Shipping Rates & Postage Calculator

com.onlineshippingcalculatorPublished by onlineshippingcalculator.comOfficial publisherv1.0.0Updated Oct 27, 2026

Live USPS, UPS & FedEx shipping rates plus USPS postage and stamp prices. Free, no API key.

VerifiedStreamable HTTPWeb executableBusiness & Commerce

Overview

AI-generated overview

Remote MCP server that gives an assistant live USPS, UPS and FedEx shipping rates and USPS postage and stamp prices for US mailings.

What you can do
  • Look up live USPS, UPS and FedEx rates for a package from a US ZIP code to a US or international destination, with carrier, service, USD price and estimated transit days, sorted cheapest first.
  • Get the current USPS First-Class postage price for a letter, flat or postcard mailed within the US, including how many Forever stamps to use and an exact stamp combination that covers the postage.
When to use it
Useful when comparing carrier options and costs for a shipment, or when working out how much postage and which stamps a domestic US letter, flat or postcard needs.
Requirements
A remote streamable HTTP endpoint; no API key, environment variables or headers are declared.
Before you install
The returned shipping rates are discounted rates for postage bought online through shipping software, not retail counter prices, so they may differ from what a customer pays in person. Prices are quoted in USD and cover US-origin shipments only.

Installation

In SourceWeft

  1. Open Shipping Rates & Postage Calculator in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/com.onlineshippingcalculator%2Fshipping-rates/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "shipping-rates-postage-calculator": {
      "type": "http",
      "url": "https://onlineshippingcalculator.com/api/mcp"
    }
  }
}

Tools

2

get_shipping_rates

Get package shipping rates

Get live USPS, UPS, and FedEx shipping rates for a package from a US ZIP code to a US or international destination. Returns carrier, service, price in USD, and estimated transit days, sorted cheapest first. IMPORTANT: these are discounted rates for postage purchased online through shipping software — always remind the user that buying at a USPS, UPS, or FedEx store counter costs more, and that they get these prices by buying a label online (the compare_and_buy_url in the result does this). Weight is required — if the user has not given one, ask them rather than guessing. Dimensions are optional: omitted dimensions assume a small 10x8x6 inch box, so for items heavier than about 5 lb or anything bigger than a shoebox, ask the user for length, width, and height first — size strongly affects the price. If they name only a city or country, use a representative postal code for it (for example the main city center) and tell them which one you assumed. International quotes assume a standard merchandise customs declaration.

Parametersto_ziprequiredweightrequiredfrom_ziprequiredwidth_inheight_inlength_into_countryweight_unit

get_postage_price

Get USPS postage price

Get the current USPS First-Class postage price for a letter, large envelope (flat), or postcard mailed within the US — including how many Forever stamps to put on it and an exact combination of stamp denominations that covers the postage with no waste. Prices are zone-independent (same anywhere in the US). For boxes and parcels use get_shipping_rates instead.

Parametersouncesmail_classrequired

Version history

1
  1. v1.0.0LatestSep 16, 2026

Score

83% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.