# 0mcp

0mcp converts selected operations from an OpenAPI-described API into a hosted Model Context Protocol (MCP) server. It helps SaaS, platform, and internal teams make approved API actions available to MCP-compatible AI clients without implementing and operating the protocol layer themselves.

- Findings24: <https://findings24.com/ja/products/0mcp>
- ウェブサイト: <https://0mcp.io>
- 料金: Freemium
- カテゴリー: AIエージェント基盤, MCPツール

## 0mcpとは？

0mcp is a managed platform for turning an existing OpenAPI-described REST API into a hosted Model Context Protocol (MCP) server. Teams import their API specification, select the operations they want to expose, review the agent-facing tool configuration, and deploy a hosted endpoint. The existing backend remains responsible for business logic, data, validation, authorization, permissions, and rate limits.

The platform adds the agent-facing protocol layer without requiring a REST API rewrite. Configured credentials are forwarded to the upstream API, while 0mcp retains operational metadata such as request status, latency, and errors for monitoring. It does not store proxied API request or response payloads, upstream credentials, or business data.

## 0mcpでできること

### OpenAPI-to-MCP tool generation

Import an OpenAPI specification and generate MCP tools from its operations, parameters, request schemas, descriptions, and authentication requirements.

### Operation allowlisting

Choose the specific API operations that become visible to AI clients, keeping internal, administrative, or sensitive endpoints unpublished unless explicitly approved.

### Authentication pass-through

Forward configured credentials to the existing backend so the API continues to own authorization, permissions, validation, business logic, and data access.

### Interactive MCP Playground

Run live tool calls from the server workspace with representative inputs, then inspect outputs, status, latency, execution logs, and errors before client setup.

### Revision control and managed hosting

Publish deliberate changes to MCP tools and agent-facing descriptions through a hosted endpoint operated by 0mcp, rather than maintaining the protocol infrastructure in-house.

### Operational usage visibility

Monitor capability calls, response status, latency, failures, and errors. 0mcp says proxied request and response bodies are not stored.

## 利用シーン

### Customer-facing SaaS actions

A SaaS team can expose approved product operations—such as creating records, searching account data, updating subscriptions, or triggering workflows—through an MCP endpoint while keeping its existing API and account controls in place.

### Governed internal agents

An internal platform team can publish a smaller set of approved tools for employee-facing agents, reducing the need for one-off scripts and keeping unsuitable API operations outside the agent surface.

### Developer platform distribution

A developer-platform team can offer MCP access alongside REST documentation, giving users an additional way to interact with selected API operations through compatible AI applications.

### Pre-production tool validation

Before connecting Claude, ChatGPT, Cursor, or another MCP client, a team can use the Playground to test required inputs, success and error paths, upstream behavior, and agent-facing responses with live calls.

### API and tool change rollout

When an API operation or its agent-facing description changes, teams can review and publish a revision deliberately, then use operational signals to check status, latency, and failures after rollout.

## よくある質問

### Do I need to rewrite or migrate my REST API?

No. The existing REST API remains in place and continues to own business logic, data, validation, authorization, permissions, and rate limits. 0mcp adds an MCP-compatible layer for the operations you approve.

### How do I control which API actions AI clients can use?

Import the OpenAPI specification, select the operations to publish, and review their agent-facing names and descriptions before deploying the hosted MCP server. Unselected operations remain outside the published tool surface.

### Which AI clients can connect to an 0mcp server?

The site lists Claude, ChatGPT, Cursor, VS Code, Windsurf, Gemini, Codex, custom AI applications, and other applications that support the Model Context Protocol.

### Can I test tools before connecting a production AI client?

Yes. The MCP Playground runs live calls through the configured server and lets you inspect output, status, latency, logs, and errors. Because tests can reach the upstream API, use test-safe data and credentials for operations that create, update, or delete records.

### Does 0mcp store API request and response data?

0mcp says it does not store proxied API request or response payloads, upstream credentials, or business data. It retains operational metadata such as status, latency, and errors for monitoring and reliability.

## クイック情報

- **Category**: Developer Tool
- **Primary workflow**: OpenAPI import → operation selection → hosted MCP deployment
- **Protocol**: Model Context Protocol (MCP)
- **Target users**: SaaS, platform, and internal engineering teams
- **Compatible clients**: Claude, ChatGPT, Cursor, VS Code, Windsurf, Gemini, Codex, and other MCP-compatible applications
- **Billing model**: Usage-based capability billing; Starter and Pro plans are listed