The Currency Exchange API is a service that provides real-time exchange rate information from 19 supported currencies, allowing developers to add dynamic values for exchange rates into their software applications. It uses the Simple Object Access Protocol (SOAP) and returns prices in plain text over XML. The API has low latency and a 100% uptime score, making it suitable for financial applications, Forex trading, travel websites, and stock market blog publications. Developers can use geolocation information from the web browser to further customize results for local users. The service is free to use through RapidAPI with an API key, and code snippets are available for PHP, Python, Ruby, JavaScript, and other languages.