data as of August 12, 2026

Our method

Where the numbers come from, how they are computed, and what happens when something changes.

Sources

Daily USD price history since 2010
api.blockchain.info, average across major exchanges, daily close
Daily EUR/USD rate
api.frankfurter.app, European Central Bank reference rates
Current price
api.coingecko.com
Block height, difficulty, fees, mempool, hashrate
mempool.space

Calculations

N-day moving average
Simple arithmetic mean of the last N daily closes.
Mayer multiple
Current price divided by the 200-day moving average.
Next halving date
Blocks remaining until the next multiple of 210,000, at one block every ten minutes.
Circulating supply
Sum of block rewards per 210,000-block era, up to the current height. Lost coins are not deducted.
Overlaid cycles
Each cycle is aligned on its halving date and rebased to 100, then shown on a logarithmic scale.
Investment simulator
The amount is applied on the first day of each month, at that day's close, with no fees or taxes.

Reuse

The charts and figures on 21radar are free to reuse, including commercially. The site name printed on the image is enough attribution: no link is required and no permission needs to be asked. The data is published under a Creative Commons BY 4.0 licence, and this page stands as explicit permission to attribute by the mention “21radar.com” alone.

Updates

Data is fetched automatically every three hours and committed to the project repository. Every update therefore leaves a timestamped trace: no past figure can be altered without it showing.

Every number on 21radar comes from a public source and is recomputed from verifiable data. This page says which ones, and how. If a method ever changes, the change will be written here and dated.