Bank of China (Thai) Exchange Rate API: THB Buy and Sell Rates as JSON

Bank of China (Thai) Public Company Limited is the Thai subsidiary of Bank of China, locally incorporated in 2014. Its rate table lists telegraphic-transfer and cash buying and selling rates against the baht for about 16 currencies, with the time of each update. Shares the Bank of China group rate-frame platform (bankofchina.com/sourcedb/). This guide shows how to read that board as JSON: what the rates mean, how they compare with the Bank of Thailand official rate and with other banks in Thailand, and the calls that return them.

What the Bank of China Thai board shows

• 16 currencies against the Thai baht: AUD, CAD, CHF, CNY, DKK, EUR, GBP, HKD, IDR, JPY, MYR, NOK, NZD, SEK, SGD and USD. Every value is THB per 1 unit of the foreign currency.
• The telegraphic transfer buy / sell pair. Thai banks print several buying rates per currency (bank notes, cheques and telegraphic transfers) and one selling rate, and they update the board several times a day; small notes of the US dollar get a lower rate than 50 and 100 notes. The rates here are the telegraphic-transfer buying rate and the transfer selling rate. The Bank of Thailand official rate is shown next to each row.
• USD on 15 November 2026: Bank of China Thai bought at 33.74 and sold at 34.04 THB, a spread of 0.89%. The Bank of Thailand official rate was 34.0385, so the bank's mid sat -0.44% from it.
• The bank's own timestamp. The page prints a last-updated stamp (2026-11-15 00:00:01 on the board above), returned as bank_updated_at next to our captured_at.
• Every day's board is kept permanently, from 15 November 2026, the day collection started. 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 CHF (0.69%), HKD (0.83%), USD (0.89%) and the widest IDR (9.90%), NZD (2.74%), AUD (2.52%). 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 Bank of China Thai and other banks in Thailand

USD on the 11 boards AllRatesToday reads in Thailand, all captured on 15 November 2026 (the Bank of Thailand official rate was 34.0385):

Bank of China Thai had the 5th narrowest USD spread of the 11. One call to /api/v1/bank-rates/th 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/th/bocth" \
  -H "Authorization: Bearer art_live_your_key"

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

{
  "bank": "bocth",
  "name": "Bank of China (Thai)",
  "country": "th",
  "quote_ccy": "THB",
  "bank_updated_at": "2026-11-15 00:00:01",
  "basis": "Telegraphic transfer buy / sell",
  "captured_at": "2026-11-15T11:37:51.465Z",
  "rates": [
    {"ccy":"AUD","buy":22.684,"sell":23.264,"mid":22.974,"spread_pct":2.525,"official":23.4438,"vs_official_pct":-2.004},
    {"ccy":"CAD","buy":23.758,"sell":23.998,"mid":23.878,"spread_pct":1.005,"official":24.0106,"vs_official_pct":-0.552},
    {"ccy":"CHF","buy":40.3983,"sell":40.6783,"mid":40.5383,"spread_pct":0.691,"official":40.7865,"vs_official_pct":-0.609},
    … 13 more currencies
  ],
  "disclaimer": "…",
  "attribution": { … }
}

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

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

{
  "bank": "bocth",
  "name": "Bank of China (Thai)",
  "country": "th",
  "quote_ccy": "THB",
  "bank_updated_at": "2026-11-15 00:00:01",
  "basis": "Telegraphic transfer buy / sell",
  "captured_at": "2026-11-15T11:37:51.465Z",
  "ccy": "USD",
  "buy": 33.74,
  "sell": 34.04,
  "mid": 33.89,
  "spread_pct": 0.885,
  "official": 34.0385,
  "vs_official_pct": -0.436,
  "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 Bank of China (Thai) on its own website, collected by AllRatesToday",
    "bank_url": "https://www.bankofchina.com/sourcedb/thb/",
    "url": "https://allratestoday.com/bank-exchange-rate-api/th/bocth/",
    "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/th/bocth?date=2026-11-15" \
  -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/th/bocth/history?ccy=USD&from=2026-11-15&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' });

// Bank of China (Thai)'s USD row
const r = await client.bankRates('th', { bank: 'bocth', ccy: 'USD' });
console.log(`Bank of China Thai buys USD at ${r.buy}, sells at ${r.sell} THB`);

// The board as it stood on a past day
const past = await client.bankRates('th', { bank: 'bocth', date: '2026-11-15' });
console.log(past.snapshot_date, past.rates.length);

Python

import requests

r = requests.get(
    "https://allratestoday.com/api/v1/bank-rates/th/bocth",
    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 Bank of Thailand rate is the one tax, accounting and customs rules in Thailand name; nobody transacts at it. Bank of China Thai'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 Bank of Thailand endpoint when a rule asks for the official rate.

FAQ

Where do the Bank of China (Thai) rates come from?

From the bank's own public rates page (https://www.bankofchina.com/sourcedb/thb/), read hourly. AllRatesToday does not change the numbers: each row is the buy and sell price Bank of China Thai shows, with the mid, the spread and the Bank of Thailand rate added.

Are these the official THB exchange rates?

No. They are Bank of China Thai's retail prices for customers. The official rate in Thailand is the Bank of Thailand 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 Bank of China Thai 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 Bank of China Thai rates for a past date?

Yes, from 15 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.