Lob MCP. Automate Physical Mailings from Code
Lob MCP automates physical mailings, letting your AI agent send letters, postcards, and checks directly from code. It handles everything from address verification and cleansing to creating reusable templates and managing bank accounts for payments.
Claude 
ChatGPT 
Cursor 
Gemini 
Windsurf 
VS Code 
JetBrains 
Vercel Give Claude and any AI agent real-world access
Validate partial or full US addresses using the autocomplete_us_address tool.
Build complex, personalized letter layouts by creating reusable HTML files with the create_template tool.
Create and dispatch formal letters to recipients using the create_letter tool.
Add bank accounts with create_bank_account, then generate and mail physical payments using the create_check tool.
Save, retrieve, or delete specific addresses within your dedicated Lob address book.
Ask an AI about this
Waiting for input…
What AI agents can do with Lob: 21 Tools for Mailing and Address Management
These tools let your AI client manage every aspect of physical correspondence, from validating an address to generating a mailed check or letter.
Make your AI actually useful.
Add this MCP to Claude, Cursor, or Windsurf and your AI stops guessing. It gets real tools to look things up, take action, and handle the stuff you keep doing by hand.
Start using Lob MCPAutocomplete Us Address
Completes and refines a partial US mailing address into its full format.
Cancel Letter
Stops the production process for a letter if it hasn't entered physical...
Create Address
Adds and saves a new mailing address record into your dedicated address book.
Create Bank Account
Adds required banking details, like routing and account numbers, needed for check...
Create Check
Generates a physical payment check and sends it to the recipient using specified...
Create Letter
Designs, personalizes, and mails a full-sized letter using an HTML template to a specific recipient.
Create Postcard
Creates and sends out a physical postcard with custom front and back designs.
Create Template
Builds and saves an HTML template that you can reuse for multiple mailings (letters...
List Letters
Lists all letters ever mailed, showing status and estimated delivery dates for...
List Postcards
Displays a list of every postcard that has been created and sent out.
List Templates
Retrieves the names and details of all HTML templates you've built for mailings.
Verify Us Address
Checks if a provided US address is accurate, standardizes it, and confirms its deliverability status.
Delete Address
Removes a specific address record from your stored list of mailing addresses.
Get Address
Retrieves the full details for one particular saved address by ID.
Get Check
Fetches all payment details for a specific check using its unique tracking ID.
Get Letter
Retrieves the status and tracking information for an already sent letter by ID.
Get Postcard
Gets all details, including delivery status, for a specific postcard mailing.
Get Template
Retrieves the content and settings of a previously saved HTML template.
List Addresses
Lists all address records stored in your Lob account, allowing you to control the result count.
List Bank Accounts
Retrieves a list of all bank accounts configured for sending payments and checks.
List Checks
Provides an auditable history of every physical check that has been sent through the...
Security and governance baked right in.
Pick your AI client below to get set up. Just create a Vinkius account, subscribe, and you're instantly up and running. We handle the entire backend infrastructure, delivering out-of-the-box support for HTTPS Streamable, SSE, and OAuth2—zero messy routing required.
Claude AI
Open Claude Settings
Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
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.
Start a conversation
Open a new chat. The Lob integration is available immediately — no restart needed.
Choose How to Get Started
Build a custom MCP for your own tools, or connect a ready-made integration from our catalog.
Build Your Own
Turn any API into an MCP. Import a spec, define Agent Skills, or deploy with MCPFusion.
- Import from OpenAPI, Swagger, or YAML specs
- Create Agent Skills with progressive disclosure
- Deploy to edge with MCPFusion framework
- Built in DLP, auth, and compliance on each call
- Real time usage dashboard and cost metering
- Publish to catalog or keep private
Make Your AI Do More
Start with Lob, then connect any of our 5,200+ other servers whenever your AI needs more. One click, no limits.
- Use this MCP plus 5,200+ others, all in one place
- Add new capabilities to your AI anytime you want
- Connections are secured and governed automatically
- Track usage and costs across all your servers
- Works with Claude, ChatGPT, Cursor, and more
- New servers added to the catalog weekly
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.
VINKIUS CLOUD
Cloud Hosted
Managed infra
V8 Isolated
Sandboxed per request
Zero-Trust Proxy
No stored credentials
DLP Enforced
Policy on each call
GDPR Compliant
EU data residency
Token Compression
~60% cost reduction
The Headache of Physical Mail Management
Today, managing physical correspondence is a nightmare. You have to export your customer list, dump it into a spreadsheet to catch typos and bad formatting, then manually cross-reference that data with an address validation service, only to upload the resulting clean CSV file into the mailing platform's portal—all before you can even design the actual card or letter.
With this MCP, all of that friction disappears. Your agent handles the whole process: it verifies the addresses using `verify_us_address`, builds reusable layouts with `create_template`, and sends out everything via a single command call.
Sending Physical Mail with Lob
You no longer need to copy-paste addresses or track payment statuses across multiple systems. Your agent manages the whole cycle, from confirming details using `get_address` to generating and listing payments via `list_checks`.
The difference is control. You move from manual data entry and segmented workflows to a single, unified API call that handles the complexities of real-world logistics.
What Lob MCP does for your AI
Need to send something in the real world? This MCP lets your agent handle physical mail tasks—things like sending payroll checks or running a direct marketing campaign. Instead of manually compiling lists and dropping off stamps, you programmatically create letters, postcards, and even personalized checks. You can verify US addresses for accurate delivery using our address tools, build custom HTML templates, and manage all the necessary details right from your application logic.
Vinkius hosts this MCP, giving any compatible client access to every tool needed to automate physical correspondence in one place.
019d75c9-7ca8-732a-9dc0-72ea1c9dfa7f 
How to set up Lob MCP
The bottom line is that you write code once to manage complex, real-world mailing tasks, instead of having to follow a series of manual steps in an external portal.
First, use the autocomplete_us_address tool to verify and standardize any partial US mailing address you have.
Next, build a personalized template using create_template, then send out the mail piece—like a postcard or a letter—using its specific creation tool (e.g., create_postcard).
Finally, your agent executes the request, printing and processing the physical item for delivery within 24 hours via USPS.
Who uses Lob MCP
Anyone who sends physical communication regularly—marketing teams running direct mail campaigns, HR departments handling payroll, or operations engineers managing vendor payments. You're the person tired of exporting CSVs, cleaning data in Excel, and then uploading everything back into a specialized portal.
Runs segmented direct mail campaigns by verifying thousands of addresses using verify_us_address before mass-producing postcards or letters.
Automates payroll distribution by adding company bank details with create_bank_account and generating physical checks via create_check for employees.
Manages customer onboarding by sending welcome letters or follow-up materials programmatically, using the get_letter tool to track status.
Benefits of connecting Lob MCP
Accuracy: You eliminate mailing errors by running verify_us_address first. This ensures every address, whether it's a partial entry or an international one, is standardized and deliverable before you even start drafting.
Efficiency: Don't manually create documents for payroll. By using create_template, you build once, and then use the template with create_letter to mass-send personalized notices instantly.
Control: You maintain a clear audit trail of all transactions. Tools like list_letters and list_checks let your agent track every piece of mail's status and expected delivery date without logging into any third-party portal.
Payment Automation: Sending payments is simple. After adding vendor bank details with create_bank_account, you just need to call create_check for a physical, mailed payment within 24 hours.
Flexibility: Whether it's formal correspondence (create_letter), quick updates (create_postcard), or financial payments, this MCP handles the entire lifecycle of sending physical mail items.
Lob MCP use cases
Mass Payroll Distribution
The HR team needs to pay 500 employees. Instead of printing checks in batches and manually tracking them, your agent first uses list_bank_accounts to confirm company funds, then runs through the employee data list to execute create_check for each person, automating payment and logging every check via list_checks.
Customer Onboarding Kits
A new customer signs up. The agent uses a stored template (get_template) and calls create_letter, sending a personalized welcome kit to the verified address retrieved by autocomplete_us_address. This completes the entire onboarding sequence in one go.
Marketing Campaign Cleanup
The marketing team has an old mailing list with bad addresses. The agent runs every record through verify_us_address to cleanse the data, then uses list_addresses to confirm only valid contacts are kept for postcard campaigns.
Urgent Mail Cancellation
A customer needs a letter canceled because they moved. The agent first retrieves the mailing ID using get_letter, checks that its status is 'processing,' and then executes cancel_letter to stop production immediately.
Lob MCP tradeoffs
What to watch out for, and the recommended way to handle each one.
Using the wrong tool for data cleanup
Trying to manually update a bad address record in your database, assuming that just storing it is enough.
Always run potential addresses through verify_us_address first. This validates and standardizes the format before you use create_address or any mailing tool.
Forgetting to track mailed items
Sending a check and then having no single source of truth to prove when it was sent, who signed off on it, or if it bounced.
After creating payments, use list_checks immediately. This ensures you have an audit log with payment tracking details available instantly.
Relying on hardcoded content
Writing code that embeds the full text of a letter directly into the API call every time, which is inflexible and tedious.
Build reusable HTML layouts using create_template. Then, use the template ID when calling tools like create_letter for consistency.
When to use Lob MCP
Use this MCP if your business relies on physical communication—any time you need to send a printed letter, postcard, or check. You need programmatic control over address validation and payment execution. Don't use it if you only communicate digitally; for instance, sending an email is not covered here. If your goal is purely data storage without mailing intent, stick to simple database write APIs. However, if you have the addresses but lack verification tools, this MCP provides verify_us_address and address management (like create_address, list_addresses) that solve the 'garbage in, garbage out' problem before sending any mail.
Frequently asked questions about Lob MCP
How do I verify an address using Lob MCP? +
You use the verify_us_address tool. It standardizes and confirms deliverability for US addresses, ensuring your mailing list is accurate before sending anything.
Can I send checks with this MCP? +
Yes. First, you must use create_bank_account to add the necessary bank details. Then, calling create_check sends a physical check that gets logged in your system.
What if I need to change a letter after sending it? +
You can first retrieve the item's status using get_letter. If it hasn't been produced yet, you can use cancel_letter to halt the process immediately.
How do I manage my list of addresses? +
You can store and retrieve addresses using create_address to save them or use list_addresses to see all records. You can also clean up old data with delete_address.
Does this MCP support custom designs? +
Yes, you first build the layout using create_template, which accepts HTML code and merge variables, allowing for highly personalized mailings.
What types of physical mail can I send with Lob? +
Lob supports three main mail types: Letters (formal correspondence, invoices, notifications with customizable color, double-sided printing), Postcards (marketing campaigns, invitations, reminders in 4x6, 6x9, or 6x11 sizes), and Checks (vendor payments, payroll, refunds, rebates with customizable memo lines and company logos). All mail is printed and mailed within 24 hours via USPS.
How does Lob address verification work? +
Lob's address verification validates and standardizes addresses using USPS data. It corrects formatting, adds missing ZIP+4 codes, fixes typos, and confirms deliverability. The service returns a deliverability status: 'deliverable' (valid and deliverable), 'undeliverable' (cannot be delivered), or 'deliverable_unnecessary' (valid but additional info not needed). This reduces returned mail by up to 5% and ensures your mailings reach the correct destination.
Can I use HTML templates for personalized mailings? +
Yes! Lob supports HTML templates with merge variables using the Handlebars templating engine. Create a template with placeholders like {{name}}, {{order_number}}, {{delivery_date}}, then pass actual values when creating letters or postcards. This enables personalized, scalable direct mail campaigns. Templates are reusable and can be referenced by ID when creating mailings. You can also embed CSS styling for professional-looking mail designs.
How long does it take for mail to be delivered? +
Lob prints and mails all items within 24 hours of creation. Delivery time depends on the mail type selected: USPS First Class Mail typically delivers in 2-5 business days, while USPS Standard Mail takes 3-7 business days. You receive a tracking number for each piece of mail to monitor delivery status. Lob also provides expected delivery dates in API responses for planning purposes.