How to Use the Lob MCP in Claude

Q: How do I check the delivery status of a sent letter in Lob using Claude Desktop?

Run a quick query to trigger listletters or getletter with the specific ID. Your agent reads the status, tracking number, and expected delivery date directly, printing the results in your chat window.

Q: Can I design HTML mail templates with Lob and Claude Desktop?

Yes. You can use createtemplate to save a reusable HTML template directly from your chat. Your agent can write the HTML, test the merge variables, and upload it to your account in one step.

Q: How does address validation work with this MCP integration?

The server uses verifyusaddress to cross-reference addresses against delivery databases. It standardizes formatting, adds missing ZIP codes, and flags undeliverable destinations before you waste money on postage.

Mail physical letters, postcards, and checks directly from Claude Desktop without leaving your chat window.

See Vinkius in Action

Works with every AI agent you already use

…and any MCP-compatible client

MCP Servers - Free for Subscribers

Connect Lob MCP to Claude Desktop

Create your Vinkius account to connect Lob to Claude Desktop and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

GDPR Free for Subscribers

Setup Lob with Claude Desktop

Ask AI about this MCP

ChatGPT

Claude

Perplexity

Clean mailing lists with Claude Desktop

The `verify_us_address` tool checks and standardizes physical mailing addresses right inside your chat window to prevent delivery failures. You don't have to copy-paste messy customer data into a separate browser tab anymore. Just paste the raw address into your conversation, and your agent cleans it up instantly. If you only have partial information, the `autocomplete_us_address` tool fills in the missing fields on the fly. This MCP Server keeps your address book accurate before you commit to printing. You can also use `create_address` to save these verified contacts directly into your account database.

Mail letters and postcards with simple prompts

The `create_letter` tool sends physical letters to any recipient by converting your HTML templates or raw text into printed paper. You can specify color options, select mail types, and pass custom merge variables directly through your chat prompt. This means you can draft a collection notice or customer update and mail it physically in under ten seconds. For shorter messages, the `create_postcard` tool handles the printing and mailing of double-sided postcards. If you make a mistake, the `cancel_letter` tool halts production as long as the status is still processing. It's physical mail with the speed of an API.

Print and mail physical checks on demand

The `create_check` tool handles the physical printing and mailing of checks to your suppliers or customers. Your agent uses this tool to process disbursements without manual accounting software interventions. You just provide the recipient details, bank account ID, and the payment amount. Before you can send a check, you must use `create_bank_account` to register your routing and account numbers securely. The MCP Server lets you list existing accounts via `list_bank_accounts` to make sure you pull funds from the correct source.

Setup guide

Set up Lob MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The Lob MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the Lob MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under lob-mcp.

json

{
  "mcpServers": {
    "lob-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Lob. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

Why Choose Vinkius

Vinkius connects your tools to AI with real-time monitoring and automatic cost savings — all from one dashboard.

Connect Lob now

Real-time monitoring

Live

visibility into every interaction

Connect your favorite tools to your AI and see exactly what's happening — every request, every response, in real time.

Built-in savings

60%

lower AI costs

Vinkius compresses data between your apps and your AI automatically. Lower bills every month — no configuration required.

Single dashboard

One

place for every integration

Every tool your AI connects to, managed from a single screen. One account, complete control.

Common questions about Lob MCP in Claude Desktop

Run a quick query to trigger `list_letters` or `get_letter` with the specific ID. Your agent reads the status, tracking number, and expected delivery date directly, printing the results in your chat window.

Yes. You can use `create_template` to save a reusable HTML template directly from your chat. Your agent can write the HTML, test the merge variables, and upload it to your account in one step.

You need to act quickly. If you catch it while the status is still processing, you can call `cancel_letter` for letters, but postcards do not have a dedicated cancel tool in this setup, so double-check your designs with `get_postcard` before sending.

The server uses `verify_us_address` to cross-reference addresses against delivery databases. It standardizes formatting, adds missing ZIP codes, and flags undeliverable destinations before you waste money on postage.

All transit data, including bank account numbers and physical addresses handled by `create_bank_account` or `create_address`, passes through an isolated local sandbox. The MCP connection runs locally on your machine, meaning no credentials or financial details are stored on intermediate servers.

Use it with your favorite AI tools

Connect this server to Cursor, Claude, VS Code, and more.

OpenAI Agents SDK sdk-python

Google ADK sdk-python

Pydantic AI sdk-python

Vercel AI SDK sdk-typescript