T Bank Exchange Rate API: BTN Buy and Sell Rates as JSON

T Bank is a privately owned Bhutanese commercial bank headquartered in Thimphu. Its forex page lists TT and bank-note buying and selling rates in ngultrum for about a dozen currencies. This guide shows how to read that board as JSON: what the rates mean, how they compare with the Royal Monetary Authority of Bhutan official rate and with other banks in Bhutan, and the calls that return them.

What the T Bank board shows

• 12 currencies against the Bhutanese ngultrum: AUD, CAD, CHF, DKK, EUR, GBP, HKD, JPY, NOK, SEK, SGD and USD. Every value is BTN per 1 unit of the foreign currency.
• The telegraphic transfer pair. Bhutanese banks print TT and bank-note buying and selling rates in ngultrum for a dozen or so currencies, with the yen per 100. The ngultrum is pegged at par to the Indian rupee, so the rupee is not quoted. The Royal Monetary Authority of Bhutan official rate is shown next to each row.
• USD on 15 November 2026: T Bank bought at 94.01 and sold at 94.66 BTN, a spread of 0.69%. The Royal Monetary Authority of Bhutan official rate was 94.46, so the bank's mid sat -0.13% from it.
• The bank's own timestamp. The page prints a last-updated stamp (November 14-16, 2026 on the board above), returned as bank_updated_at next to our captured_at.
• Every day's board is kept permanently, from 14 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 tightest spreads were AUD (0.66%), EUR (0.66%), GBP (0.67%) and the widest NOK (0.81%), HKD (0.75%), SEK (0.74%). 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 T Bank and other banks in Bhutan

USD on the 3 boards AllRatesToday reads in Bhutan, all captured on 15 November 2026 (the Royal Monetary Authority of Bhutan official rate was 94.46):

T Bank had the 2nd narrowest USD spread of the 3. One call to /api/v1/bank-rates/bt 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/bt/tbankbt" \
  -H "Authorization: Bearer art_live_your_key"

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

{
  "bank": "tbankbt",
  "name": "T Bank",
  "country": "bt",
  "quote_ccy": "BTN",
  "bank_updated_at": "November 14-16, 2026",
  "basis": "Telegraphic transfer",
  "captured_at": "2026-11-15T11:16:13.637Z",
  "rates": [
    {"ccy":"AUD","buy":63.91,"sell":64.33,"mid":64.12,"spread_pct":0.655,"official":64.47,"vs_official_pct":-0.543},
    {"ccy":"CAD","buy":65.93,"sell":66.39,"mid":66.16,"spread_pct":0.695,"official":66.27,"vs_official_pct":-0.166},
    {"ccy":"CHF","buy":112.31,"sell":113.13,"mid":112.72,"spread_pct":0.727,"official":113.6,"vs_official_pct":-0.775},
    … 9 more currencies
  ],
  "disclaimer": "…",
  "attribution": { … }
}

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

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

{
  "bank": "tbankbt",
  "name": "T Bank",
  "country": "bt",
  "quote_ccy": "BTN",
  "bank_updated_at": "November 14-16, 2026",
  "basis": "Telegraphic transfer",
  "captured_at": "2026-11-15T11:16:13.637Z",
  "ccy": "USD",
  "buy": 94.01,
  "sell": 94.66,
  "mid": 94.335,
  "spread_pct": 0.689,
  "official": 94.46,
  "vs_official_pct": -0.132,
  "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 T Bank on its own website, collected by AllRatesToday",
    "bank_url": "https://tbank.bt/rates/forex-rates/",
    "url": "https://allratestoday.com/bank-exchange-rate-api/bt/tbankbt/",
    "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/bt/tbankbt?date=2026-11-14" \
  -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/bt/tbankbt/history?ccy=USD&from=2026-11-14&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' });

// T Bank's USD row
const r = await client.bankRates('bt', { bank: 'tbankbt', ccy: 'USD' });
console.log(`T Bank buys USD at ${r.buy}, sells at ${r.sell} BTN`);

// The board as it stood on a past day
const past = await client.bankRates('bt', { bank: 'tbankbt', date: '2026-11-14' });
console.log(past.snapshot_date, past.rates.length);

Python

import requests

r = requests.get(
    "https://allratestoday.com/api/v1/bank-rates/bt/tbankbt",
    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 Royal Monetary Authority of Bhutan rate is the one tax, accounting and customs rules in Bhutan name; nobody transacts at it. T Bank'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 Royal Monetary Authority of Bhutan endpoint when a rule asks for the official rate.

FAQ

Where do the T Bank rates come from?

From the bank's own public rates page (https://tbank.bt/rates/forex-rates/), read hourly. AllRatesToday does not change the numbers: each row is the buy and sell price T Bank shows, with the mid, the spread and the Royal Monetary Authority of Bhutan rate added.

Are these the official BTN exchange rates?

No. They are T Bank's retail prices for customers. The official rate in Bhutan is the Royal Monetary Authority of Bhutan 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 T Bank 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 T Bank rates for a past date?

Yes, from 14 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.