Lob MCP by usefulapi
Verify US & international addresses and send physical mail (postcards, letters, checks) via Lob.
Connect it
Settings → Connectors → Add custom connector
URL: https://lob.usefulapi.io/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://lob.usefulapi.io/mcp{
"mcpServers": {
"lob": {
"url": "https://lob.usefulapi.io/mcp"
}
}
}claude mcp add --transport http lob https://lob.usefulapi.io/mcp{
"servers": {
"lob": {
"type": "http",
"url": "https://lob.usefulapi.io/mcp"
}
}
}18 tools, verified live
lob_verify_us_addressread-onlyValidate & standardize a US address, returning deliverability, corrected components, and a confidence score. Pass either a single freeform `address` string OR structured `primary_line`/`city`/`state`/`zip_code`. Non-mutating (no mail sent). Lob API: POST /v1/us_verifications.
lob_verify_intl_addressread-onlyValidate & standardize a non-US address. `country` (2-letter ISO code) is required. Non-mutating (no mail sent). Lob API: POST /v1/intl_verifications.
lob_us_zip_lookupread-onlyReturn the cities and state associated with a US ZIP code. Non-mutating. Lob API: POST /v1/us_zip_lookups.
lob_us_autocompleteread-onlySuggest complete US addresses from a partial primary line — useful for address entry. Non-mutating. Lob API: POST /v1/us_autocompletions.
lob_list_postcardsread-onlyList sent/scheduled postcards, newest first. Lob API: GET /v1/postcards.
lob_get_postcardread-onlyRetrieve a single postcard by id, including status, PDF url, and expected delivery. Lob API: GET /v1/postcards/{id}.
lob_list_lettersread-onlyList sent/scheduled letters, newest first. Lob API: GET /v1/letters.
lob_get_letterread-onlyRetrieve a single letter by id, including status, PDF url, and tracking. Lob API: GET /v1/letters/{id}.
lob_list_checksread-onlyList sent/scheduled checks, newest first. Lob API: GET /v1/checks.
lob_get_checkread-onlyRetrieve a single check by id, including amount, status, and check number. Lob API: GET /v1/checks/{id}.
lob_list_self_mailersread-onlyList sent/scheduled self-mailers, newest first. Lob API: GET /v1/self_mailers.
lob_list_addressesread-onlyList saved address records, newest first. Lob API: GET /v1/addresses.
lob_get_addressread-onlyRetrieve a single saved address record by id. Lob API: GET /v1/addresses/{id}.
lob_list_templatesread-onlyList saved HTML templates usable as postcard/letter artwork. Lob API: GET /v1/templates.
lob_create_addresscan modifyCreate a reusable saved address record (does NOT send any mail). Returns an address id (adr_…) usable as `to`/`from` in mail tools. Lob API: POST /v1/addresses.
lob_create_postcardcan modify⚠️ SENDS A REAL POSTCARD and charges your Lob account (use a test_ key to avoid real mail/charges). `to` and `from` accept an existing address id (adr_…) or an inline address object. `front`/`back` accept an HTML string, a hosted asset URL, or a template id (tmpl_…). Cancelable only before `send_date`. Lob API: POST /v1/postcards.
lob_create_lettercan modify⚠️ SENDS A REAL LETTER and charges your Lob account (use a test_ key to avoid real mail/charges). `to`/`from` accept an address id (adr_…) or inline object. `file` accepts an HTML string, a hosted PDF/URL, or a template id (tmpl_…). `color` is required. Cancelable only before `send_date`. Lob API: POST /v1/letters.
lob_cancel_postcardcan modifyCancel a postcard before its send_date so it is never mailed (and not billed). Fails if the send window has passed. Lob API: DELETE /v1/postcards/{id}.
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