BTC World Currency Strength

The twenty most-traded currencies and bitcoin, every one of them measured against the same basket. Exchange rates are ratios, so "the yen fell" means nothing until you say against what — quote it against a collapsing currency and it looks strong. Here the reference is fixed for all of them, so the lines can honestly be compared with each other, and with bitcoin.

Each currency is valued against an equal-weighted **geometric** basket of all twenty, then rebased so the first day on screen is 100. A geometric mean is symmetric — A-per-B and B-per-A give reciprocal answers — so no currency is privileged by being picked as the denominator. Bitcoin is measured against that identical basket, using our own daily close converted at the same day's ECB dollar rate.

A line **above 100** means that currency bought more of the world's other money than it did on the first day shown; **below 100** means it bought less. Because every line shares one reference, the gap between two lines is a real answer to "which of these held its value better".

Bitcoin on the same axis is the point of the chart: it is the only line here that is not a government's liability, and it moves on a completely different scale to the fiat lines — expect it to dominate the range in both directions.

Equal weighting is a deliberate choice, not a central bank's method: trade weighting would make the basket mostly dollar and quietly reintroduce the very anchor this chart removes. So this answers "which currency held value", and is **not** a substitute for an official effective exchange rate.

The **rouble is absent** — the ECB stopped publishing a reference rate for it in March 2022, so a complete top-twenty is not possible from this source, and inventing one is not an option.

The ECB fixes rates **once per business day** around 16:00 CET, so this is a daily series with weekend and holiday gaps; it is not an intraday FX feed. Rebasing to the first visible day means the numbers change when you change the range — that is how index charts work. And a currency can look strong simply because the rest of the basket weakened.

European Central Bank daily reference rates (via frankfurter.dev) · business-daily, history from 1999-01-04 · bitcoin from our own warehouse price, converted at the same day's ECB dollar rate