usps-mcp

USPS MCP

MCP server for USPS shipping, tracking, address validation, and label creation.

Tools

• get_rate - Get shipping rate estimates
• create_label - Create shipping labels
• track_package - Track packages
• validate_address - Validate addresses
• get_zip_code - Look up ZIP by city/state
• get_address_info - Get info from ZIP code
• schedule_pickup - Schedule USPS pickup
• get_service_standards - Check delivery times

Install

npx usps-mcp

Env Vars

• USPS_API_KEY - USPS API key (Bearer token)
• USPS_USERNAME / USPS_PASSWORD - Basic auth
• USPS_API_URL - Custom API URL (default: https://api.usps.com)

Premium tools

These tools need a license key:

• postal_lookup

Buy a key at https://mcp-marketplace.io/server/io-github-mrfentmen-usps-mcp and set it in your MCP client config:

"env": { "MCP_LICENSE_KEY": "mcp_live_..." }

The key is checked against MCP Marketplace, cached for 24 hours, and keeps working offline once one check has succeeded. Every other tool on this server stays free.