Bangladesh Bank Exchange Rate API: Official BDT Rates as JSON

The Bangladesh Bank publishes the official exchange rates that accounting, tax, and customs rules in Bangladesh 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 bangladesh-bank-exchange-rate npm package.

What the Bangladesh Bank publishes

• USD/BDT in three numbers — the highest and lowest interbank rates at the Dhaka close, and the WAR (weighted average rate) of the day’s interbank deals, which is the single figure Bangladeshi filings quote.
• Ten more currencies against the taka — EUR, GBP, AUD, JPY, CAD, SEK, SGD, CNH, INR and LKR, bid and ask, covering the trade and remittance corridors that matter to Bangladesh.
• History since 2010, every published business day, 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 — the Friday-Saturday Dhaka weekend and Bangladeshi public holidays resolve to the most recent published table and are flagged explicitly.

These are interbank rates reported to Bangladesh Bank by the dealer banks, not an administered fixing and not a retail board rate. That is what makes them the reference an import LC, a customs assessment or a statutory account is converted at — and why they are worth pulling from the source rather than from a market feed.

Why official rates, not market rates

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

Get the latest rates (REST)

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

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

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

Sixteen years of the taka’s slide

Our archive opens in November 2010, when a dollar bought 70.70 taka, and runs to today across 3,800 publication days. It covers the 2011–12 slide past 80, the long managed plateau, the 2022 balance-of-payments squeeze that took USD/BDT from 86.20 in April to the mid-90s by July, and the sharpest single move in the series: on 8 May 2024 Bangladesh Bank switched to a crawling peg and the interbank rate went from 110.00 to 116.46 overnight — a 5.9% devaluation in one publication day. When an audit asks which rate applied on an invoice date, the answer is one API call away, on either side of a break like that.

FAQ

Does the Bangladesh Bank have an official exchange rate API?

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

How often do Bangladesh Bank rates update?

Once per business day. Bangladesh Bank compiles the interbank bid, ask and weighted average after the Dhaka close and publishes them the same evening; the cross rates are based on the New York and Dhaka closes of that day. Note that the Bangladeshi week runs Sunday to Thursday, so Friday and Saturday carry no new table.

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

Yes. The /central-bank/bb/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.