How to Use the Lob MCP in Claude

Q: How do I install the Lob MCP Server on Claude Desktop?

Open your claudedesktopconfig.json file and add the server configuration under the mcpServers key. Restart the Claude Desktop app, and you will see the tools ready to use in your chat input.

Q: Can Claude Desktop verify international addresses using Lob?

Yes, Claude Desktop calls verifyintladdress to validate global locations. Your agent handles the formatting automatically based on the country's local postal rules.

Q: How does Lob track sent postcards in Claude Desktop?

Your agent runs listpostcards to find your sent mailings. It then uses getmailtracking to show you the exact transit milestones directly in your Claude Desktop chat.

Q: Can I send HTML postcards with this setup?

Yes, you can pass raw HTML or PDF URLs to createpostcard. The server processes the files and prints them on heavy cardstock with high-quality finishes.

Send physical mail, checks, and postcards directly from Claude Desktop using real-world address verification.

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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.

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Setup Lob with Claude Desktop

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Verify physical addresses inside Claude Desktop

Claude Desktop uses this MCP Server to clean up your mailing list before you waste money on postage. When you paste raw address data into your chat, your agent calls `verify_us_address` or `verify_intl_address` to fix typos, add missing ZIP codes, and format everything to postal standards. If you are typing out a partial address, the agent uses `autocomplete_address` to suggest the correct location in real-time. You get clean, deliverable addresses saved straight to your local environment without opening a browser.

Print and mail letters directly from your chat

Stop logging into web portals just to send a notification. This integration lets Claude Desktop trigger physical mailings using this MCP Server via `create_letter` with custom inserts or certified mail options. You can ask your agent to pull a draft from your local files, format it as a PDF, and send it out. Use `list_letters` to check what went out yesterday without leaving your terminal or chat window.

Issue physical checks and postcards on the fly

Send high-impact mailers or pay vendors directly from Claude Desktop. Your agent triggers `create_postcard` using HTML templates you write in chat, and issues bank-ready checks with `create_check` when you need them. Once sent, you do not have to guess when they arrive. Ask your agent to run `get_mail_tracking` to pull real-time USPS delivery updates directly into your active sidebar.

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-alternative-mcp.

json

{
  "mcpServers": {
    "lob-alternative-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.

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Common questions about Lob MCP in Claude Desktop

Open your `claude_desktop_config.json` file and add the server configuration under the `mcpServers` key. Restart the Claude Desktop app, and you will see the tools ready to use in your chat input.

Yes, Claude Desktop calls `verify_intl_address` to validate global locations. Your agent handles the formatting automatically based on the country's local postal rules.

Your agent runs `list_postcards` to find your sent mailings. It then uses `get_mail_tracking` to show you the exact transit milestones directly in your Claude Desktop chat.

Yes, you can pass raw HTML or PDF URLs to `create_postcard`. The server processes the files and prints them on heavy cardstock with high-quality finishes.

Your recipient names, mailing addresses, and bank routing numbers are processed locally on your machine via stdio transport. Vinkius runs the MCP Server in an isolated sandbox, meaning your sensitive financial data never leaks to external third-party logs.

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