# Shipping Rates & Postage Calculator (remote · onlineshippingcalculator.com)

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

- Trust score: 63/100 (medium)
- Change this week: +2
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `onlineshippingcalculator.com`: 63/100 (this document), [markdown](https://verifymcp.io/servers/com-onlineshippingcalculator-shipping-rates/api-mcp.md), [page](https://verifymcp.io/servers/com-onlineshippingcalculator-shipping-rates/api-mcp)

## Channel facts

- Endpoint: `https://onlineshippingcalculator.com/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Endpoint Security**: 57/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 2 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 65/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 526 tokens (~263/item across 2 items; 2 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http com-onlineshippingcalculator-shipping-rates https://onlineshippingcalculator.com/api/mcp
```

### Codex

```toml
[mcp_servers.com-onlineshippingcalculator-shipping-rates]
url = "https://onlineshippingcalculator.com/api/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-onlineshippingcalculator-shipping-rates": {
      "type": "remote",
      "url": "https://onlineshippingcalculator.com/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-onlineshippingcalculator-shipping-rates --url https://onlineshippingcalculator.com/api/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-onlineshippingcalculator-shipping-rates:
    url: "https://onlineshippingcalculator.com/api/mcp"
```

### Other

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

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-03 (score 63, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-01 (score 62, +1)

No change was recorded against any check on this day. Stability & Change Management went from 17 to 20. That category is still filling its 30-day observation window: 5 days of observed history at the previous scan, 6 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-31 (score 61, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 61, −2)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-29 (score 63, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-28 (score 62, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-27 (score 61, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 61)

First indexed and scored.

## MCP tools (2)

### `get_shipping_rates` (~376 tokens)

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.

Input parameters:

- `from_zip` (string, required): Origin US ZIP code (5 digits). Quotes are US-outbound only.
- `height_in` (number): Package height in inches (optional)
- `length_in` (number): Package length in inches (optional)
- `to_country` (string): Destination country as a 2-letter ISO code (default 'US')
- `to_zip` (string, required): Destination postal code: 5-digit ZIP for US, local postal code format otherwise (e.g. M5V 2T6 for Toronto)
- `weight` (number, required): Package weight
- `weight_unit` (string): Unit for weight, 'oz' or 'lb' (default 'lb')
- `width_in` (number): Package width in inches (optional)

### `get_postage_price` (~119 tokens)

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.

Input parameters:

- `mail_class` (string, required): What is being mailed
- `ounces` (number): Weight in ounces (default 1; max 3.5 for letters, 13 for large envelopes)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-onlineshippingcalculator-shipping-rates/api-mcp#diagnostics

## Score history

- 2026-08-03: 63
- 2026-08-02: 62
- 2026-08-01: 62
- 2026-07-31: 61
- 2026-07-30: 61
- 2026-07-29: 63
- 2026-07-28: 62
- 2026-07-27: 61
- 2026-07-26: 61

## Links

- Remote endpoint: https://onlineshippingcalculator.com/api/mcp
- Website: https://onlineshippingcalculator.com/mcp
- Changelog RSS feed: https://verifymcp.io/servers/com-onlineshippingcalculator-shipping-rates/api-mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-onlineshippingcalculator-shipping-rates/api-mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/com-onlineshippingcalculator-shipping-rates/api-mcp