OpenAPI-to-tool conversion
Generate MCP tools from the OpenAPI contract you already maintain.
Turn your OpenAPI API into a hosted MCP server.
0mcp converts approved operations from your OpenAPI specification into MCP tools and serves them through a managed endpoint. Your existing API keeps its business logic, permissions, validation, and data; 0mcp operates the agent-facing protocol layer.
hosted-mcp-server
Online01 / Source
Your REST API
GET /customers
POST /orders
PATCH /projects/:id
02 / Contract
OpenAPI Specification
Schemas understood
Operations selected
Auth preserved
03 / Hosted endpoint
0mcp Hosted MCP Server
TOOL ACCESSALLOWLISTED
PAYLOAD STORAGEOFF BY DEFAULT
OPERATIONSMONITORED
Production controls around every generated MCP tool
Operation allowlisting
Publish a deliberate subset of API operations so the agent-facing surface is smaller and easier to review.
Authentication pass-through
Forward configured credentials to the upstream API while your backend remains responsible for authorization and permissions.
Revision control
Review and publish MCP changes deliberately as API operations and agent-facing descriptions evolve.
Usage and reliability analytics
Track tool calls, latency, response status, and errors without storing proxied request or response bodies by default.
Managed MCP endpoint
Connect compatible AI applications and custom agents to one hosted server surface instead of operating it yourself.
Build vs host
Choose how you ship MCP
Own every infrastructure detail, or start from your OpenAPI contract with a managed platform.
Build in-house
- Implement and host the protocol layer
- Build operation review and versioning
- Add monitoring and client setup
Use 0mcp
- Generate and host it from OpenAPI
- Select operations and publish revisions
- Use built-in analytics and one endpoint
Who should use an OpenAPI-generated MCP server?
01
Customer-facing SaaS APIs
- Create and update records
- Search account data
- Trigger product workflows
02
Internal platform APIs
- Give internal agents governed tools
- Standardize API access
- Reduce one-off scripts
03
Developer platforms
- Offer MCP access beside REST docs
- Improve AI client adoption
- Test capability design
FAQs
What is an MCP server?
An MCP server is a program that exposes tools, resources, or prompts to AI applications through the Model Context Protocol. In this workflow, 0mcp presents selected REST API operations as MCP tools while the original API continues to execute the underlying business logic.
What is a hosted MCP server?
A hosted MCP server is a remotely available Model Context Protocol endpoint whose deployment and protocol infrastructure are operated for you. With 0mcp, the hosted layer exposes approved API operations as tools and forwards valid calls to your existing backend.
How does 0mcp convert OpenAPI to MCP tools?
0mcp reads operations, parameters, request schemas, descriptions, and authentication requirements from an OpenAPI specification. You choose which operations to publish and review their agent-facing names and descriptions before 0mcp serves them as tools from a hosted MCP endpoint.
Do I need to rewrite or migrate my REST API?
No. Your REST API remains in place and continues to own data, business logic, validation, authorization, permissions, and rate limits. 0mcp adds an MCP-compatible layer in front of the operations you approve; it does not replace the backend.
Can I choose which API endpoints become MCP tools?
Yes. You select the API operations that become MCP tools before publishing. This allowlist keeps internal or unsuitable endpoints out of the agent-facing surface and gives reviewers a smaller, intentional capability set to assess.
How is authentication handled?
0mcp forwards requests according to your configured authentication behavior. The upstream API remains responsible for checking credentials, user permissions, authorization rules, and rate limits. Teams should expose only appropriate operations and test both successful and denied calls before publishing.
Does 0mcp store proxied request and response bodies?
Proxied request and response bodies are not stored by default. 0mcp can retain operational metadata—such as the tool called, response status, latency, and error signals—for monitoring. Review the privacy policy and your configuration for the current data-handling terms.
When should a team use 0mcp instead of building an MCP server?
Use 0mcp when you already have an OpenAPI-described API and want a managed path for operation selection, testing, hosting, revisions, and analytics. Build in-house when MCP infrastructure is a core competency or you need protocol behavior that a managed platform does not support.
Turn your OpenAPI spec into a hosted MCP server.
Import your spec, approve the operations AI clients can call, test the behavior, and publish an MCP endpoint without rebuilding your backend.