FreeTrademarkAPI docs · Launching Q1 2027

Free US Trademark API for bots and developers

Free US trademark knockout search via API, with optional filing and support filings with attorney review. This documentation is for agents, automation, and product teams — not a consumer search UI.

What you can do

Knockout search

Trademark + class → available / not available. Free. API key required. US only.

File a new trademark

Bot collects data + human contact email; US attorney reviews; X402 where applicable.

Support filings

Statements of use, renewals, office actions, abandonments, and assignments via API + X402.

Filing rules this product follows

USPTO regulations ban AI bots from accessing the USPTO online filing system. FreeTrademarkAPI never has bots file directly at USPTO; a US trademark attorney reviews and files where required.
Applicants outside the US must hire a US-licensed attorney to file US trademarks.
Knockout is not full clearance. Read knockout vs clearance.

Next steps

Read Feature 1: knockout search
Agents: authentication and X402 payments
Talk to the firm → US trademark attorney review and hello@markavo.com