Alfa-Bank Belarus Exchange Rate API: BYN Buy and Sell Rates as JSON

Alfa-Bank Belarus is a Belarusian commercial bank. Its public partner API lists buying and selling rates in Belarusian rubles for the US dollar, euro and Russian ruble, plus cross rates. This guide shows how to read that board as JSON: what the rates mean, how they compare with the National Bank of the Republic of Belarus official rate and with other banks in Belarus, and the calls that return them.

What the Alfa-Bank BY board shows

• 3 currencies against the Belarusian ruble: EUR, RUB and USD. Every value is BYN per 1 unit of the foreign currency.
• The exchange buy / sell pair. Belarusian banks quote the US dollar, euro and Russian ruble (per 100) in Belarusian rubles, with separate branch-cash and card rates that change during the day. The National Bank of the Republic of Belarus official rate is shown next to each row.
• USD on 15 November 2026: Alfa-Bank BY bought at 2.95 and sold at 3.05 BYN, a spread of 3.33%. The National Bank of the Republic of Belarus official rate was 3.0026, so the bank's mid sat -0.09% from it.
• The bank's own timestamp. The page prints a last-updated stamp (13.11.2026 on the board above), returned as bank_updated_at next to our captured_at.
• Every day's board is kept permanently, from 13 November 2026. Read one past day with ?date=, or a range for one currency with the /history endpoint (paid plans).

Spreads across the board

On the 15 November 2026 board the spreads were USD 3.33%, RUB 5.48%, EUR 5.97%. Spread is (sell − buy) ÷ mid: what a round trip through the bank costs, before any fees. The API returns it on every row as spread_pct, so you can rank currencies or alert when a bank widens its board.

USD at Alfa-Bank BY and other banks in Belarus

USD on the 7 boards AllRatesToday reads in Belarus, all captured on 15 November 2026 (the National Bank of the Republic of Belarus official rate was 3.0026):

Alfa-Bank BY had the 7th narrowest USD spread of the 7. One call to /api/v1/bank-rates/by returns every board in the table at once.

Get the board (REST)

You need an API key; the free key works. The full board:

curl "https://allratestoday.com/api/v1/bank-rates/by/alfabankby" \
  -H "Authorization: Bearer art_live_your_key"

What comes back (the 15 November 2026 board, first three rows):

{
  "bank": "alfabankby",
  "name": "Alfa-Bank Belarus",
  "country": "by",
  "quote_ccy": "BYN",
  "bank_updated_at": "13.11.2026",
  "basis": "Exchange buy / sell",
  "captured_at": "2026-11-15T11:46:04.600Z",
  "rates": [
    {"ccy":"EUR","buy":3.25,"sell":3.45,"mid":3.35,"spread_pct":5.97,"official":3.3312,"vs_official_pct":0.564},
    {"ccy":"RUB","buy":0.0355,"sell":0.0375,"mid":0.0365,"spread_pct":5.479,"official":0.036423000000000004,"vs_official_pct":0.211},
    {"ccy":"USD","buy":2.95,"sell":3.05,"mid":3,"spread_pct":3.333,"official":3.0026,"vs_official_pct":-0.087}
  ],
  "disclaimer": "…",
  "attribution": { … }
}

One currency, with the row fields at the top level:

curl "https://allratestoday.com/api/v1/bank-rates/by/alfabankby?ccy=USD" \
  -H "Authorization: Bearer art_live_your_key"

{
  "bank": "alfabankby",
  "name": "Alfa-Bank Belarus",
  "country": "by",
  "quote_ccy": "BYN",
  "bank_updated_at": "13.11.2026",
  "basis": "Exchange buy / sell",
  "captured_at": "2026-11-15T11:46:04.600Z",
  "ccy": "USD",
  "buy": 2.95,
  "sell": 3.05,
  "mid": 3,
  "spread_pct": 3.333,
  "official": 3.0026,
  "vs_official_pct": -0.087,
  "disclaimer": "Retail buy/sell rates as displayed on each bank’s own website at capture time, quoted as home currency per 1 unit of foreign currency. Indicative only: banks change these through the day, apply them at the counter or in-app, and they are not official or reference rates. For the rate a regulation names, use the central-bank endpoints.",
  "attribution": {
    "source": "Board rates published by Alfa-Bank Belarus on its own website, collected by AllRatesToday",
    "bank_url": "https://www.alfabank.by/currencies/",
    "url": "https://allratestoday.com/bank-exchange-rate-api/by/alfabankby/",
    "terms": "Public pages that show the rates need a visible link to allratestoday.com"
  }
}

The board as it stood on a past day:

curl "https://allratestoday.com/api/v1/bank-rates/by/alfabankby?date=2026-11-13" \
  -H "Authorization: Bearer art_live_your_key"

One currency over a date range, one row per day (paid plans; add &format=csv, xml or xlsx for a file):

curl "https://allratestoday.com/api/v1/bank-rates/by/alfabankby/history?ccy=USD&from=2026-11-13&to=2026-11-15" \
  -H "Authorization: Bearer art_live_your_key"

JavaScript

npm install @allratestoday/sdk

import { AllRatesToday } from '@allratestoday/sdk';

const client = new AllRatesToday({ apiKey: 'art_live_your_key' });

// Alfa-Bank Belarus's USD row
const r = await client.bankRates('by', { bank: 'alfabankby', ccy: 'USD' });
console.log(`Alfa-Bank BY buys USD at ${r.buy}, sells at ${r.sell} BYN`);

// The board as it stood on a past day
const past = await client.bankRates('by', { bank: 'alfabankby', date: '2026-11-13' });
console.log(past.snapshot_date, past.rates.length);

Python

import requests

r = requests.get(
    "https://allratestoday.com/api/v1/bank-rates/by/alfabankby",
    headers={"Authorization": "Bearer art_live_your_key"},
    timeout=10,
)
r.raise_for_status()
for row in r.json()["rates"]:
    print(row["ccy"], row["buy"], row["sell"], row["spread_pct"])

Board rate or official rate?

The National Bank of the Republic of Belarus rate is the one tax, accounting and customs rules in Belarus name; nobody transacts at it. Alfa-Bank BY's board is the price a customer actually gets. The API puts both on every row: official is the central bank's rate for the same currency and vs_official_pct is how far the bank's mid sits from it. Use the board to show customers a real price, compare banks for a remittance, or keep a dated record of what the bank quoted; use the National Bank of the Republic of Belarus endpoint when a rule asks for the official rate.

FAQ

Where do the Alfa-Bank Belarus rates come from?

From the bank's own public rates page (https://www.alfabank.by/currencies/), read hourly. AllRatesToday does not change the numbers: each row is the buy and sell price Alfa-Bank BY shows, with the mid, the spread and the National Bank of the Republic of Belarus rate added.

Are these the official BYN exchange rates?

No. They are Alfa-Bank BY's retail prices for customers. The official rate in Belarus is the National Bank of the Republic of Belarus rate, which the API returns as official on each row where the central bank has one, and in full from the central-bank endpoint.

How often is the Alfa-Bank BY board updated?

AllRatesToday reads the page every hour. The bank's own last-updated stamp is returned as bank_updated_at, so you can tell a fresh read of an unchanged board from a new board.

Can I get Alfa-Bank BY rates for a past date?

Yes, from 13 November 2026 onward; every day's board is kept permanently. Add ?date=YYYY-MM-DD for one day: the response is the board captured that day, or the nearest earlier day within five days, with date_requested and snapshot_date added. For a range, /history?ccy=USD&from=…&to=… returns one row per day as JSON, CSV, XML or XLSX on paid plans.

Do I need an API key?

Yes. Commercial bank boards need an API key; any plan works, the free key included, and each call counts against the plan. Public pages or widgets that show the rates need a visible link to allratestoday.com.