Marker API
FreemiumDownNot yet verified
Searches the US Patent and Trademark Office database by trademark name, owner or serial number.
Example request
curl -s 'https://markerapi.com/api/v2/trademarks/trademark/apple/status/active/start/1/username/$API_USERNAME/password/$API_PASSWORD'
Free tier, in plain English
Free registration gives 1,000 trademark searches a month; paid plans scale from 10,000 to 10 million searches a month.
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