About the project
onlytwenty.one makes Bitcoin tangible in numbers: calculators, live network data and statistics from our own price database since 2010. Everything is EUR-native, cookieless and free of paywalls; we compute every number deterministically, with no AI-generated content.
What you find here
Live dashboard & network
In real time: price, block height, hashrate, mempool, fees and Fear & Greed.
Calculators
DCA, what-if, BTC/sats/EUR/USD converter and a fee calculator.
Our own statistics
Technical analysis, cycles & signals (RSI bottom, seasonality, power-law), sats purchasing power, price history since 2010, volatility clock, whale tracker.
EUR-native & cookieless
Euro as a first-class currency, no cookies, no paywalls, no ads.
Data & methodology
The Bitcoin price comes from exchanges (Coinbase, CoinGecko) but is fully stored on our side: over 1.5M records at 5-minute resolution since 2012, plus daily data from 2010. Network data comes from our own node; inflation and gold are external reference. Every source and its cadence is documented under "About the data", and how each metric is computed under "Methodology".
Privacy & transparency
01Cookieless
No cookies, no cross-device tracking. Language/currency choice lives in localStorage only.
02No personal data
We store no personal information about visitors.
03Self-hosted analytics
Anonymous stats via Anonyze on our own servers. No Google Analytics, no cross-device tracking.
04No ads, no data sales
No advertising, no selling of user data.
05Hosting in Europe
GDPR-compliant, data processing in the EU.
Who runs this
onlytwenty.one is operated and maintained by a single person. The imprint names that person openly, with a full address. Questions or corrections are welcome at hello [at] onlytwenty.one.