Koskamo

Postio MCP

An official MCP server provided by Postio that enables AI agents to validate UK addresses, postcodes, emails, and phone numbers using Royal Mail PAF, live SMTP, and HLR data. It exposes six tools for address search, postcode lookup, UDPRN retrieval, and contact validation.

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Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Postio MCP logo, by PostioVendor evidenceLocal stdioSource reviewed; not executedOperated by Postio
You need:Get an API key
Vendor documentation

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Official MCP Registry namespace is tied to postio.co.uk ·

What you can do with it

  • Validate UK addresses and postcodes via Royal Mail PAF
  • Verify email syntax and deliverability via live SMTP
  • Check phone number validity via live HLR carrier lookup
  • Retrieve specific delivery points using UDPRN

Source and maintenance

Vendor evidenceRegistry 0.1.5MIT
mcp-registry: uk.co.postio/postcode-address-validation@0.1.5Source repositoryProject website
Last repository push
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@postio/mcp 0.1.5

npmnpx
@postio/mcp package definition
{
  "version": "0.1.5",
  "transport": "stdio",
  "identifier": "@postio/mcp",
  "runtimeHint": "npx",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org",
  "environmentVariables": [
    {
      "name": "POSTIO_API_KEY",
      "format": "string",
      "isRequired": true,
      "description": "Postio API key (pk_…). Free key, first 100 lookups on us, no card: https://postio.co.uk/signup"
    },
    {
      "name": "POSTIO_BASE_URL",
      "format": "string",
      "description": "Override the API base URL. Defaults to https://api.postio.co.uk/v1 (include /v1). Only needed for staging."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · repository · passed · metadata changed · updated
  • · backfill · recorded · Pre-expansion baseline; unobserved rich metadata remains unknown

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "postio-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@postio/mcp@0.1.5"
      ],
      "env": {
        "POSTIO_API_KEY": "<YOUR_POSTIO_API_KEY>",
        "POSTIO_BASE_URL": "<YOUR_POSTIO_BASE_URL>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "postio-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@postio/mcp@0.1.5"
      ],
      "env": {
        "POSTIO_API_KEY": "<YOUR_POSTIO_API_KEY>",
        "POSTIO_BASE_URL": "<YOUR_POSTIO_BASE_URL>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "postio-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@postio/mcp@0.1.5"
      ],
      "env": {
        "POSTIO_API_KEY": "<YOUR_POSTIO_API_KEY>",
        "POSTIO_BASE_URL": "<YOUR_POSTIO_BASE_URL>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "postio-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@postio/mcp@0.1.5"
      ],
      "env": {
        "POSTIO_API_KEY": "<YOUR_POSTIO_API_KEY>",
        "POSTIO_BASE_URL": "<YOUR_POSTIO_BASE_URL>"
      }
    }
  }
}

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