How much is a stamp: USPS Forever stamp, postcard, international and letter postage by weight.
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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. Letters up to 3.5 oz, US large envelopes up to 13 oz.
Default "letter".
Number of identical pieces, for example 40 holiday cards. Default 1.
Weight in ounces. Default 1.
"US" (default), "Canada", "Mexico" or another country name.
True for square, rigid, lumpy or vertical letters and cards (adds the surcharge).
Pick your client. Values in capitals, like YOUR_TOKEN, are yours to fill in.
Run in a terminal
claude mcp add --transport http postage-stamp-price-mcp https://postage-stamp-price-mcp.lipmichal.workers.dev/mcp
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. Letters up to 3.5 oz, US large envelopes up to 13 oz.
| Argument | Type | Description |
|---|---|---|
| type | string | Default "letter". |
| quantity | integer | Number of identical pieces, for example 40 holiday cards. Default 1. |
| weight_oz | number | Weight in ounces. Default 1. |
| destination | string | "US" (default), "Canada", "Mexico" or another country name. |
| nonmachinable | boolean | True for square, rigid, lumpy or vertical letters and cards (adds the surcharge). |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {
"type": {
"enum": [
"letter",
"postcard",
"large_envelope"
],
"type": "string",
"description": "Default \"letter\"."
},
"quantity": {
"type": "integer",
"maximum": 10000,
"minimum": 1,
"description": "Number of identical pieces, for example 40 holiday cards. Default 1."
},
"weight_oz": {
"type": "number",
"maximum": 16,
"description": "Weight in ounces. Default 1.",
"exclusiveMinimum": 0
},
"destination": {
"type": "string",
"maxLength": 60,
"description": "\"US\" (default), \"Canada\", \"Mexico\" or another country name."
},
"nonmachinable": {
"type": "boolean",
"description": "True for square, rigid, lumpy or vertical letters and cards (adds the surcharge)."
}
},
"additionalProperties": false
}Current USPS retail prices for Priority Mail Flat Rate envelopes and Small, Medium, Large and APO/FPO/DPO Flat Rate Boxes, and Priority Mail Express Flat Rate envelopes, from Notice 123.
No arguments.
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {}
}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) price, read at call time from USPS Notice 123 with its effective date.
No arguments.
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {}
}We read every tool's name, description and inputs the way the model will, looking for instructions hidden from you. A clean result means no warning signs, not a guarantee. Scanned Nov 5, 2026.