fixer - A foreign exchange rates and currency conversion API

•    Ruby

We are happy to announce the complete relaunch of fixer.io into a more stable, more secure, and much more advanced currency & exchange rate conversion API platform. While the core structure of our API remains unchanged, all users of the legacy Fixer API will be required to sign up for a free API access key and perform a few simple changes to their integration. To learn more about the changes that are required, please jump to the „Required Changes“ section below. As of March 6th 2018, the legacy Fixer API (api.fixer.io) is deprecated and a completely re-engineered API is now accessible at https://data.fixer.io/api/ The core structure of the old API has remained unchanged, and you will only need to perform a few simple changes to your integration.

fixer.io - A foreign exchange rates and currency conversion API

•    Ruby

Fixer.io is a free JSON API for current and historical foreign exchange rates published by the European Central Bank.The rates are updated daily around 4PM CET.

PalmOS Currency Converter

•    C

Adaptation of Henrique Martins Currency converter to PalmOS 5.4.x using exchange rate information from the European Central Bank, OANDA (http://www.oanda.com/currency/table) and PACIFIC (Univ. of British Columbia, Vancouver, Canada).

swap - :currency_exchange: Currency exchange rates library

•    PHP

Swap allows you to retrieve currency exchange rates from various services such as Fixer, currencylayer or 1Forge and optionally cache the results. It is integrated to other libraries like moneyphp/money and provides a Symfony Bundle and a Laravel Package. We recommend to use the services that support our project, providing a free plan up to 1,000 requests per day.

money.js - money.js is a tiny (1kb) javascript currency conversion library, for web & nodeJS

•    Javascript

Simple and tiny JavaScript library for realtime currency conversion and exchange rate calculation, from any currency, to any currency.money.js is lightweight, has no dependencies, and works great client-side or server-side. Use standalone or as a nodeJS/npm and AMD/requireJS module.

cConverter

Currency Converter is a free open source software for converting currency by the daily exchange rate. It is possible to make conversions in 35 different currencies.

money - PHP implementation of Fowler's Money pattern.

•    PHP

In short: You shouldn't represent monetary values by a float. Wherever you need to represent money, use this Money value object. Since version 3.0 this library uses strings internally in order to support unlimited integers. PHP 5.6+. Other than that, this library has no external requirements. MoneyPHP will not provide any support to PHP versions that are not supported by the language itself. There might be additional dependencies for specific feature, e.g. the Swap exchange implementation, check the documentation for more information.

Extended Currency Converter

Extended Currency Converter is an open source application. It will help you with converting amounts between 150+ different currencies (daily updated exchange rates).

XChange - Java library for interacting with 60+ Bitcoin and other crypto currency exchanges

•    Java

XChange is a Java library providing a simple and consistent API for interacting with 60+ Bitcoin and other crypto currency exchanges providing a consistent interface for trading and accessing market data.

google_currency - Ruby Money::Bank interface for the Google Currency exchange data

•    Ruby

Ruby Money::Bank interface for the Google Currency exchange data

peatio - An open-source assets exchange.

•    Ruby

Peatio is a free and open-source crypto currency exchange implementation with the Rails framework and other cutting-edge technology. Our mission is to build the world best open-source crypto currency exchange with a high performance trading engine and safety which can be trusted and enjoyed by users. Additionally we want to move the crypto currency exchange technology forward by providing support and add new features. We are helping people to build easy their own exchange around the world.

Rippled - Decentralized cryptocurrency blockchain daemon implementing the XRP Ledger in C++

•    C++

Ripple is a network of computers which use the Ripple consensus algorithm to atomically settle and record transactions on a secure distributed database, the Ripple Consensus Ledger (RCL). Because of its distributed nature, the RCL offers transaction immutability without a central operator. The RCL contains a built-in currency exchange and its path-finding algorithm finds competitive exchange rates across order books and currency pairs.

crypto-trader - :moneybag: Cryptocurrency trading bot library with a simple example strategy (trading via Gemini)

•    Python

💰 Python bindings for trading Bitcoin, Ethereum, & USD on the Gemini.com Exchange API. All currency symbols are based on the base type symbols.Currency.

JavaMoney - Money and Currency API for Java

•    Java

JavaMoney is the new monetary API for the Java Platform as well as related projects and libraries. Whereas the API (JSR 354) provides a portable and extensible API for handling of Money & Currency models, Moneta provides a production ready reference implementation.

currXchange

•    Python

currxchange is a collection of (at the moment) three python scripts which can get the current currency exchange rates from the European Central Bank's website and perform currency conversions based on the most up to date exchange rates.

Taler - Electronic payments for a liberal society

•    C

Taler is a new electronic payment system. When you pay with Taler, your identity does not have to be revealed to the merchant. The bank, government and exchange will also never learn how you spent your electronic money. However, you can prove that you paid in court if necessary.

Accounting.js - A lightweight JavaScript library for number, money and currency formatting - fully localisable, zero dependencies.

•    Javascript

accounting.js is a tiny JavaScript library for number, money and currency parsing/formatting. It's lightweight, fully localisable, has no dependencies, and works great client-side or server-side. Use standalone or as a nodeJS/npm and AMD/requireJS module.

currency.io - An offline-capable, html5 currency converter app for the iPhone

•    Javascript

An offline-capable, html5 currency converter app for the iPhone

Currency Converter

Coding4Fun Windows Phone 7 Currency Converter

currency.io - An offline-capable, html5 currency converter app for the iPhone

•    Javascript

An offline-capable, html5 currency converter app for the iPhone. Visit http://currency.io on your iOS/Android phone to try it out. To build a useful, cohesive application for your phone using web standards.