The postalref MCP server,
connected in one click.
USPS package barcodes, service type codes and mailing terms, each cited to its USPS source. Connect the official postalref MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add postalref to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http postalref https://postalref.com/mcpRun in your terminal, then restart Claude Code.
postalref · https://postalref.com/mcp
What your AI can do with postalref
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “decode”: Read a package barcode or tracking number (IMpb): its layout, each field's digits and meaning, whether the check digit holds, and the servic.”
“Use “lookup”: Look up a USPS code: its row as USPS prints it in the newest edition that lists it, the codes its cells name, the editions that list it and.”
“Use “diff”: What changed in a code table or document between two editions: each code added, removed or changed and each changed section, rated editorial.”
“Use “search”: Search the codes, terms, banner texts, specs and documents postalref models, by one index: names and codes whose key is the query's first, t.”
How secure is the postalref MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how postalref holds up.
Official endpoint
Operated by postalref (postalref.com) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If postalref adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick postalref
Choose postalref in the gate directory. No sign-in needed.
Use it anywhere
postalref's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools postalref exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
decode — Read a package barcode or tracking number (IMpb): its layout, each field's digits and meaning, whether the check digit holds, and the servic
lookup — Look up a USPS code: its row as USPS prints it in the newest edition that lists it, the codes its cells name, the editions that list it and
diff — What changed in a code table or document between two editions: each code added, removed or changed and each changed section, rated editorial
search — Search the codes, terms, banner texts, specs and documents postalref models, by one index: names and codes whose key is the query's first, t
define — What USPS means by a name or abbreviation: each registry entry it names, in the order search ranks them, with its kind and tier, the USPS wo
read_source — Read a revision of a modeled USPS document page by page, as extracted, to quote it: a quote cites the revision's sha256, the PDF page and th
search_documents — Search every document on PostalPro by title and file name, with its page and newest file. postalref models a few of them; those carry a slug
Who runs the postalref MCP server?
The postalref MCP server at a glance
https://postalref.com/mcpQuestions, answered
Is there an official postalref MCP server?
Yes — postalref operates its own remote MCP server at postalref.com. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect postalref to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick postalref in the directory. No account or sign-in is needed. From then on, postalref's tools are available in every client you've connected to gate.
Do I need to host anything?
No. postalref runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the postalref MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect postalref in minutes. No credit card required.
Connect more than just postalref
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up postalref in: Claude · Claude Code · ChatGPT · Cursor · VS Code