Privacy Policy

Last updated: 21 October 2026

Calculator inputs

The numbers you type into a calculator are sent to our server only to compute the result and are not stored, logged with your identity, or sold. There are no user accounts for visitors.

Contact form

If you send a message through the contact form, we store your name, email address, subject and message in our database so that we can read and respond to it. Contact submissions are visible only to the site administrator. Ask us via the same form if you want a submission deleted.

Crypto payments (direct, on-chain)

• Payments are made wallet-to-wallet on public blockchains, directly between your wallet and the site owner's wallet. There is no payment gateway or middleman.
• Your wallet address, the amount and the transaction ID are public on the blockchain by design and are visible to anyone.
• We store the payment record (amount, asset, network, transaction ID, status) and, only if you typed them into our forms, your name, email and note, to match and confirm your payment.
• We never receive, request or store card details, bank details, seed phrases, private keys or wallet passwords — no field on this site can accept them.
• Blockchain transactions cannot be edited or deleted by us.
• Explorer and rate providers (mempool.space, Blockscout, Coinbase rates) receive the server requests needed to verify payments and are governed by their own policies.

Cookies, analytics and advertising

We use Google Analytics 4 and Google AdSense only when they are configured by the site owner, and their cookies are set only after you accept the consent banner. If you decline, no analytics or advertising cookies are set by this site. A strictly-necessary cookie is used for the administrator login area only; it is never set for ordinary visitors.

Third parties

When enabled and consented to, Google Analytics and AdSense process data under Google's own privacy policies. We do not sell personal information to anyone.

Your choices

You can clear cookies at any time in your browser settings, which resets your consent choice. For any privacy question, contact us through the contact page.