Managing currency exchange rates and conversions is crucial for developers working on international e-commerce platforms, travel services, fintech applications, or any service involving transactions across borders. With the evolution of APIs, the process of integrating currency conversion functionalities into apps and websites has become easier, more efficient, and often free. In this blog, we'll explore the Top 10 Free Currency Converter APIs you can use in 2025 for seamless integration, ensuring real-time, accurate exchange rate data for your projects.

1. Fixer

When it comes to a reliable free currency converter API, Fixer is a popular choice among developers. It provides real-time forex data and covers over 170 currencies globally. The API is known for its simplicity and speed, offering up-to-date foreign exchange rates API data from banks and financial institutions. Its free tier allows up to 1,000 API calls per month, making it a great starting point for small-scale projects. Additionally, Fixer is easy to integrate with various programming languages, making it a go-to currency exchange API.

2. Open Exchange Rates API

For those looking for a free forex API with accurate foreign exchange rates, Open Exchange Rates is another excellent option. It offers a straightforward, developer-friendly API that supports over 200 currencies. With features like historical data and time series, developers can also integrate data analytics or build customized applications. The free plan includes 1,000 requests per month, making it a popular choice for startups and small applications requiring a currency rate API.

3. CurrencyLayer

CurrencyLayer is a widely used exchange rate API-free option for developers needing a fast and reliable service. It provides access to live and historical forex rates API data for over 160 currencies. What makes it standout is its enterprise-grade security and SSL encryption, ensuring data privacy. The free version of the currency exchange API offers access to basic currency conversions with a limit of 1,000 requests per month, which is sufficient for small applications and testing purposes.

4. Exchangerate-API

As a trusted provider of exchange rate data, Exchangerate-API offers developers a simple, no-nonsense solution for integrating free fx rates API into their applications. Supporting over 150 currencies, it provides accurate and real-time data sourced from credible financial markets. One of its strongest selling points is the ease of integration — developers can quickly implement the currency converter API into their apps or websites without a complex setup. The free currency exchange rate API allows 1,500 requests per month, which makes it perfect for small businesses and developers who need a currency exchange free API solution.

5. ExchangeRateHost API

Looking for a currency conversion API with a robust free plan? The ExchangeRateHost API delivers live and historical exchange rates API for 150+ currencies. It’s known for its comprehensive, well-documented API that’s easy to integrate with a variety of systems. The free exchange rate API plan offers up to 10,000 requests per month, which makes it ideal for mid-sized applications that require a large volume of currency conversions. Its flexible format allows developers to handle data in JSON or XML formats, adding more versatility.

6. XE Currency Data API

A well-established name in the world of currency conversion, XE offers a powerful free currency conversion API for developers. It covers all major global currencies with real-time data updated every minute. The free Forex API offers up to 100 requests per month, which is great for basic applications. XE’s strong reputation and highly accurate data make it an ideal choice for developers looking to integrate reliable Forex data API into their software solutions.

7. Alpha Vantage

Although best known for its stock market data, Alpha Vantage also provides an excellent currency trading API for accessing real-time and historical foreign exchange rates. The currency rates API free tier allows developers to access up to 500 API calls per day. It supports popular currency pairs and offers both intraday and historical time series data, making it ideal for fintech applications, trading platforms, and other financial services needing a free currency converter API.

8. Coinlayer API

If your project involves cryptocurrencies alongside fiat currencies, Coinlayer API is an excellent choice. This free currency API supports over 385 crypto and fiat currencies, making it a powerful tool for developers working in the fintech or cryptocurrency space. The free fx rate API plan allows 100 requests per month, which might suit small projects or testing environments. The Forex rates API can be integrated easily into applications that require both traditional and crypto conversions.

9. Currencystack API

Currencystack API offers both real-time and historical forex API data, supporting over 160 currencies worldwide. It is widely appreciated for its high precision and comprehensive API documentation. The currency exchange rate API also comes with a free plan allowing 500 requests per month, making it a good fit for developers working on smaller apps or projects that don’t require intensive currency conversion operations.

10. OANDA Exchange Rates API

Known for its accuracy and reliability, OANDA offers a robust foreign exchange API trusted by developers and financial institutions alike. The fx rate API covers a wide range of currency pairs and offers historical data dating back several years. While its free plan is more limited than others (with only 100 requests per day), its high level of accuracy and the company’s established reputation make OANDA a strong contender in the realm of free currency exchange rate API solutions.

Conclusion

In 2025, integrating currency conversion functionality into your application is easier than ever with these powerful and reliable APIs. Whether you’re a developer building a small-scale project or an enterprise-level application, these top 10 free currency converter APIs provide a diverse range of features that cater to different needs. From real-time data to historical analysis, these APIs are designed to make your development process more efficient. Choosing the right currency exchange free API for your project depends on your specific needs, such as the volume of requests or the need for advanced features like historical data. The key is to ensure seamless integration to enhance the user experience of your platform.