EXR USD Strength Index API

Name: EXR USD Strength Index API
Creator: exchangerate.dev
License: https://exchangerate.dev/terms

101.884

-0.344 (-0.34%)

EXR USD Strength Index · 2026-10-14 04:33:59 UTC

Sep 14Sep 21Sep 29Oct 6Oct 13

How do I query USD Strength Index?

One authenticated GET returns the latest value with its timestamp and source. Swap the language tab for your stack.

$ curl https://api.exchangerate.dev/v1/indices/usd-strength \
    -H "Authorization: Bearer $API_KEY"
# → value, data_updated_at, source

const r = await fetch("https://api.exchangerate.dev/v1/indices/usd-strength", {
  headers: { Authorization: `Bearer ${API_KEY}` }
}).then(res => res.json())
console.log(r.value, r.data_updated_at, r.source)

r = requests.get(
    "https://api.exchangerate.dev/v1/indices/usd-strength",
    headers={"Authorization": f"Bearer {API_KEY}"},
).json()
print(r["value"], r["data_updated_at"], r["source"])

✓The response includes the index value, its weights, source, and data_updated_at.

Get API key

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%

Formula

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

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.