Dollar Index API and DXY formula reconstruction

Name: Dollar Index API and DXY formula reconstruction
Creator: exchangerate.dev
License: https://exchangerate.dev/terms

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Six-currency reconstruction · 2026-10-14 08:03:59 UTC

Sep 14Sep 21Sep 29Oct 6Oct 13

How do I query DXY reconstruction?

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/dxy-reconstructed \
    -H "Authorization: Bearer $API_KEY"
# → value, data_updated_at, source

const r = await fetch("https://api.exchangerate.dev/v1/indices/dxy-reconstructed", {
  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/dxy-reconstructed",
    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

This endpoint uses EUR, JPY, GBP, CAD, SEK, and CHF with the published basket weights and formula constant. Because exchangerate.dev stores every component as foreign currency units per USD, the implementation uses the algebraically equivalent positive exponents in that orientation.

The result is an independent reconstruction. It is not official ICE data, an ICE settlement value, or a licensed DXY feed. Small differences from a displayed market index can result from observation timing, source methodology, rounding, and market conventions.

Use it when you need a transparent six-currency dollar basket that can be reproduced from its inputs. The response includes each constituent rate, weight, timestamp, and log contribution.

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	Six-currency reconstruction
EUR	57.6%
JPY	13.6%
GBP	11.9%
CAD	9.1%
SEK	4.2%
CHF	3.6%

Formula

value(t) = 50.14348112 × EUR^0.576 × JPY^0.136 × GBP^0.119 × CAD^0.091 × SEK^0.042 × CHF^0.036

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/dxy-reconstructed/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. ICE U.S. Dollar Index FAQ · exchangerate.dev methodology.