Software development, and financial technology, having real-time access to exchange rate APIs is critical for many applications. Whether you’re developing a financial app, eCommerce platform, or simply need to integrate exchange rates into your system, choosing the right API can make or break the accuracy and efficiency of your project. In this article, we’ll discuss the Top 5 Best Free Exchange Rate APIs for Developers in 2025 to help you get real-time exchange rates, historical data, and more in the most efficient way possible.
1. Exchangeratesapi io – The Open Source Currency Converter API
One of the most popular and free exchange rate APIs, Exchangeratesapi io provides accurate, up-to-date exchange rates and supports over 170 currencies. As an open source currency converter API, developers appreciate its flexibility and ease of use. It offers both historical and real-time data, making it suitable for a wide range of applications. If you’re looking for a free currency conversion API that provides straightforward JSON currency exchange rates with no complexity, this is an ideal choice.
The exchange rate JSON API allows developers to pull real-time rates and historical rates going back several years. It’s perfect for those needing access to historical exchange rates API and developers needing to integrate money exchange API features seamlessly into their projects.
2. CurrencyLayer – Real-Time Forex Exchange Rates API
CurrencyLayer is another highly recommended option for developers looking for a free FX rate API. It delivers real-time forex rates and currency exchange rate API information for over 160 currencies. It is known for its high accuracy, making it one of the most accurate currency converters available. For developers who need reliable data for trading or financial forecasting, CurrencyLayer is an excellent option, offering both free and premium versions.
CurrencyLayer’s API for currency exchange rates supports JSON format, so developers can easily integrate it into any platform or application. With the free version, you can access a limited number of API calls per month, making it a great option for smaller projects and startups.
3. Open Exchange Rates – Best Free Currency API for Historical Data
For developers interested in building a robust application that requires historical monetary conversion, Open Exchange Rates is one of the top solutions. It offers real-time data for more than 170 currencies and provides up to 10 years of historical exchange rates data. This free foreign exchange rates API supports multiple formats, including JSON currency exchange rates, which makes it developer-friendly.
Open Exchange Rates is often cited as the best free currency converter API because of its focus on historical data. If you need a historical exchange rate API for applications like accounting software or trading platforms that require long-term exchange rate trends, this API should be at the top of your list.
4. Fixer io – Accurate Currency Data API for Real-Time Forex Rates
Fixer io is a well-known name in the exchange rate API space, offering both free and paid tiers for developers. This real-time currency rates API free option provides exchange rate data updated every 60 seconds, making it a perfect choice for applications that require real-time forex rates. The exchange rate API JSON output is ideal for developers who want to integrate live currency data without worrying about complex data structures.
With support for over 170 currencies, Fixer io is among the best currency APIs for developers needing frequent updates. The free tier offers up to 100 API requests per month, making it ideal for small businesses or developers working on side projects. Moreover, its currency converter with historical rates feature allows users to access data going back several years.
5. ExchangeRate-API com – Best Free Exchange Rate API for Simplicity
For developers looking for a free exchange rates API that focuses on simplicity, ExchangeRate-API com is a go-to choice. It offers a currency exchange rates API with support for over 150 currencies. Its straightforward API currency exchange service includes real-time and historical data, making it perfect for developers who want to minimize complexity.
ExchangeRate-API com is a great option for developers who need a currency conversion API for tasks like invoicing, pricing adjustments, or online purchases that involve multiple currencies. Its no-frills approach and reliable data make it one of the top free currency exchange rate APIs for beginners and experienced developers alike.
Conclusion
Choosing the right exchange rate API is crucial for developers working on projects that require accurate and real-time currency data. Whether you need a real-time currency rates API free for live trading applications or a historical exchange rates API for in-depth financial analysis, the five APIs listed above offer some of the best solutions in 2025.
For those needing a free FX rate API with a focus on accuracy, CurrencyLayer and Fixer io are strong choices. If historical data is a priority, Open Exchange Rates is ideal, while Exchangeratesapi io is perfect for developers who want an open-source solution. Lastly, for developers who value simplicity, ExchangeRate-API com is a great option. With these options, developers can find a suitable currency data API that fits their specific needs, whether it’s for a small side project or a large-scale commercial application.
