EXR USD Strength Index API
Measure broad USD movement with a transparent equal-weight geometric basket of 13 currencies covered by the same live and historical pipeline.
Dollar index chart
Choose a range. Intraday points use aligned market observations; daily points use reference observations.
No complete basket observations are available for this range.
Methodology
There is no single official standard for a broad proprietary USD strength index. This version uses AUD, CAD, CHF, EUR, GBP, JPY, MXN, NOK, NZD, PLN, SEK, SGD, and ZAR with an equal 1/13 weight for each currency.
The index is 100 at the verified 2026-01-02 reference vector. It takes the geometric mean of each foreign-currency-per-USD rate relative to that base vector, so an increase means the dollar strengthened across the basket.
Equal weights stop one currency from dominating the result and make the method easy to audit. They do not represent trade flows, reserve shares, or investable exposure.
A point is emitted only when every constituent is present. Intraday timestamps must be within 30 seconds; missing baskets remain gaps and weights are never redistributed.
Basket and weights
| Currency | EXR USD Strength Index |
|---|---|
| AUD | 7.692% |
| CAD | 7.692% |
| CHF | 7.692% |
| EUR | 7.692% |
| GBP | 7.692% |
| JPY | 7.692% |
| MXN | 7.692% |
| NOK | 7.692% |
| NZD | 7.692% |
| PLN | 7.692% |
| SEK | 7.692% |
| SGD | 7.692% |
| ZAR | 7.692% |
value(t) = 100 × exp(Σ [1/13 × ln(rateᵢ(t) / rateᵢ(2026-01-02))])Dollar index API
Use the latest endpoint for the current complete basket and the time-series endpoint for charts or analysis.
curl "https://api.exchangerate.dev/v1/indices/usd-strength"
curl "https://api.exchangerate.dev/v1/indices/usd-strength/timeseries?interval=1d&from=2026-01-02T00:00:00Z&to=2026-09-15T23:59:59Z"Sources and naming
Indicative data only. Not a settlement, execution, or trading price. exchangerate.dev methodology.