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Postage stamp price MCP server

The current USPS Forever stamp price and letter, postcard and flat rate postage from the official USPS price list.

Connect free Source on GitHub

Free. No key, no sign-in, no paid tier. 3 tools.

Can Claude tell me how much a stamp costs?

Connector URL

https://postage-stamp-price-mcp.lipmichal.workers.dev/mcp

Paste it as a custom connector in Claude, or add it to Claude Code, Cursor or VS Code. Setup for each is below.

What it knows that a model doesn't

A model answers from training data. This server reads the source when you ask.

  • The Forever stamp price from USPS Notice 123 with its effective date ($0.82 from October 4, 2026), plus the extra ounce, postcard, large envelope and Global Forever prices.
  • Postage for a letter, postcard or large envelope by weight to the US or another country, with the surcharge for square cards and the total for a quantity.
  • Retail Priority Mail and Priority Mail Express flat rate envelope and box prices.

Sources USPS Notice 123, the official retail price list on Postal Explorer (pe.usps.com/text/dmm300/Notice123.htm), read at call time with its effective date.

Tools (3)

Read from the live server with tools/list on 2026-11-05.

ToolWhat it does
get_stamp_price Get stamp price. The current USPS Forever stamp price (First-Class Mail 1 oz stamped letter), the 2, 3 and 3.5 oz prices, metered letter prices, postcard, 1 oz large envelope, the nonmachinable surcharge and the 1 oz international letter (Global Forever)...
calculate_letter_postage Calculate letter postage. Retail postage for one letter, postcard or large envelope (flat) by weight, to the US, Canada, Mexico or any other country, with the nonmachinable surcharge for square or rigid cards, the total for a quantity, and the number of Forever stamps per piece.
get_flat_rate_prices Get flat rate box prices. Current USPS retail prices for Priority Mail Flat Rate envelopes and Small, Medium, Large and APO/FPO/DPO Flat Rate Boxes, and Priority Mail Express Flat Rate envelopes, from Notice 123.

Connect it

One URL, no token. Pick your app.

Claude.ai and Claude Desktop

Open Settings, then Connectors, then Add custom connector. Paste the URL. Leave the OAuth fields empty. Save.

https://postage-stamp-price-mcp.lipmichal.workers.dev/mcp

Claude Code

Run this in your terminal. Then run claude mcp list to check it.

claude mcp add --transport http postage-stamp-price https://postage-stamp-price-mcp.lipmichal.workers.dev/mcp

Cursor

Merge this into ~/.cursor/mcp.json (all projects) or .cursor/mcp.json (one project).

{
  "mcpServers": {
    "postage-stamp-price": {
      "url": "https://postage-stamp-price-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

VS Code

Put this in .vscode/mcp.json. The top key is servers, not mcpServers.

{
  "servers": {
    "postage-stamp-price": {
      "type": "http",
      "url": "https://postage-stamp-price-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

Things to ask

Paste one into a new chat after you connect.

Sourcegithub.com/theluckystrike/postage-stamp-price-mcp

Questions

Is the postage stamp price MCP server free?
Yes. The hosted URL is free and needs no token, key or account. The source is open on GitHub.
Why not just ask the model?
A model answers from its training data. That data stops at a cutoff date, and long sums can drift. This server reads its data or rules each time you ask, so the answer is current and exact.
Where does the data come from?
USPS Notice 123, the official retail price list on Postal Explorer (pe.usps.com/text/dmm300/Notice123.htm), read at call time with its effective date.
Which apps can use it?
Any MCP client that accepts a remote server URL: Claude.ai and Claude Desktop custom connectors, Claude Code, Cursor, VS Code and others. You can also run it locally with npx.

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