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Lob

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Lob MCP — US address verification, bulk verification, and autocompletion (docs.lob.com). BYO-key…

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http lob 'https://gateway.pipeworx.io/lob/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "lob": {
            "type": "http",
            "url": "https://gateway.pipeworx.io/lob/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. mcp-lob
  2. Tools
  3. Quick Start
  4. No MCP client? Call it over HTTP
  5. Standalone (no gateway account)
  6. Using with ask_pipeworx
  7. More
  8. License

mcp-lob

Lob MCP — US address verification, bulk verification, and autocompletion

Part of Pipeworx — an MCP gateway connecting AI agents to 1683+ live data sources.

Tools

ToolDescription
lob_verify_addressVerify a single US address for deliverability and return USPS-standardized/corrected components (ZIP+4, DPV codes, county, lat/lon). Pass structured components (primary_line, city, state, zip_code) OR a single freeform address string — not both. Example: lob_verify_address({ primary_line: "185 Berry St", secondary_line: "Ste 6100", city: "San Francisco", state: "CA", zip_code: "94107", _apiKey: "your-key" }) or lob_verify_address({ address: "185 Berry St Ste 6100 San Francisco CA 94107", _apiKey: "your-key" })
lob_verify_bulkVerify a list of US addresses in one request. Each address is an object with primary_line, city, state, zip_code (secondary_line/recipient optional). Returns per-address deliverability + corrected components. Example: lob_verify_bulk({ addresses: [{ primary_line: "210 King St", city: "San Francisco", state: "CA", zip_code: "94107" }], _apiKey: "your-key" })
lob_autocompleteAutocomplete a partial US address. Given a primary-line prefix (and optional city/state/zip), returns up to 10 full address suggestions. Suggestions are candidates, not guaranteed deliverable — verify with lob_verify_address. Example: lob_autocomplete({ address_prefix: "185 B", city: "San Francisco", state: "CA", _apiKey: "your-key" })

Quick Start

Add to your MCP client (Claude Desktop, Cursor, Windsurf, etc.):

{
  "mcpServers": {
    "lob": {
      "url": "https://gateway.pipeworx.io/lob/mcp"
    }
  }
}
What this endpoint actually serves

tools/list at https://gateway.pipeworx.io/lob/mcp returns the tools in the table above plus the shared Pipeworx meta-tools — ask_pipeworx, discover_tools, search_within, remember/recall and the rest of the gateway-wide set. So the tool count you see is larger than this table: a single-pack endpoint currently lists roughly 30 shared tools alongside the pack's own. The connection's initialize response states its exact scope, and is the authoritative answer for a given day.

This is deliberate, not multiplexing by accident. The meta-tools are what let a scoped connection answer a question this pack does not cover — via ask_pipeworx, which routes across the whole catalog — without you adding a second MCP server. There is currently no way to mount a pack endpoint without them; if the extra schemas cost you more context than the routing is worth, connect to the full gateway once rather than to several pack endpoints.

Or connect to the full Pipeworx gateway to get every pack's tools listed directly, instead of just this one's:

{
  "mcpServers": {
    "pipeworx": {
      "url": "https://gateway.pipeworx.io/mcp"
    }
  }
}

Both URLs reach the same gateway and the same 1683+ data sources. The only difference is which pack's tools are listed directly; ask_pipeworx reaches all of them from either one.

No MCP client? Call it over HTTP

This pack takes your own API key (_apiKey) — we don't front one for it, so there's no curl here that would run without it. Inspect any tool: GET https://gateway.pipeworx.io/v1/tools/lob_verify_address. Find one: POST https://gateway.pipeworx.io/v1/tools/search_packs with {"query":"..."}.

Standalone (no gateway account)

This package also runs as a local stdio MCP server — no Pipeworx account, no gateway round-trip:

{
  "mcpServers": {
    "lob": {
      "command": "npx",
      "args": ["-y", "@pipeworx/mcp-lob"]
    }
  }
}

Or run it directly to confirm it starts:

npx -y @pipeworx/mcp-lob

It speaks MCP over stdin/stdout and answers initialize/tools/list/tools/call for only this pack's tools — none of the shared meta-tools the gateway connection above adds. Same source, same tools, no ask_pipeworx routing.

Using with ask_pipeworx

Instead of calling tools directly, you can ask questions in plain English — this works on the pack endpoint above as well as on the full gateway:

ask_pipeworx({ question: "your question about Lob data" })

The gateway picks the right tool and fills the arguments automatically.

More

License

MIT

Frequently asked questions

What is Lob?

Lob MCP — US address verification, bulk verification, and autocompletion (docs.lob.com). BYO-key…

How do I install Lob?

It runs as a remote server. In Claude Code: claude mcp add --transport http lob 'https://gateway.pipeworx.io/lob/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Lob need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Lob open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Lob?

It is published by pipeworx-io. AI.tn lists it but does not maintain or endorse it.

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