Lob MCP by usefulapi

Lob MCP by usefulapi

Verify addresses and send physical mail via Lob, from Claude, Cursor, or any MCP client. Hosted, no local install — connect with your Lob API key.

Live endpoint: https://lob.usefulapi.io/mcp · Homepage: https://usefulapi.io/lob

Connect

• Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste https://lob.usefulapi.io/mcp.
• Claude Code: claude mcp add --transport http lob https://lob.usefulapi.io/mcp, then run /mcp to log in.
• VS Code: Add to VS Code.
• Cursor and other clients: add the URL as a remote MCP server:

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

Add only the URL. Do not add an Authorization header or an API key to the client config: the server signs you in with OAuth, and the login page asks for your Lob credentials.

Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/lob/

On first connect you'll paste your Lob API key. It's validated, stored per-user, and scoped to you.

Tools

Tool	Type	What it does
lob_verify_us_address	read	Verify a US address
lob_verify_intl_address	read	Verify an international address
lob_us_zip_lookup	read	Look up a US ZIP code
lob_us_autocomplete	read	Autocomplete a US address
lob_list_postcards	read	List postcards
lob_get_postcard	read	Get a postcard
lob_list_letters	read	List letters
lob_get_letter	read	Get a letter
lob_list_checks	read	List checks
lob_get_check	read	Get a check
lob_list_self_mailers	read	List self-mailers
lob_list_addresses	read	List saved addresses
lob_get_address	read	Get a saved address
lob_list_templates	read	List templates
lob_create_address	write	Save an address record
lob_create_postcard	write	Send a postcard (COSTS MONEY)
lob_create_letter	write	Send a letter (COSTS MONEY)
lob_cancel_postcard	write	Cancel a scheduled postcard
lob_usage_status	meta	Usage status (free-tier meter)
lob_request_feature	meta	Request a missing feature
lob_upgrade	meta	Upgrade to Pro (unlimited*)
lob_cancel_subscription	meta	Cancel the Pro subscription

read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.

Pricing

Plan	Price	Limit
Free	$0	50 tool calls / month
Pro	$9/mo or $90/yr (2 months free)	Unlimited*

*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to [email protected].

Pro covers this server only. Subscribe with lob_upgrade (it returns a Stripe Checkout link). Cancel any time with lob_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running lob_upgrade before then undoes the cancel. Or write to [email protected].

License

MIT — see LICENSE. Documentation only; the server is hosted.