exrate API — free JSON for 9 national central banks

Public REST API at api.banks-rates.com. JSON responses, no authentication, generous per-IP rate limits, CORS open. Same data the UI uses.

Endpoints

Method	Path	Description
`GET`	`/v1/banks`	List all supported banks with metadata.
`GET`	`/v1/banks/{id}`	Per-bank detail (currencies, schedule, history range).
`GET`	`/v1/rate`	Convert amount at a bank's rate. Params: bank, date, from, to, amount.
`GET`	`/v1/cross`	Cross-rate via a bank's national currency. Params: bank, date, from, to, amount.
`GET`	`/v1/rates/series`	Historical series. Params: bank, currency, from, to (dates).
`GET`	`/v1/status`	Per-bank freshness: latest rate date, currency count, updated-at timestamp.
`GET`	`/v1/openapi.json`	Full OpenAPI 3.1 spec.

Examples

curl

curl -s "https://api.banks-rates.com/v1/rate?bank=NBP&date=2026-04-20&from=USD&to=PLN&amount=100"

Python

import requests
r = requests.get("https://api.banks-rates.com/v1/rate", params={
    "bank": "NBP", "date": "2026-04-20",
    "from": "USD", "to": "PLN", "amount": 100,
})
r.raise_for_status()
print(r.json())

JavaScript / TypeScript

const url = new URL("https://api.banks-rates.com/v1/rate");
url.searchParams.set("bank", "NBP");
url.searchParams.set("date", "2026-04-20");
url.searchParams.set("from", "USD");
url.searchParams.set("to", "PLN");
url.searchParams.set("amount", "100");
const res = await fetch(url);
const data = await res.json();

Go

req, _ := http.NewRequest("GET", "https://api.banks-rates.com/v1/rate", nil)
q := req.URL.Query()
q.Set("bank", "NBP"); q.Set("date", "2026-04-20")
q.Set("from", "USD"); q.Set("to", "PLN"); q.Set("amount", "100")
req.URL.RawQuery = q.Encode()
res, _ := http.DefaultClient.Do(req)

Why exrate API instead of going to each central bank's feed directly?

One unified JSON shape across every supported central bank — no per-bank parser needed.
Built-in previous-business-day fallback for invoicing and tax filings.
Hosted on Cloudflare's edge — sub-100ms response globally.
No XML parsing, no CSV mangling, no scraping. JSON, every endpoint.
Free for commercial use, no auth.

Frequently asked questions

Is the API free for commercial use?

Yes. The data is public-domain (central banks); our hosting and API are free. Attribution appreciated.

Is exrate an official source?

No — we re-publish official rates from the central banks. The bank itself remains the legal source. We exist to be a unified, parsable, hosted endpoint.

What's the uptime SLA?

Best-effort, on Cloudflare Workers. We've held >99.9% over recent months but offer no contractual SLA on the free tier.

What are the rate limits?

Per-IP rate limits applied at the edge. Typical app usage will not hit them. Heavy batch consumers should fan-out and cache aggressively.

How do I integrate with NBP/CNB workflows?

Hit /v1/rate with bank=NBP|CNB and your date/currency. The response shape is identical across banks — drop-in replacement for direct integrations against each central bank's feed.