Magyar Nemzeti Bank Exchange Rate API: Official HUF Rates as JSON

The Magyar Nemzeti Bank publishes the official exchange rates that accounting, tax, and customs rules in Hungary reference — published official rates, not moving market prices. This guide shows how to pull them as JSON: via a REST endpoint or the zero-dependency magyar-nemzeti-bank-exchange-rate npm package.

What the MNB publishes

• ~34 currencies against the forint — the official daily fixing, published around 11:00 CET.
• History back to 2016 — queryable by exact date or as a time series.
• The bank's own publication date on every response, so a rate is always citable.
• No gaps to trip over — weekends and Hungarian holidays resolve to the most recent published fixing and are flagged explicitly.

The EUR/HUF fixing is the anchor — Hungary's trade is euro-denominated — and it is the rate Hungarian accounting and VAT law designates for forint conversion, which is why the MNB print, not a market feed, is what auditors expect.

Why official rates, not market rates

A live mid-market feed answers "what is EUR/HUF trading at right now?" — the right tool for checkouts and dashboards. But accountants, auditors, and tax authorities ask a different question: "which rate were you required to use for this date?" That answer comes from the Magyar Nemzeti Bank's published rates, and it never changes after publication.

Get the latest rates (REST)

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

The response is the bank's most recent published data — every rate and the publication date. The latest rates are available on every plan, including the free tier (300 requests/month, no credit card).

The npm SDK

npm install magyar-nemzeti-bank-exchange-rate

import { getRate, getLatestRates } from 'magyar-nemzeti-bank-exchange-rate';

// One pair at the official MNB rate
const pair = await getRate('EUR', 'HUF', { apiKey: 'art_live_...' });
console.log(pair.rate, pair.rate_date);

// The bank's full published table
const table = await getLatestRates({ apiKey: 'art_live_...' });
console.log(table.rate_date, table.rates.length);

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

Historical rates for an invoice date

import { getRatesForDate, getHistory } from 'magyar-nemzeti-bank-exchange-rate';

// The official rates for an invoice date — non-publication days return
// the most recent published date, flagged via published_on_requested_date.
const day = await getRatesForDate('2026-06-30', { apiKey: 'art_live_...' });

// Time series for one pair
const series = await getHistory(
  { source: 'EUR', target: 'HUF', from: '2026-01-01' },
  { apiKey: 'art_live_...' }
);

Historical dates and time series need a paid plan; the latest rates stay free.

Published vs derived pairs

If the MNB does not print a pair directly, the API resolves it from the bank's published rates — an inverse, or a cross rate via HUF — and flags it derived: true with the method used. Official and computed values are never silently mixed, which is exactly the distinction an auditor will ask about.

A decade of forint history

The series runs from 2016, from EUR/HUF around 310 through the 2022 energy-crisis spike past 430 and the partial recovery since. Every fixing along the way is the legally designated conversion rate for that date — the exact number a Hungarian VAT return or audit will ask for.

FAQ

Does the Magyar Nemzeti Bank have an official exchange rate API?

The MNB publishes its official rates on its own site, and AllRatesToday serves the same published rates as clean JSON via REST or the magyar-nemzeti-bank-exchange-rate npm package. The latest table is free.

How often do Magyar Nemzeti Bank rates update?

Once per business day, fixed around 11:00 CET. These are published official rates, not moving market prices — every API response carries the publication date so you can cite it.

Can I get the MNB rate for a past date, like an invoice date?

Yes. The /central-bank/mnb/rates-for-date endpoint returns the official rates for any archived date. Non-publication days resolve to the most recent published date and are flagged, so your audit trail stays honest. Historical dates require a paid plan; latest rates are free.