Lob MCP by usefulapi MCP Server

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answering

Lob MCP by usefulapi is answering right now. Last checked 8 min ago. It exposes 18 tools. Last commit 2 Nov 2026.

Verify US & international addresses and send physical mail (postcards, letters, checks) via Lob.

Uptime history 91 days of history · worst day 0%

91 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

154 ms

Response time

average over 24h

Stars

last commit 2 Nov 2026

What changed 54

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 30 September 2026. No other catalogue keeps this.

2 Nov a tool changed version

31 Oct a tool changed version4 times that day

30 Oct a tool changed version2 times that day

29 Oct a tool changed version2 times that day

28 Oct a tool changed version2 times that day

27 Oct a tool changed version

26 Oct 2 tools changed the parameters they ask for lob_create_letter, lob_create_postcard

26 Oct a tool description was rewritten lob_create_letter

26 Oct a tool changed version

25 Oct a tool changed version4 times that day

and 43 more, back to 30 September 2026

What the code does

We read the source, 22 h ago · tools taken from the live server · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Page executes code built at runtime portal/index.html:250

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Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 8 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add lob --transport http https://lob.usefulapi.io/mcp

Settings → Connectors → Add custom connector, then paste this address

https://lob.usefulapi.io/mcp

~/.codex/config.toml

[mcp_servers.lob]
url = "https://lob.usefulapi.io/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "lob": {
      "url": "https://lob.usefulapi.io/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "lob": {
      "type": "http",
      "url": "https://lob.usefulapi.io/mcp"
    }
  }
}

Available tools 18

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

lob

lob_cancel_postcard

Cancel a postcard before its send_date so it is never mailed (and not billed). Fails if the send window has passed. Lob API: DELETE /v1/postcards/{id}.

lob_create_address

Create a reusable saved address record (does NOT send any mail). Returns an address id (adr_…) usable as `to`/`from` in mail tools. Lob API: POST /v1/addresses.

lob_create_letter

⚠️ SENDS A REAL LETTER and charges your Lob account (use a test_ key to avoid real mail/charges). `to`/`from` accept an address id (adr_…) or inline object. `file` accepts an HTML string, a hosted PDF/URL, or a template id (tmpl_…). `color` is required. Cancelable only before `send_date`. Tracked mail: `extra_service` = certified (U.S. addresses: tracking + proof of delivery), certified_return_receipt (certified + the recipient's electronic signature) or registered (international addresses only); extra cost, first class only, not for us_legal size. The tracking number is on the letter (lob_get_letter). Lob API: POST /v1/letters.

lob_create_postcard

⚠️ SENDS A REAL POSTCARD and charges your Lob account (use a test_ key to avoid real mail/charges). `to` and `from` accept an existing address id (adr_…) or an inline address object. `front`/`back` accept an HTML string, a hosted asset URL, or a template id (tmpl_…). Cancelable only before `send_date`. Lob API: POST /v1/postcards.

lob_get_address

Retrieve a single saved address record by id. Lob API: GET /v1/addresses/{id}.

lob_get_check

Retrieve a single check by id, including amount, status, and check number. Lob API: GET /v1/checks/{id}.

lob_get_letter

Retrieve a single letter by id, including status, PDF url, and tracking. Lob API: GET /v1/letters/{id}.

lob_get_postcard

Retrieve a single postcard by id, including status, PDF url, and expected delivery. Lob API: GET /v1/postcards/{id}.

lob_list_addresses

List saved address records, newest first. Lob API: GET /v1/addresses.

lob_list_checks

List sent/scheduled checks, newest first. Lob API: GET /v1/checks.

lob_list_letters

List sent/scheduled letters, newest first. Lob API: GET /v1/letters.

lob_list_postcards

List sent/scheduled postcards, newest first. Lob API: GET /v1/postcards.

lob_list_self_mailers

List sent/scheduled self-mailers, newest first. Lob API: GET /v1/self_mailers.

lob_list_templates

List saved HTML templates usable as postcard/letter artwork. Lob API: GET /v1/templates.

lob_us_autocomplete

Suggest complete US addresses from a partial primary line — useful for address entry. Non-mutating. Lob API: POST /v1/us_autocompletions.

lob_us_zip_lookup

Return the cities and state associated with a US ZIP code. Non-mutating. Lob API: POST /v1/us_zip_lookups.

lob_verify_intl_address

Validate & standardize a non-US address. `country` (2-letter ISO code) is required. Non-mutating (no mail sent). Lob API: POST /v1/intl_verifications.

lob_verify_us_address

Validate & standardize a US address, returning deliverability, corrected components, and a confidence score. Pass either a single freeform `address` string OR structured `primary_line`/`city`/`state`/`zip_code`. Non-mutating (no mail sent). Lob API: POST /v1/us_verifications.

Endpoints

URL	Transport	State	Latency	Checked
https://lob.usefulapi.io/mcp	streamable-http	answering	77 ms	8 min ago

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Lob MCP by usefulapi — questions

Answers built from our own checks of this server.

What can Lob MCP by usefulapi do?

It exposes 18 tools, read directly from the server on our last check. Among them: lob_cancel_postcard, lob_create_address, lob_create_letter, lob_create_postcard, lob_get_address, lob_get_check and 12 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Lob MCP by usefulapi working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 154 ms. The bar chart above shows every period we have measured.

How do I connect Lob MCP by usefulapi?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Lob MCP by usefulapi need an API key?

No. Lob MCP by usefulapi completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 18 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Lob MCP by usefulapi?

It answers our handshake in 154 ms on average, which is faster than 82% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Lob MCP by usefulapi open source?

The code is open source: it is published under the MIT licence, written in JavaScript, 1 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at lob.usefulapi.io, which runs on its operator's own terms.