In 2025, developers are increasingly looking for ways to streamline currency conversion processes, especially as global commerce continues to expand across digital platforms. Having a reliable Free API Currency Converter integrated into applications can simplify cross-border transactions and provide real-time currency conversion for users. In this blog, we’ll explore the top 5 free currency converter APIs, focusing on their key features, ease of use, and why they stand out for developers.
1. Fixer.io
Fixer is one of the most popular free API currency converters available in the market, particularly known for its simplicity and reliability. It offers real-time currency conversion data from more than 170 currencies worldwide. For developers, integrating Fixer is straightforward, with well-documented API endpoints that return data in JSON format, making it easily adaptable to various programming environments.
Key Features:
Supports over 170 currencies.
Real-time and historical exchange rate data.
Free tier includes access to basic currency conversion features.
Excellent documentation with example code for quick integration.
Fixer is perfect for small businesses and startups that need a reliable solution for currency conversion without having to break the bank. Its free plan offers up to 1,000 API requests per month, making it an ideal choice for lightweight applications.
2. ExchangeRatesAPI.io
ExchangeRatesAPI is another free tool that offers accurate currency conversion data. This API is highly appreciated for its ease of use and speed, which makes it a go-to for developers who need to integrate currency exchange functionalities quickly. With a minimal setup, this free API currency converter allows access to both live and historical data.
Key Features:
Coverage of over 160 currencies.
Simple and fast JSON-based API responses.
Free tier includes 250 API requests per month.
Provides daily updates for exchange rates.
For developers working on financial or e-commerce platforms, ExchangeRatesAPI is a great choice. Its basic plan supports moderate usage, allowing startups to efficiently manage conversions for multiple currencies without additional costs.
3. Open Exchange Rates
Open Exchange Rates provides access to reliable currency conversion data through a free API currency converter that serves over 200 currencies. Known for its accuracy, this API is widely used in financial applications that require precise conversion rates. The free tier offers basic access to live exchange rates, making it perfect for smaller applications.
Key Features:
Supports over 200 currencies.
High-quality real-time currency conversion rates.
Free plan includes 1,000 API requests per month.
Developer-friendly documentation and code samples.
This API is ideal for developers who are building international applications or services that require global transactions. The flexibility offered by Open Exchange Rates ensures that developers can integrate it into their applications with ease, allowing them to focus on building their core features.
4. CurrencyLayer
CurrencyLayer offers real-time exchange rates and currency conversion for over 168 currencies worldwide. This free API currency converter is designed with developers in mind, offering easy-to-understand API documentation and quick response times. It’s a robust solution for businesses that need precise exchange rate data at no cost.
Key Features:
Real-time exchange rates for 168 currencies.
JSON data format for smooth integration.
Free plan includes 250 API requests per month.
Lightweight and fast API responses.
The free tier of CurrencyLayer offers all the essential features needed for currency conversion, making it suitable for small projects and applications. Its reliability and speed make it a great option for developers who need to quickly integrate a solution without worrying about high costs.
5. XE Currency Data API
XE Currency Data API is a widely trusted name when it comes to currency exchange. Offering free access to real-time exchange rates, XE Currency Data API is perfect for developers looking for an efficient currency conversion solution. With global recognition and a solid reputation, XE provides developers with accurate and timely conversion data.
Key Features:
Access to more than 150 currencies.
Accurate and reliable real-time currency conversion.
Free tier includes 100 API requests per month.
Simple and user-friendly API documentation.
For developers working on smaller applications or experimenting with currency conversion tools, XE Currency Data API provides an excellent option with its trusted name and accessible free tier. The API’s straightforward integration process makes it a popular choice for new developers and experienced professionals alike.
Conclusion
Integrating a free API currency converter into your application is a must for businesses and developers working on global platforms. Whether you're looking for real-time conversion rates or historical exchange data, these top 5 free APIs provide a reliable solution with varying levels of usage based on your needs. Each API on this list stands out for its features, ease of integration, and ability to deliver accurate and timely currency conversion data.
Choosing the right currency conversion API depends on your specific requirements, such as the number of currencies you need, the frequency of updates, and the monthly API request limit. By incorporating one of these APIs, developers can simplify their projects and ensure that their applications provide seamless and reliable currency conversion functionalities.
