postalref for Claude Code

com.postalref/postalref

USPS package barcodes, service type codes and mailing terms, each cited to its USPS source.

client:Claude Code transport:streamable-http tools:8

Install postalref in Claude Code

run in your project directory

claude mcp add --transport http postalref https://postalref.com/mcp

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs