USPTO trademark search API

What you get

• US trademark applications and registrations matching a wordmark
• Serial number, mark, owner, status (live or dead), filing and registration dates
• Nice classes and a link to the USPTO TSDR record

Parameters

• qstringrequiredquery

  Wordmark

  2–200 characters

• statuslive | dead | alloptionalquery

  Live, dead or all marks

  default live

• limitintegeroptionalquery

  Maximum number of marks

  1 to 25 · default 10

• matchall | anyoptionalquery

  Require all words or any word

  default all

Try it

curl "https://402check.com/v1/us/trademark?q=acme"

Example response

[
  {
    "serial": "77724923",
    "mark": "ACME",
    "owner": "Acme Products Company (CORPORATION; MISSOURI, USA)",
    "status": "live",
    "filed": "2009-04-29",
    "registered": "2010-04-06",
    "classes": [
      "012"
    ],
    "url": "https://tsdr.uspto.gov/#caseNumber=77724923&caseType=SERIAL_NO&searchType=statusSearch"
  }
]

First of 3 live marks our test fixture returns.

HTTP

curl "https://402check.com/v1/us/trademark?q=acme"

curl -H "Authorization: Bearer rk_YOUR_KEY" "https://402check.com/v1/us/trademark?q=acme"

MCP

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "us_trademark",
    "arguments": {
      "q": "acme"
    }
  }
}

Endpoint https://402check.com/mcp. Setup for Cursor, Claude and other clients is in the docs.

Source and limits

Data from USPTO Trademark Search.

• US marks only
• The USPTO search backend is undocumented and can change without notice (then 502 upstream_error, not charged)
• At most 25 marks per call; match=all requires every word, match=any accepts any

Questions