REST APIs. It provides capabilities
  for creating, managing, and documenting APIs with a built-in developer portal, marketplace, and support for multiple programming
  languages through worker processes.
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/fusio.png
access: 3rd-Party
created: '2026-03-16'
modified: '2026-04-18'
position: Consumer
tags:
- API Management
- Open Source
- REST API
url: https://raw.githubusercontent.com/api-evangelist/fusio/refs/heads/main/apis.yml
specificationVersion: '0.19'
apis:
- aid: fusio:fusio-backend-api
  name: Fusio Backend API
  description: The Fusio Backend API provides a REST interface to configure and manage all aspects of a Fusio API management
    instance. It covers operations, routes, schemas, actions, connections, apps, users, and marketplace resources used by
    the Fusio backend application.
  humanURL: https://docs.fusio-project.org/docs/use_cases/api_product/
  baseURL: https://www.fusio-project.org/
  tags:
  - Backend
  - Configuration
  - Management
  - REST API
  properties:
  - type: Documentation
    url: https://docs.fusio-project.org/docs/use_cases/api_product/
  - type: GitHubRepository
    url: https://github.com/apioo/fusio
- aid: fusio:fusio-consumer-api
  name: Fusio Consumer API
  description: The Fusio Consumer API is used by the developer portal application and enables third-party developers to request
    access tokens, manage their apps, and interact with protected API endpoints. It provides the authentication and user management
    layer for API consumers.
  humanURL: https://docs.fusio-project.org/docs/backend/consumer/user/
  baseURL: https://www.fusio-project.org/
  tags:
  - Authentication
  - Consumer
  - Developer Portal
  - REST API
  properties:
  - type: Documentation
    url: https://docs.fusio-project.org/docs/backend/consumer/user/
  - type: APIReference
    url: https://docs.fusio-project.org/docs/backend/consumer/app
  - type: GitHubRepository
    url: https://github.com/apioo/fusio
- aid: fusio:fusio-worker-api
  name: Fusio Worker API
  description: The Fusio Worker API enables executing API action logic in multiple programming languages by forwarding requests
    to external worker processes. Workers are implemented in the target language (JavaScript, Python, Java, PHP, etc.) and
    communicate with the Fusio core via a simple REST interface, enabling serverless deployments.
  humanURL: https://docs.fusio-project.org/docs/concepts/worker_api
  baseURL: https://www.fusio-project.org/
  tags:
  - Multi-Language
  - REST API
  - Serverless
  - Worker
  properties:
  - type: Documentation
    url: https://docs.fusio-project.org/docs/concepts/worker_api
  - type: GitHubRepository
    url: https://github.com/apioo/fusio-worker-php
common:
- type: DomainSecurity
  url: security/fusio-domain-security.yml
- type: Documentation
  url: https://docs.fusio-project.org/
- type: GettingStarted
  url: https://docs.fusio-project.org/docs/bootstrap
- type: Blog
  url: https://www.fusio-project.org/blog
- type: ChangeLog
  url: https://github.com/apioo/fusio/blob/master/CHANGELOG.md
- type: GitHubOrganization
  url: https://github.com/apioo
- type: GitHubRepository
  url: https://github.com/apioo/fusio
- type: Support
  url: https://discord.com/invite/eMrMgwsc6e
- type: Marketplace
  url: https://www.fusio-project.org/marketplace
- type: SDKs
  url: https://docs.fusio-project.org/docs/backend/development/sdk
- type: Features
  data:
  - name: API Gateway
    description: Route and manage incoming API requests with built-in rate limiting and authentication.
  - name: Developer Portal
    description: Self-service developer portal for API consumers to register, browse APIs, and manage access tokens.
  - name: Multi-Language Workers
    description: Execute API action logic in JavaScript, Python, Java, PHP, and other languages through worker processes.
  - name: Marketplace
    description: Browse and install pre-built API actions and adapters from the Fusio marketplace.
  - name: Schema Management
    description: Define and manage API request and response schemas using TypeSchema format.
  - name: OAuth2 Authentication
    description: Built-in OAuth2 server for securing APIs with token-based authentication.
  - name: Rate Limiting
    description: Configure per-app and per-user rate limits to protect API resources.
  - name: Webhook Support
    description: Define webhook subscriptions to notify consumers of events.
- type: UseCases
  data:
  - name: API Product Building
    description: Build and publish API products with documentation, authentication, and developer onboarding.
  - name: Microservices Gateway
    description: Use Fusio as an API gateway in front of microservices for unified access control.
  - name: Data Integration
    description: Connect to databases and external APIs to build data integration endpoints.
  - name: Serverless API Backend
    description: Build API backends that execute logic in multiple languages without managing servers.
- type: Integrations
  data:
  - name: MySQL and PostgreSQL
    description: Connect to MySQL and PostgreSQL databases as data sources for API endpoints.
  - name: MongoDB
    description: Use MongoDB as a NoSQL data source for API endpoints.
  - name: Elasticsearch
    description: Integrate with Elasticsearch for search-powered API endpoints.
  - name: RabbitMQ
    description: Use RabbitMQ for asynchronous message processing in API workflows.
  - name: Docker
    description: Deploy Fusio and worker containers using Docker and Docker Compose.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com