National Bank of Kazakhstan Exchange Rate API: Official KZT Rates as JSON

The National Bank of Kazakhstan publishes the official exchange rates that accounting, tax, and customs rules in Kazakhstan 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 nbk-exchange-rate npm package.

What the NBK publishes

• ~48 currencies against the tenge — the official daily table, from USD, EUR, and RUB (the trade anchors) to the full list.
• 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 Kazakh holidays resolve to the most recent published rates and are flagged explicitly.

The USD/KZT rate anchors the table: Kazakhstan's oil exports price in dollars, and tax and customs conversion cites the NBK official rate.

Why official rates, not market rates

A live mid-market feed answers "what is USD/KZT 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 National Bank of Kazakhstan's published rates, and it never changes after publication.

Get the latest rates (REST)

curl "https://allratestoday.com/api/v1/central-bank/nbk/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 nbk-exchange-rate

import { getRate, getLatestRates } from 'nbk-exchange-rate';

// One pair at the official NBK rate
const pair = await getRate('USD', 'KZT', { 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 'nbk-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: 'USD', target: 'KZT', 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 NBK does not print a pair directly, the API resolves it from the bank's published rates — an inverse, or a cross rate via KZT — 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.

The post-float decade

Our series starts in 2016, right in the aftermath of the August 2015 float — when the tenge was cut loose from its dollar band and went from roughly 188 to about 380 per dollar within months. Everything since — the oil-price swings, the 2022 shock, the settling into the 400s — is in the archive, one official print per day.

FAQ

Does the National Bank of Kazakhstan have an official exchange rate API?

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

How often do National Bank of Kazakhstan rates update?

Once per business day, Astana time. 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 NBK rate for a past date, like an invoice date?

Yes. The /central-bank/nbk/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.