Sources
Every number says where it came from.
Denominate never makes an estimate look like an observation. Here is what each label means, and where the series come from.
Status labels
- Observed public data: published directly by the source.
- Index-based estimate: calculated from a documented source base period and index.
- Source pipeline: deliberately withheld until the source file has been imported and checked.
- Illustrative: a prototype value, not observed history.
Where the data comes from
- Current reference rate: CoinGecko, served through a Cloudflare Worker.
- Historical bitcoin: Coin Metrics Community API, PriceUSD. Non-commercial use.
- US goods: US Bureau of Labor Statistics Average Price Data, delivered by FRED. Example series: coffee, APU0000717311.
- Foreign exchange: European Central Bank reference rates, used to build the EUR and GBP series.
How a series is built
Each monthly BLS average price is divided by the stored Coin Metrics BTC/USD close on the first calendar day of that month. Missing BLS months are linearly interpolated and flagged as estimates, never as observations. Prices published per pound are converted to the canonical kilogram (1 lb = 0.45359237 kg); stored series use canonical metric units, and display units come from a single units module.
What these numbers are not
They are reference rates, not executable prices, and not financial advice. Bitcoin is volatile. Read the two-unit comparison as a way to see change, not as a signal to act.