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Fused - Connect Your APIs Once, Use Everywhere In a team workspace, approve internal and partner APIs so developers can build with a typed SDK, deploy a shared Unified App template with their own credential bucket, or give an agent selected tools through MCP. For a solo project or business, start a lightweight workspace in Fused Cloud or host it yourself. Use separate buckets for project secrets and choose which services each assistant can access. Create one App to deliver its selected operations as a typed SDK, a Fused REST API, and a hosted MCP server. The three methods share one App identity, immutable version, and execution token. Fused keeps provider credentials out of your application code and agent context.

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How it works

Registry

A catalogue of versioned service contracts that describe APIs and how to connect to them.

Fused Engine

Your workspace runtime, hosted or self-hosted. It checks access, resolves credentials, calls providers, and records each execution.
Your workspace defines which services are available. Each App exposes the operations its callers need, and buckets hold the provider credentials used for those calls.

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Get started

First, get Fused running. Then create an App with all three delivery methods, or choose one method explicitly:

Create your first App

Install the CLI, select operations once, and use the SDK, MCP, or REST method.

Deploy an MCP server

Give an agent scoped access to operations across your services.
Need only one method? Follow the SDK-only or MCP-only guide. For HTTP without a generated package, use the REST-only setup.