Postio UK MCP Server

by postio-ukuk.co.postio/postcode-address-validationv0.1.4

Validate UK addresses, postcodes, emails and phone numbers — Royal Mail PAF, live SMTP and HLR.

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Active3d ago

Install Postio UK MCP server

claude mcp add postio-uk -e POSTIO_API_KEY='<postio-api-key>' -- npx -y @postio/mcp

{
  "mcpServers": {
    "postio-uk": {
      "command": "npx",
      "args": [
        "-y",
        "@postio/mcp"
      ],
      "env": {
        "POSTIO_API_KEY": "<postio-api-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "postio-uk": {
      "command": "npx",
      "args": [
        "-y",
        "@postio/mcp"
      ],
      "env": {
        "POSTIO_API_KEY": "<postio-api-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "postio-uk": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@postio/mcp"
      ],
      "env": {
        "POSTIO_API_KEY": "<postio-api-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "postio-uk": {
      "command": "npx",
      "args": [
        "-y",
        "@postio/mcp"
      ],
      "env": {
        "POSTIO_API_KEY": "<postio-api-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
POSTIO_API_KEY	yes	yes	Postio API key (pk_…). Free key, first 100 lookups on us, no card: https://postio.co.uk/signup
POSTIO_BASE_URL	—	—	Override the API base URL. Defaults to https://api.postio.co.uk. Only needed for staging.

Freshness

Active — last maintenance signal 3d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-10-06 · 3d ago · GitHub
Latest release
no data · GitHub
Package published
no data · npm/PyPI
Registry entry updated
2026-08-14 · 56d ago · official registry · v0.1.4

FAQ

›How do I install the Postio UK MCP server in Claude Code?

Run: claude mcp add postio-uk -e POSTIO_API_KEY='<postio-api-key>' -- npx -y @postio/mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Postio UK require an API key?

Yes. It expects POSTIO_API_KEY, of which 1 is a secret.

›Can I use Postio UK as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Postio UK in the official MCP registry?

Yes, as uk.co.postio/postcode-address-validation.