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Privacy Policy

Last updated: March 22, 2026

1. Operator

JapanCost is operated by Byron Corporation (合同会社バイロン), registered in Japan.

2. Data We Collect

2.1 Website Visitors

We use Google Analytics to collect anonymous usage data including:

  • Pages visited and time spent
  • Browser type and device information
  • Approximate geographic location (country/region level)
  • Referral source

This data is anonymized and cannot be used to identify individual users.

2.2 API Users

If you register for an API key, we collect:

  • Email address
  • API usage logs (endpoints called, timestamps)
  • Payment information (processed securely by Stripe)

3. How We Use Your Data

  • To provide and improve the Service
  • To process API subscriptions and payments
  • To send service-related notifications
  • To analyze usage patterns and improve user experience

We do not sell your personal data to third parties.

4. Third-Party Services

We use the following third-party services:

5. Cookies

We use cookies for analytics purposes through Google Analytics. These cookies help us understand how visitors interact with our website. You can disable cookies through your browser settings.

6. Data Retention

Analytics data is retained for 14 months. API user account data is retained for the duration of your account plus 30 days after deletion. Payment records are retained as required by Japanese tax law.

7. Your Rights

You have the right to:

  • Request access to your personal data
  • Request correction or deletion of your data
  • Opt out of analytics tracking
  • Request data portability

To exercise these rights, contact us at contact@japancost.jp.

8. International Users

Our servers are located in the Asia-Pacific region (Tokyo). If you access the Service from outside Japan, your data may be transferred to and processed in Japan. By using the Service, you consent to this transfer.

9. Changes to This Policy

We may update this Privacy Policy from time to time. We will notify users of significant changes by posting a notice on the website.

10. Contact

Byron Corporation (合同会社バイロン)
Email: contact@japancost.jp