twrate 0.5.0

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twrate

A Python package for querying real-time exchange rates from major Taiwanese banks.

Overview

twrate provides a simple and efficient way to retrieve up-to-date currency exchange rates from Taiwanese banks using asynchronous fetchers and concurrent fan-out. Currently, it supports the following banks:

• Bank of Taiwan (台灣銀行)
• DBS Bank Taiwan (星展銀行)
• Sinopac Bank (永豐銀行)
• E.SUN Bank (玉山銀行)
• Line Bank (LINE Bank)
• HSBC Bank Taiwan (匯豐銀行)
• Next Bank (將來銀行)
• KGI Bank (凱基銀行)
• Cathay United Bank (國泰世華銀行)
• Mega International Commercial Bank (兆豐銀行)
• First Bank (第一銀行)
• Land Bank (土地銀行)
• Yuanta Bank (元大銀行)
• Taishin Bank (台新銀行)
• Taichung Bank (台中銀行)
• Co-operative Bank (合作金庫)
• Fubon Bank (台北富邦銀行)

Installation

pip install twrate

Requires Python 3.12+. For local development, prefer uv (e.g., uv sync to install and uv run twrate USD to execute the CLI inside the managed environment).

Usage

Basic Usage

import asyncio

from rich import print

from twrate import Exchange
from twrate import fetch_rates


async def main():
    for exchange in Exchange:
        rates = await fetch_rates(exchange)
        print(rates)


if __name__ == "__main__":
    asyncio.run(main())

Or fetch rates from all exchanges concurrently:

import asyncio

from twrate import Exchange
from twrate import fetch_rates


async def main():
    # Fetch all rates concurrently
    tasks = [fetch_rates(exchange) for exchange in Exchange]
    results = await asyncio.gather(*tasks, return_exceptions=True)

    all_rates = []
    for exchange, result in zip(Exchange, results, strict=False):
        if isinstance(result, Exception):
            print(f"Error fetching {exchange.value}: {result}")
        else:
            all_rates.extend(result)

    return all_rates


if __name__ == "__main__":
    rates = asyncio.run(main())
    print(rates)

Command-Line Interface

You can also use twrate directly from the command line:

# Query exchange rates for USD from all supported banks (installed via pip)
twrate USD

# Run inside the uv-managed environment when developing locally
uv run twrate USD

# Or run without installing into the current environment
uvx twrate USD

Example output:

Exchange          Spot Buy    Spot Sell    Cash Buy    Cash Sell
--------------  ----------  -----------  ----------  -----------
BANK_OF_TAIWAN      30.095       30.245      29.77        30.44
DBS                 30.076       30.279      29.863       30.47
SINOPAC             30.092       30.203      29.892       30.403
ESUN                30.1         30.2        29.85        30.4

Rate Information

The Rate object provides the following information:

• exchange: The bank code (e.g., "BOT" for Bank of Taiwan, "DBS" for DBS Bank)
• source: The source currency code
• target: The target currency code (always "TWD")
• spot_buy: The bank's buying rate for spot transactions
• spot_sell: The bank's selling rate for spot transactions
• cash_buy: The bank's buying rate for cash transactions
• cash_sell: The bank's selling rate for cash transactions
• spot_mid: A calculated property that returns the mid-rate between spot buy and sell
• cash_mid: A calculated property that returns the mid-rate between cash buy and sell
• spot_spread: Relative spread for spot transactions
• cash_spread: Relative spread for cash transactions
• symbol: Formatted currency pair string (e.g., USD/TWD)

License

See the LICENSE file for details.

Contributing

Contributions are welcome! The package currently supports Bank of Taiwan, DBS Bank, Sinopac Bank, E.SUN Bank, Line Bank, HSBC Bank, Next Bank, KGI Bank, Cathay United Bank, Mega International Commercial Bank, First Bank, Land Bank, Yuanta Bank, Taishin Bank, Taichung Bank, Co-operative Bank, and Fubon Bank; you can help extend the functionality to cover more Taiwanese banks.

Development

• Run tests

uv run pytest -v -s --cov=src tests

TODO

Support for additional Taiwanese banks:

• 兆豐銀行 (Mega International Commercial Bank) - https://www.megabank.com.tw/personal/savings/foreign-service/forex
• 第一銀行 (First Bank) - https://www.firstbank.com.tw/sites/fcb/touch/1565688252532
• 土地銀行 (Land Bank) - https://rate.landbank.com.tw/zh-TW/Foreign?mid=35
• 元大銀行 (Yuanta Bank) - https://www.yuantabank.com.tw/bank/exchangeRate/hostccy.do
• 台新銀行 (Taishin Bank) - https://www.taishinbank.com.tw/TSB/personal/deposit/lookup/realtime/
• 台中銀行 (Taichung Bank) - https://rate.tcbbank.com.tw/CB501014.html
• 合作金庫 (Co-operative Bank) - https://www.tcb-bank.com.tw/personal-banking/deposit-exchange/exchange-rate/spot
• 台北富邦銀行 (Fubon Bank) - https://www.fubon.com/banking/personal/deposit/exchange_rate/exchange_rate_tw.htm