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API · /treasuryfx-api

US Treasury Rates of Exchange API

healthy 4,176 Subscribers

The official US government foreign-exchange rates, served live from the US Treasury's FiscalData API — no key, nothing cached. These are the rates the federal government uses to convert foreign-currency balances into US dollars for reporting, and US companies use them for tax and compliance; they are published every quarter for around 168 currencies and go back two decades. The rates endpoint returns the whole quarterly set — every country and currency with its rate to one US dollar (the euro near 0.87, the yen near 159) — and accepts a date to pull any past quarter. The currency endpoint returns one currency's official rate with its history quarter by quarter, looked up by ISO code, country or currency name. The convert endpoint turns an amount from any currency into any other, crossed through the US dollar at the official Treasury rate. Everything is the Treasury's own published data, live, nothing stored; rates are quarterly and authoritative for accounting, not a live market quote. This is the official FX layer for any accounting, tax-compliance, treasury, government-contracting or historical-FX app. Distinct from central-bank and market FX APIs — this is the US Treasury's quarterly reporting rates of exchange. 4 endpoints, no key on our side.

#treasury #forex #official-fx #accounting #compliance #exchange-rates #usd #historical-fx
api.oanor.com/treasuryfx-api
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Machine-readable spec so AI agents can integrate this API.

/api/treasuryfx-api/openapi.json
/api/treasuryfx-api/llms.txt

Discovery: GET /api/index.json lists every API.

US Treasury Rates of Exchange API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
576 ms
Server probes · 24h
Subscribers
4,176
active
Total calls
80
last 7 days
status Full status page → · 16 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 2,200 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 2,200 calls/month
  • 2 req/sec
  • Rates, currency, convert
  • No credit card
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Starter

€9.00 /month

  • 32,000 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 32,000 calls/month
  • 6 req/sec
  • Quarterly history + historical FX
  • Email support
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Pro

€25.00 /month

  • 175,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 175,000 calls/month
  • 15 req/sec
  • Accounting & compliance pipelines
  • Priority support
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Mega

€60.00 /month

  • 920,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 920,000 calls/month
  • 40 req/sec
  • Enterprise & ERP scale
  • Dedicated SLA
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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for US Treasury Rates of Exchange API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call US Treasury Rates of Exchange API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for US Treasury Rates of Exchange API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does US Treasury Rates of Exchange API cost?
US Treasury Rates of Exchange API has a free tier with 100 calls / month. Paid plans start at €9.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is US Treasury Rates of Exchange API GDPR-compliant?
All requests to US Treasury Rates of Exchange API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/treasuryfx-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/treasuryfx-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/treasuryfx-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/treasuryfx-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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