Terms of Service

1. Acceptance

By creating an account or using the Captxa API, you agree to these Terms of Service. If you disagree, do not use the service.

2. The Service

Captxa provides a privacy-first, invisible CAPTCHA verification service based on Proof-of-Work cryptography, built in C on the H2O HTTP server, hosted in Nuremberg, Germany (EU).

3. Eligibility

You must be at least 16 years old and have legal capacity to enter a contract in your jurisdiction. By registering, you confirm this.

4. Account Registration

• Provide a valid email address and a secure password.
• You are responsible for maintaining the confidentiality of your API keys.
• Notify us immediately at hello@captxa.com if you suspect unauthorised access.
• One account per person or organisation; duplicate accounts may be terminated.

5. Free Tier — Hobbyist Plan

The free tier is intended for personal projects, portfolios, and open-source applications. Paid plans exist for higher-volume commercial use.

6. Acceptable Use

You agree not to:

• Use the service to protect illegal, harmful, or fraudulent websites or applications.
• Attempt to reverse-engineer, circumvent, or tamper with the Captxa verification algorithm.
• Resell or sublicense your API access to third parties without written permission.
• Deliberately cause excessive load or a denial-of-service condition against our servers.
• Generate fake verifications or fraudulently bypass your own CAPTCHA implementation.
• Use the service in violation of applicable EU law or the law of your jurisdiction.

Violations may result in immediate account suspension or termination.

7. API Rate Limits & Fair Use

Each plan has monthly verification limits. Exceeding your limit may result in throttled or rejected requests until the next cycle. We will email you when you reach 80% of your monthly quota.

8. Intellectual Property

All Captxa code, algorithms, documentation, and branding are our intellectual property. You receive a limited, non-exclusive, non-transferable licence to use the Captxa client script and API solely to verify end-users of your own applications. You may not copy, modify, or redistribute the Captxa client script or server software without explicit written permission.

9. Service Availability

We aim for high availability but make no binding uptime guarantee. Captxa currently runs on a single server in Nuremberg, Germany — we are transparent about this limitation. Planned maintenance will be announced in advance. We are not liable for damages caused by service outages.

10. Disclaimer of Warranties

The service is provided "as is" and "as available" without warranties of any kind, express or implied, including but not limited to merchantability, fitness for a particular purpose, or non-infringement. Captxa does not warrant that the service will be uninterrupted, error-free, or completely secure against all attacks.

11. Limitation of Liability

To the maximum extent permitted by applicable law, Captxa is not liable for indirect, incidental, special, consequential, or punitive damages arising from your use of the service. Our total liability shall not exceed the amount you paid in the twelve months prior to any claim. This limitation does not apply to liability for gross negligence, wilful misconduct, or personal injury caused by us.

12. Indemnification

You agree to indemnify and hold Captxa harmless from claims, damages, or expenses (including legal fees) arising from your misuse of the service or violation of these Terms.

13. Governing Law

These Terms are governed by German law and EU law. Disputes are subject to the exclusive jurisdiction of the courts of Nuremberg, Germany, unless mandatory consumer protection laws in your country require otherwise.

14. Changes to These Terms

Material changes will be notified by email at least 14 days in advance. Continued use after the effective date constitutes acceptance. You may delete your account before a change takes effect if you disagree.

15. Termination

You may delete your account at any time via the dashboard or by emailing hello@captxa.com. We may terminate accounts that violate these Terms, with or without prior notice depending on severity.