Last updated: March 2026
MarkStalker provides trademark monitoring services by scanning USPTO filings and alerting users to potentially similar marks.
MarkStalker is not a law firm and does not provide legal advice. Similarity scores are algorithmic estimates and should not be relied upon as legal opinions. Consult a trademark attorney for legal matters.
MarkStalker uses publicly available USPTO trademark filing data. We do not guarantee completeness or timeliness of data.
Paid plans are billed monthly via Stripe. You may cancel at any time. Refunds are handled on a case-by-case basis.
Developer tier API access is subject to rate limits. API keys must not be shared. Abuse may result in key revocation.
MarkStalker is provided “as is” without warranty. We are not liable for missed filings, false positives, or decisions made based on our alerts.