Companies House vs PayPerFax

In-depth architectural comparison of the Companies House and PayPerFax MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Companies House when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• You have access to required keys: COMPANIES_HOUSE_API_KEY.
• Primary tools included: Company and officer search, Company profiles and statutory records, Ownership, appointments and disqualification lookup.

Explore Companies House Details

P

Choose PayPerFax when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: create_fax, get_fax_status, list_supported_formats.

Feature & Specification Comparison

Specification	Companies House Developer Tools	P PayPerFax Developer Tools
Summary	MCP server and CLI for the UK Companies House API. Search, filings, officers, due diligence.	Send a fax from AI. Pay per fax. No registration or subscription. Pay only for successful faxes.
Category & Scope	Developer Tools	Developer Tools
Quality signal

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "companies-house": {
      "command": "npx",
      "args": [
        "-y",
        "companies-house-mcp"
      ],
      "env": {
        "COMPANIES_HOUSE_API_KEY": "YOUR_COMPANIES_HOUSE_API_KEY_HERE"
      }
    }
  }
}

{
  "mcpServers": {
    "payperfax": {
      "url": "https://fax.payperfax.com/mcp"
    }
  }
}

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