U.S. Department of the Treasury Exchange Rate API

Official U.S. Department of the Treasury (United States) quarterly exchange rates as JSON: 187 currencies, history back to 2001. The published USD rates required for tax, audits, and compliant invoicing.

U.S. Department of the Treasury official quarterly exchange rates as JSON: 187 currencies against the USD, history back to 2001. Latest table on every plan. Get your API key.

About U.S. Department of the Treasury

The U.S. Department of the Treasury publishes the Treasury Reporting Rates of Exchange each quarter, through its Bureau of the Fiscal Service. Every US government agency must use these rates to convert foreign-currency balances into dollars for official reports — and contractors, grant recipients, and auditors follow the same table. Rates are amended mid-quarter when a currency moves sharply.

• Official website: www.treasury.gov
• Official rate publication: Treasury Reporting Rates of Exchange

Quick start

One request for the pair you need — USD to EUR at the official U.S. Department of the Treasury rate:

curl "https://allratestoday.com/api/v1/central-bank/ustreasury/latest?source=USD&target=EUR" \
  -H "Authorization: Bearer art_live_your_key"

Or the bank's full published table:

curl "https://allratestoday.com/api/v1/central-bank/ustreasury/latest" \
  -H "Authorization: Bearer art_live_your_key"

On paid plans, any historical date or a time series:

curl "https://allratestoday.com/api/v1/central-bank/ustreasury/history?source=USD&target=EUR&from=2025-01-01" \
  -H "Authorization: Bearer art_live_your_key"

Latest published rates (2026-07-15)

The most recent table as published by U.S. Department of the Treasury — exactly what the /latest endpoint returns right now. Values are USD per 1 unit of each currency:

Base	Quote	Type	Rate
USD	VEF	quarterly	248832
USD	AFN	quarterly	65.09
USD	ALL	quarterly	82.4
USD	DZD	quarterly	132.906
USD	AOA	quarterly	912.048
USD	XCD	quarterly	2.7
USD	ARS	quarterly	1495
USD	AMD	quarterly	370
USD	AUD	quarterly	1.451
USD	AZN	quarterly	1.7
USD	BSD	quarterly	1
USD	BHD	quarterly	0.377
USD	BDT	quarterly	123
USD	BBD	quarterly	2.02
USD	BYN	quarterly	2.907
USD	BZD	quarterly	2
USD	XOF	quarterly	571.5
USD	BMD	quarterly	1
USD	BAM	quarterly	1.716
USD	BWP	quarterly	12.821
USD	BRL	quarterly	5.174
USD	BND	quarterly	1.295
USD	BGN	quarterly	0.87
USD	KHR	quarterly	4020.5
USD	XAF	quarterly	575.55
USD	CAD	quarterly	1.424
USD	CVE	quarterly	96.77
USD	KYD	quarterly	0.82
USD	CLP	quarterly	921.6
USD	CNY	quarterly	6.785
USD	COP	quarterly	3449.19
USD	KMF	quarterly	431.3
USD	CRC	quarterly	451.95
USD	CUC	quarterly	1
USD	CUP	quarterly	24
USD	XCG	quarterly	1.78
USD	EUR	quarterly	0.877
USD	CZK	quarterly	20.716
USD	CDF	quarterly	2277
USD	DKK	quarterly	6.558
USD	DJF	quarterly	177
USD	DOP	quarterly	59.36
USD	EGP	quarterly	49.18
USD	ERN	quarterly	15
USD	SZL	quarterly	16.368
USD	ETB	quarterly	158.48
USD	FJD	quarterly	2.22
USD	GMD	quarterly	72
USD	GEL	quarterly	2.607
USD	GHS	quarterly	11.3
USD	GTQ	quarterly	7.62
USD	GNF	quarterly	8733
USD	GYD	quarterly	215
USD	HTG	quarterly	130.252
USD	HNL	quarterly	26.668
USD	HKD	quarterly	7.842
USD	HUF	quarterly	312.34
USD	ISK	quarterly	126.22
USD	INR	quarterly	94.66
USD	IDR	quarterly	17870.69
USD	IRR	quarterly	1375055
USD	IQD	quarterly	1309.55
USD	ILS	quarterly	2.977
USD	JMD	quarterly	159
USD	JPY	quarterly	162.38
USD	JOD	quarterly	0.708
USD	KZT	quarterly	478.11
USD	KES	quarterly	129.35
USD	KRW	quarterly	1550.88
USD	KWD	quarterly	0.308
USD	KGS	quarterly	87.45
USD	LAK	quarterly	22320
USD	LBP	quarterly	89500
USD	LSL	quarterly	16.368
USD	LRD	quarterly	181
USD	LYD	quarterly	6.413
USD	MGA	quarterly	4180
USD	MWK	quarterly	1751
USD	MYR	quarterly	4.082
USD	MVR	quarterly	15.42
USD	MRU	quarterly	39.9
USD	MUR	quarterly	47.04
USD	MXN	quarterly	17.454
USD	MDL	quarterly	17.51
USD	MNT	quarterly	3579
USD	MAD	quarterly	9.375
USD	MZN	quarterly	63.3
USD	MMK	quarterly	3668
USD	NAD	quarterly	16.368
USD	NPR	quarterly	151.46
USD	NZD	quarterly	1.767
USD	NIO	quarterly	36.6
USD	NGN	quarterly	1380.08
USD	NOK	quarterly	9.916
USD	OMR	quarterly	0.385
USD	PKR	quarterly	277.7
USD	PGK	quarterly	4.228
USD	PYG	quarterly	6069.32
USD	PEN	quarterly	3.414
USD	PHP	quarterly	61.322
USD	PLN	quarterly	3.768
USD	QAR	quarterly	3.64
USD	MKD	quarterly	53.86
USD	RON	quarterly	4.6
USD	RUB	quarterly	78.5
USD	RWF	quarterly	1450
USD	STN	quarterly	21.501
USD	SAR	quarterly	3.75
USD	RSD	quarterly	102.89
USD	SCR	quarterly	13.756
USD	SLE	quarterly	24.6
USD	SGD	quarterly	1.295
USD	SBD	quarterly	7.8
USD	SOS	quarterly	568
USD	ZAR	quarterly	16.368
USD	SSP	quarterly	4800
USD	LKR	quarterly	336
USD	SDG	quarterly	3550
USD	SRD	quarterly	37.325
USD	SEK	quarterly	9.725
USD	CHF	quarterly	0.809
USD	SYP	quarterly	112.5
USD	TWD	quarterly	31.834
USD	TJS	quarterly	9.22
USD	TZS	quarterly	2610
USD	THB	quarterly	33.2
USD	TOP	quarterly	2.327
USD	TTD	quarterly	6.749
USD	TND	quarterly	2.934
USD	TRY	quarterly	46.656
USD	TMT	quarterly	3.491
USD	UGX	quarterly	3660
USD	UAH	quarterly	44.735
USD	AED	quarterly	3.673
USD	GBP	quarterly	0.756
USD	UYU	quarterly	40.12
USD	UZS	quarterly	12000
USD	VUV	quarterly	118.3
USD	VND	quarterly	26255
USD	WST	quarterly	2.672
USD	YER	quarterly	528
USD	ZMW	quarterly	18
USD	ZWG	quarterly	25.833
USD	BOB	quarterly	10.35
USD	BIF	quarterly	3443
USD	VES	quarterly	723.933

Node.js / TypeScript client

A dedicated zero-dependency npm package wraps these endpoints — ustreasury-exchange-rate:

npm install ustreasury-exchange-rate

import { getRate } from 'ustreasury-exchange-rate';

const pair = await getRate('USD', 'EUR', { apiKey: 'art_live_...' });
console.log(pair.rate, pair.rate_date);

Zero dependencies, TypeScript types included, and it runs anywhere fetch exists — Node 18+, Bun, Deno, and edge runtimes.

Why use the official U.S. Department of the Treasury rate?

Live market rates move continuously, but tax filings, customs declarations, audits, and statutory accounting in United States and beyond typically require the official rate published by U.S. Department of the Treasury for a given date — a fixed, citable number that never changes after publication. This API serves those published tables with the bank's own rate_date on every response; weekends and holidays return the most recent published date, which is the rate compliance rules require you to apply.

Pairs the bank doesn't print directly are resolved from its table (inverse or cross via USD) and explicitly flagged "derived": true — so what the bank printed and what was computed are never confused.

Endpoints

• GET /api/v1/central-bank/ustreasury/latest — latest table or single pair (all plans)
• GET /api/v1/central-bank/ustreasury/{YYYY-MM-DD} — the table for any date (paid plans)
• GET /api/v1/central-bank/ustreasury/history — time series, up to 5,000 rows (paid plans)
• GET /api/v1/central-bank/ustreasury/availability — publication calendar: the dates the bank actually published (all plans)

Full parameter reference in the API documentation. Every request counts toward your plan's monthly quota — rates change once a quarter, so caching a published table locally makes a small quota go far.

Frequently asked questions

Is there an API for U.S. Department of the Treasury exchange rates?

Yes — this one. Official quarterly USD rates as clean JSON, latest table on every plan including free.

How often are the rates updated?

U.S. Department of the Treasury publishes quarterly — one official table per quarter, amended mid-quarter when a currency moves sharply; the API ingests each new table shortly after publication (latest: 2026-07-15).

Are these the official rates?

Yes — ingested from U.S. Department of the Treasury's own published data, served unmodified with the bank's publication date. Anything computed rather than published is flagged derived.

Other tax authorities

All covered tax authoritiesCoverage, endpoints, and plans HM Revenue & CustomsUnited Kingdom — official GBP rates Central bank rates APIOfficial rates from 34 central banks