Shipping Rates & Postage Calculator
REMOTE · ONLINESHIPPINGCALCULATOR.COM · SCANNED SEP 25
Live USPS, UPS & FedEx shipping rates plus USPS postage and stamp prices. Free, no API key.
Available components
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. How we score → Why this is hard to score →
Endpoint Security57
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- 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. See how to fix → View diagnostics → Unverified
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability67
- AI-judged instruction clarity (excellent).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 2 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 3 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
How do I install the Shipping Rates & Postage Calculator MCP server?
Shipping Rates & Postage Calculator is a hosted endpoint at https://onlineshippingcalculator.com/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · onlineshippingcalculator.com
claude mcp add --transport http com-onlineshippingcalculator-shipping-rates 'https://onlineshippingcalculator.com/api/mcp'
{
"mcpServers": {
"com-onlineshippingcalculator-shipping-rates": {
"url": "https://onlineshippingcalculator.com/api/mcp"
}
}
} {
"servers": {
"com-onlineshippingcalculator-shipping-rates": {
"type": "http",
"url": "https://onlineshippingcalculator.com/api/mcp"
}
}
} [mcp_servers.com-onlineshippingcalculator-shipping-rates] url = "https://onlineshippingcalculator.com/api/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"com-onlineshippingcalculator-shipping-rates": {
"type": "remote",
"url": "https://onlineshippingcalculator.com/api/mcp",
"enabled": true
}
}
} openclaw mcp add com-onlineshippingcalculator-shipping-rates --url 'https://onlineshippingcalculator.com/api/mcp' --transport streamable-http
mcp_servers:
com-onlineshippingcalculator-shipping-rates:
url: "https://onlineshippingcalculator.com/api/mcp" {
"McpServers": {
"com-onlineshippingcalculator-shipping-rates": {
"Transport": "http",
"Url": "https://onlineshippingcalculator.com/api/mcp"
}
}
} assistant mcp add com-onlineshippingcalculator-shipping-rates -t streamable-http -u 'https://onlineshippingcalculator.com/api/mcp'
{
"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.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 25 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 26 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 25 Aug 26 0
- Stability: 0.97 → pass security
- 11 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 31 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 30 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 27 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 26 Jul 26 0
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 25 Sept 2026 · Probed https://onlineshippingcalculator.com/api/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=onlineshippingcalculator.com | CN=WE1,O=Google Trust Services,C=US | 1 Sept 2026 | 30 Nov 2026 | ECDSA 256 | ECDSA-SHA256 | 5d77d32dee3520810e92a0c8609220a5 |
| SANs: onlineshippingcalculator.com | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of onlineshippingcalculator.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| onlineshippingcalculator.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://onlineshippingcalculator.com/api/mcp | Verified | 200 | |
| http (plaintext) | http://onlineshippingcalculator.com/api/mcp | HTTPS enforced | 301 | https://onlineshippingcalculator.com/api/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
get_postage_price Get USPS postage price ~119
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.
| Name | Type | Req | Description |
|---|---|---|---|
| mail_class | string | yes | What is being mailed |
| ounces | number | – | Weight in ounces (default 1; max 3.5 for letters, 13 for large envelopes) |
No output schema declared.
No examples provided.
get_shipping_rates Get package shipping rates ~376
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.
| Name | Type | Req | Description |
|---|---|---|---|
| from_zip | string | yes | 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 | yes | Destination postal code: 5-digit ZIP for US, local postal code format otherwise (e.g. M5V 2T6 for Toronto) |
| weight | number | yes | Package weight |
| weight_unit | string | – | Unit for weight, 'oz' or 'lb' (default 'lb') |
| width_in | number | – | Package width in inches (optional) |
No output schema declared.
No examples provided.
What is the Shipping Rates & Postage Calculator MCP server?
Shipping Rates & Postage Calculator is an MCP server listed in the public MCP registry as com.onlineshippingcalculator/shipping-rates. Live USPS, UPS & FedEx shipping rates plus USPS postage and stamp prices. Free, no API key. This page covers its hosted endpoint (https://onlineshippingcalculator.com/api/mcp).
Is the Shipping Rates & Postage Calculator MCP server safe to use?
Shipping Rates & Postage Calculator scores 75 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Shipping Rates & Postage Calculator MCP server expose?
Shipping Rates & Postage Calculator exposes 2 tools: get_shipping_rates, get_postage_price. Their descriptions and schemas cost roughly 495 tokens of context every time the server is loaded.
Does the Shipping Rates & Postage Calculator MCP server require authentication?
No. We connected to Shipping Rates & Postage Calculator without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Shipping Rates & Postage Calculator MCP server still maintained?
Shipping Rates & Postage Calculator is still listed as active in the MCP registry. We last reached this channel on 25 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.