Terms of use

postalref explains USPS's public documents and links each fact to the page it comes from.

postalref isn't part of the United States Postal Service, and USPS hasn't reviewed or approved it. USPS's names and marks belong to USPS.

postalref can be wrong or out of date. Ask's answers come from a language model, which can misread a page even as it cites it.

Before you rely on a rule, a price or a code, read the USPS document postalref cites. USPS's documents and decisions govern your mail, not postalref.

postalref gives no legal, tax or business advice.

• Use postalref for any lawful purpose, including in your own tools and agents.
• Don't use it to make counterfeit postage, labels or barcodes, or to get around USPS's rules.
• Don't overload the site, Ask or the MCP server, or get around their limits.

Ask answers a set number of questions per person each day, and it stops for the day when its budget is spent.

Ask keeps each question and its answer on a page anyone with its address can read, as the privacy page explains. Don't type anything private into it.

postalref is free and comes as it is, with no warranty of any kind. Its pages, Ask and the MCP server can change, break or stop at any time.

As far as the law allows, postalref isn't liable for any loss from using the site, Ask or the MCP server. That includes postage, fees, penalties and lost shipments that follow from relying on an answer.

postalref posts any change to these terms here and updates the date at the top. Using postalref after a change means you accept the new terms.

Write to support@postalref.com with any question about these terms.