Privacy Policy
Last updated: 2026-06-15
This Privacy Policy explains what personal data KaijiWatch (the data controller) collects and how it is handled.
1. Data we collect
We practice data minimization. We collect only:
- Email address — to deliver the newsletter and (for paid users) watchlist alerts.
- Watchlist — the tickers and investor names you choose to track, so we can filter alerts. You control this; you may use a plan that does not require a watchlist.
- Payment data — handled entirely by Stripe; we do not store card numbers. We receive only a customer identifier and subscription status from Stripe.
We do not sell personal data. The public website is a static site and uses no advertising or tracking cookies in its MVP form (any change will be reflected here).
2. Purpose and legal basis
We process your data to provide the Service you subscribed to (contractual necessity) and to send communications you opted into (consent). You can withdraw consent at any time by unsubscribing.
3. Processors
| Processor | Purpose |
|---|---|
| Buttondown (Buttondown, LLC — United States) | Email delivery and storage of the subscriber list (your email address and any watchlist you set) |
| Cloudflare, Inc. (United States) | Website hosting/CDN and DNS, and the subscription-form endpoint that passes your email to Buttondown |
| Stripe (Stripe, Inc. — United States/Ireland) | Payment processing and subscription management (paid plans only) |
4. Retention
We keep your data while your subscription is active and for up to 12 months after cancellation, then delete it; we will delete it sooner on request.
5. Your rights
You may request access to, correction of, or deletion of your personal data by emailing contact@kaijiwatch.com. We will respond within a reasonable time. For EU/UK users, you also have the right to data portability, to restrict or object to processing, and to lodge a complaint with your local supervisory authority. We honor these on a best-effort basis. (We do not actively target the EU/UK market; if our practices change, this policy will be updated.)
6. International transfers
The Service is operated from Japan. By using it, you understand your data may be processed in Japan and by the processors listed above (which may operate internationally).
7. Security
Your subscriber data (email address and any watchlist) is stored by our email provider, Buttondown, on its infrastructure; we access it only to operate the newsletter and do not keep a separate copy of the subscriber list. When you unsubscribe — one click in every email — you are removed from active sending, and on request we will delete your record from Buttondown entirely.
8. Changes
Material changes will be posted with an updated date.
9. Contact
KaijiWatch — contact@kaijiwatch.com