3 Banka Exchange Rate API: RSD Buy and Sell Rates as JSON

3 Banka is a Serbian bank based in Novi Sad (formerly Opportunity banka). Its home page lists the euro’s non-cash and cash buy and sell rates in dinars. This guide shows how to read that board as JSON: what the rates mean, how they compare with the National Bank of Serbia official rate and with other banks in Serbia, and the calls that return them.

What the 3 Banka board shows

• 1 currency against the Serbian dinar: EUR. Every value is RSD per 1 unit of the foreign currency.
• The devize (non-cash) buy / sell pair. Serbian banks publish a daily list with a non-cash (devizni) pair for transfers and accounts and a cash (efektiva) pair for notes, around the National Bank of Serbia’s middle rate. The rates here are the non-cash pair. The National Bank of Serbia official rate is shown next to each row.
• EUR on 15 November 2026: 3 Banka bought at 116.15 and sold at 119.09 RSD, a spread of 2.50%. The National Bank of Serbia official rate was 117.62, so the bank's mid matched it.
• The bank's own timestamp. The page prints a last-updated stamp (2026-11-13 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 spread was EUR 2.50%. 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.

EUR at 3 Banka and other banks in Serbia

EUR on the 15 boards AllRatesToday reads in Serbia, all captured on 15 November 2026 (the National Bank of Serbia official rate was 117.62):

3 Banka had the 7th narrowest EUR spread of the 15. One call to /api/v1/bank-rates/rs 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/rs/trecabankars" \
  -H "Authorization: Bearer art_live_your_key"

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

{
  "bank": "trecabankars",
  "name": "3 Banka",
  "country": "rs",
  "quote_ccy": "RSD",
  "bank_updated_at": "2026-11-13",
  "basis": "Devize (non-cash) buy / sell",
  "captured_at": "2026-11-15T11:23:32.315Z",
  "rates": [
    {"ccy":"EUR","buy":116.15,"sell":119.0906,"mid":117.6203,"spread_pct":2.5,"official":117.6203,"vs_official_pct":0}
  ],
  "disclaimer": "…",
  "attribution": { … }
}

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

curl "https://allratestoday.com/api/v1/bank-rates/rs/trecabankars?ccy=EUR" \
  -H "Authorization: Bearer art_live_your_key"

{
  "bank": "trecabankars",
  "name": "3 Banka",
  "country": "rs",
  "quote_ccy": "RSD",
  "bank_updated_at": "2026-11-13",
  "basis": "Devize (non-cash) buy / sell",
  "captured_at": "2026-11-15T11:23:32.315Z",
  "ccy": "EUR",
  "buy": 116.15,
  "sell": 119.0906,
  "mid": 117.6203,
  "spread_pct": 2.5,
  "official": 117.6203,
  "vs_official_pct": 0,
  "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 3 Banka on its own website, collected by AllRatesToday",
    "bank_url": "https://www.3bank.rs/",
    "url": "https://allratestoday.com/bank-exchange-rate-api/rs/trecabankars/",
    "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/rs/trecabankars?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/rs/trecabankars/history?ccy=EUR&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' });

// 3 Banka's EUR row
const r = await client.bankRates('rs', { bank: 'trecabankars', ccy: 'EUR' });
console.log(`3 Banka buys EUR at ${r.buy}, sells at ${r.sell} RSD`);

// The board as it stood on a past day
const past = await client.bankRates('rs', { bank: 'trecabankars', 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/rs/trecabankars",
    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 Serbia rate is the one tax, accounting and customs rules in Serbia name; nobody transacts at it. 3 Banka'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 Serbia endpoint when a rule asks for the official rate.

FAQ

Where do the 3 Banka rates come from?

From the bank's own public rates page (https://www.3bank.rs/), read hourly. AllRatesToday does not change the numbers: each row is the buy and sell price 3 Banka shows, with the mid, the spread and the National Bank of Serbia rate added.

Are these the official RSD exchange rates?

No. They are 3 Banka's retail prices for customers. The official rate in Serbia is the National Bank of Serbia 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 3 Banka 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 3 Banka 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=EUR&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.