tmsearchapi.com provides instant search across 13 million+ USPTO trademark records, updated daily — by mark name, owner, or both — returning clean JSON.

Free tier, no sign-up: 20 requests per day with no API key.
Built for AI assistants: publishes its own llms.txt, OpenAPI schema, and API docs — point ChatGPT, Claude, or any agent framework at it and ask, for example, “search for marks containing BOLT and tell me who owns them.”
For developers and IP teams: integrate knockout screening into intake workflows, brand monitoring, or due diligence pipelines.

Open tmsearchapi.com

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Search our daily-refreshed USPTO trademark index below. This is the same API, running against real records.

Screening preview, limited results. For full programmatic access, see tmsearchapi.com.

A lawyer's note on screening vs. clearance

A database hit list — from this API or any search engine — is a screening tool. It will tell you about identical or similar registered marks; it will not evaluate likelihood of confusion, related goods and services, common-law uses that never registered, or registrability. Before adopting a mark or filing, a professional clearance search and opinion is the step that protects the investment.

Trademark Search API

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A lawyer's note on screening vs. clearance