Privacy and cookies
Your holdings stay in your browser. Below we explain how saving, clearing and fetching prices work, and distinguish these from website statistics.
Your holdings in your browser
The coins and amounts you add, their prices and calculated values, and your selected reference year are saved in this browser. This lets you continue after closing or reloading the page. We do not store your holdings overview on our server. No account is needed.
The browser also saves previously fetched prices, your theme preference and whether amounts are hidden. This storage has no automatic expiry set by the calculator. It remains until you clear it or your browser removes it. Other people using the same browser profile may be able to see your saved overview.
Clearing your data
Use “Clear calculator data” in the calculator and confirm. This clears your overview, saved prices and selected year from this browser. The year resets to the current year. Your theme preference and the choice to hide amounts stay.
This does not remove downloaded CSV files or data in another browser or on another device. You can remove this site’s browser storage and cookies through your browser settings.
Fetching prices and downloading your overview
For a price request, our server receives the selected coin, platform and reference year. The prices are stored on our server as fixed data, fetched beforehand from Bitvavo, Coinbase, Kraken, Binance, Bitstamp and Crypto.com. Your amounts and calculated holdings values are not included in these requests.
CSV files are created in your browser. Your overview is not uploaded to generate a download. An internet connection is needed to fetch coin lists and prices that are not already available.
AI assistants in your browser
If you use an AI assistant in your browser, it can read and change your overview when you ask it to. What the assistant reads goes to the service behind that assistant, not to us.
This only works in browsers that support WebMCP. Without an assistant, nothing changes: your overview stays in your browser.
The MCP server for AI assistants
Through the MCP server at /mcp, AI assistants such as Claude, ChatGPT or Cursor can look up the prices. Our server then receives what the assistant asks for: the coin, the year, the platform and, when valuing holdings, the amounts. We use this only to calculate the answer; we do not store it and you need no account.
To limit abuse, the server keeps a one-minute count of requests per IP address in memory; it is not stored or logged. Whatever you share with the assistant also goes to that assistant’s service, which decides what happens to it, not us.
Browser storage and cookies
The calculator uses browser storage to remember your input and theme. We do not set cookies, not even for website statistics, so we never ask for consent.
Website statistics
We use Umami to measure which pages are viewed, which websites visitors come from, whether someone starts filling in the form and which links to other websites are clicked. Umami receives the page address, the referring website, your browser, operating system, device type, language and screen size, and the country and region derived from your IP address. Your coins, amounts and values are never included.
Umami runs on our own server at Hetzner in Germany; the statistics are not sent to Google or anyone else. Umami does not use cookies and does not store your IP address. To count visits, it turns your IP address and browser details into a code that changes every month, so we cannot follow you over a longer period.
Hosting and logs
The website runs on a Hetzner server in Germany. The server does not keep a log of visits or IP addresses.
We keep technical messages from the website, such as error messages, for 30 days to solve problems. Your amounts and values are not in them, because they are never sent to our server.
Who operates this website?
CryptoPeildatum is a website by Fliksemblits. For questions about this statement or the processing of your personal data, contact us at:
Under the GDPR, you can also contact us about access to, correction or deletion of personal data relating to you. An overview saved only in your browser cannot be retrieved by us; you can clear it yourself as described above.
Information about privacy rights and complaints is available from the Dutch Data Protection Authority. Privacy rights and complaints (opens in a new tab)
About the calculation
CryptoPeildatum gives an indicative value of your holdings, not a tax calculation or personal financial advice. You enter the amounts you owned yourself.
Values use, per coin, the price on the platform you choose, Bitvavo, Coinbase, Kraken, Binance, Bitstamp or Crypto.com, on 1 January at 00:00 CET (31 December 23:00 UTC), in euros. Prices on other exchanges may differ. Missing prices are excluded from the total and marked in the overview and CSV. Check the completeness of your overview and consult a tax adviser when needed.