USPS package barcodes, service type codes and mailing terms, each cited to its USPS source.
Connect Remote server
claude mcp add --transport http postalref https://postalref.com/mcp{
"mcpServers": {
"postalref": {
"url": "https://postalref.com/mcp"
}
}
}{
"servers": {
"postalref": {
"type": "http",
"url": "https://postalref.com/mcp"
}
}
}Settings > Connectors > Add custom connector
URL: https://postalref.com/mcpTools 8 found in our last check
decodeRead a package barcode or tracking number (IMpb), or a letter's or flat's Intelligent Mail barcode (IMb) from its digits or bars: its layout, each field's digits and meaning, whether the check digit or the bars' frame check holds, and the service type code's or Service Type ID's…
lookupLook 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 its history, each row with its passage id. A code is found without the marks USPS prints around it and in a row USPS prints for several cod…
diffWhat changed in a code table or document between two editions: each code added, removed or changed and each changed section, rated editorial, additive or breaking, with who rated it.
searchSearch the codes, terms, banner texts, specs and documents postalref models, by one index: names and codes whose key is the query's first, then those that start with it, then those with words that start with its words, then codes whose row has its words. A term hit carries its k…
defineWhat 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 words that define it and the page they're on, its other names, postalref's own explanation where it has one, and postalref's page about it. A…
read_sourceRead any document postalref holds page by page, as extracted, to quote it: a quote cites the revision's sha256, the PDF page and the words exactly. A text without pages, a web page or a product page, reads in parts, and a quote from one cites no page. Quote whole sentences, word…
search_documentsSearch every document on PostalPro by title and file name, with its page and newest file, and the product pages and downloads postalref holds by title. Each one postalref holds the text of carries an `id`, which read_source takes as `document`. A title says only that USPS publis…
search_textSearch the text of every document postalref holds, or of one, for the pages that say the words, best first: those that say them as a phrase, then by how much of the page they are and how many of them it says side by side or close together, a table of contents last. A court's fil…
Details
| Endpoint | https://postalref.com/mcp (Streamable HTTP) |
| First published | 8 Nov 2026 |
| Last updated | 8 Nov 2026 |
| Registry name | com.postalref/postalref |
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