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io.github.mrfentmen/usps-mcp

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USPS shipping, tracking, address validation, and label creation.

Source code

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package usps-mcp
Claude Code 
claude mcp add usps-mcp -e 'USPS_API_KEY=<your usps_api_key>' -e 'USPS_USERNAME=<USPS_USERNAME>' -e 'USPS_PASSWORD=<your usps_password>' -e 'USPS_API_URL=<USPS_API_URL>' -- npx -y usps-mcp@1.0.0
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "usps-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "usps-mcp@1.0.0"
            ],
            "env": {
                "USPS_API_KEY": "<your usps_api_key>",
                "USPS_USERNAME": "<USPS_USERNAME>",
                "USPS_PASSWORD": "<your usps_password>",
                "USPS_API_URL": "<USPS_API_URL>"
            }
        }
    }
}

Environment variables

  • USPS_API_KEY secret USPS API key
  • USPS_USERNAME USPS username for basic auth
  • USPS_PASSWORD secret USPS password for basic auth
  • USPS_API_URL USPS API base URL (default: https://api.usps.com)

Frequently asked questions

What is io.github.mrfentmen/usps-mcp?

USPS shipping, tracking, address validation, and label creation.

How do I install io.github.mrfentmen/usps-mcp?

It runs on your machine. In Claude Code: claude mcp add usps-mcp -e 'USPS_API_KEY=<your usps_api_key>' -e 'USPS_USERNAME=<USPS_USERNAME>' -e 'USPS_PASSWORD=<your usps_password>' -e 'USPS_API_URL=<USPS_API_URL>' -- npx -y usps-mcp@1.0.0. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.mrfentmen/usps-mcp need an API key?

Yes. It expects USPS_API_KEY, USPS_PASSWORD, which you set in its configuration.

Is io.github.mrfentmen/usps-mcp open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains io.github.mrfentmen/usps-mcp?

It is published by mrfentmen. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.