10 Best Currency Exchange API Options for Developers

Introduction

For financial or e-commerce applications, developers often need real-time, accurate exchange rate information. The issue is this: you must show the correct prices to international customers if you have built a global site. Tracking exchange rates manually is slow, error-prone, and unsuitable for modern applications.

A Currency Conversion API is the simple solution. First, we will explore what exactly these APIs are and why your applications need them. After that, we look at the important features that make an API truly valuable. Finally, you will get a review of 10 free Currency Conversion APIs for developers. This post helps you understand and set up this important feature easily.

What Is A Currency Conversion API?

A Currency Conversion API is a tool that returns the current or historical currency rate data via a program. Think of it like a digital librarian who only handles exchange rates. You ask the API for a rate. The service then returns the required currency rate in a standard format, such as a portable JSON format for easy integration or XML.

Why We Need Currency Conversion APIs

These APIs are necessary because they enable local pricing. They instantly change the price from your main currency to a user's local currency, making it easy to convert one currency to another for localized pricing. This clear change greatly improves the user experience and reduces shopping cart abandonment.

How A Currency API Works

The process is easy. Your app initiates an HTTP request to a specific API endpoint. This request must include a special API key to verify your authorization to use it. You also specify the source currency for accurate conversions, list the target currency (e.g., USD), and the currencies you want to convert to (e.g., EUR, GBP) in the request.

Your request goes to the API server. The server checks its huge database. This database is continually updated from many trusted sources, including national banks. The server then converts the requested rate data into a JSON or XML response. It sends this data back to your app. Your app quickly processes this data and applies the correct rates to your software.

Types Of Currency Conversion API Endpoints

A strong currency API provides several endpoints for specific use cases.

• The Latest Rates endpoint is the most used; it provides the most current exchange rates in real time.

• To make charts or do accounting, you use the Historical Rates location. This gives you rates for any past date you provide.

• Developers use the Time Series endpoints to study trends. It provides time series data, offering a series of daily rates between two dates for analyzing historical exchange rate trends.

• Finally, the Conversion endpoint makes things easier by doing the math. You can use it to convert currencies programmatically: enter the starting currency, the ending currency, and the amount, and it gives you the converted amount.

What Are The Features Of The Best Free Currency Conversion APIs?

You should look at the technical details of the free API plan when comparing them. These details show how useful and reliable a service is for professional work. The best APIs offer guaranteed availability and support scalable volumes for growing applications. A free service with no hidden fees is especially attractive, while premium features may be available at higher tiers.

Reliability And Data Quality

The exchange rates you receive must be accurate. Because of this, you should always choose APIs that get their data from official, trusted foreign exchange markets (forex) and national banks. The best APIs aggregate data from multiple central banks for enhanced accuracy. A high-quality API ensures that data remains safe as it moves by using SSL encryption, such as bank-grade 256-bit SSL encryption, to protect all data transfers from intrusions and hacking attempts. This is a very important feature of free services.

Coverage And Update Frequency

The best services include real-time data for hundreds of worldwide currencies. This covers standard cash currencies (fiat), precious metals, and, increasingly, many cryptocurrencies. Another key difference is how often the data updates. Free plans usually update daily.

Documentation And Ease Of Use

Clear, good documentation is a must for quick setup. Look for APIs that provide a straightforward API structure and full details on endpoints, along with clear and detailed code examples in multiple languages (e.g., Python, JavaScript, and PHP). This greatly reduces your development time and makes integration easier for developers at all experience levels. Also, an API that gives information in a simple, clean structure will always be the easiest for your apps to use.

JSON Response and Data Parsing

One of the standout features of the Exchange Rates API is its reliable JSON response, designed for effortless integration into a wide range of applications. Whether you're building a currency converter for an e-commerce store, a financial dashboard, or a mobile app, the API's straightforward structure ensures you can access and utilize up-to-date exchange rate data with minimal effort.

10 Best Free Currency Conversion APIs For Developers

It is important to pick the right tool. The list below shows 10 high-quality free currency APIs that will meet the needs of modern developers.

CurrencyFreaks -- The Best Currency Exchange API

CurrencyFreaks is a website that offers live and historical exchange rate information. It covers currencies. This includes cash currencies (fiats), metals, and cryptocurrencies. You get correct, fast, and trusted information on reliable financial products with instant access to exchange rate data.

In the pricing section, the Starter plan is transparent with no hidden fees, ensuring you know exactly what you are paying for.

Features

• Huge currency coverage: Get currencies updated every minute.

• Accurate information: Obtained through certified financial institutions to get reliable data.

• High security: All requests use HTTPS.

• High speed: Geo-based routing keeps latency at 20-40 ms worldwide.

• Proper documentation: Step-by-step instructions for easy setup.

• Priority support: Paying customers receive fast email response.

Pricing

Free with the option of upgrading. Get a discount with yearly billing.

• Developer (Free): 1,000 requests/month, 24-hour updates, USD base, included with the possibility of the use of SSL.

• Starter ($9.99/month): 15,000 requests per month, hourly pricing, live and historical rates, and all base currencies.

• Growth ($49.99/month): 150,000 requests/month, 10-minute updates, IP-to-currency, premium support.

• Professional (99.99/month): 550,000 requests/month, 60-second updates, time series and fluctuation, premium support.

• Enterprise (Custom): The solution is used by many people; it is a custom solution with 60-second updates and can access all locations (endpoints).

Suitable For

CurrencyFreaks is for developers of trading, fintech, eCommerce, or crypto apps. This API is a good choice if you need accurate, fast, and secure foreign exchange information.

Fixer -- Another Free Currency Exchange Rate Data API

Fixer offers both live and historical foreign exchange rates via a simple and reliable JSON API. It handles 170 international currencies and updates every 60 seconds. The information comes from trusted financial sources, for example, the European Central Bank. You can set it up in a few minutes and start getting reliable currency data right away.

In the pricing section, it's important to note that the Professional plan has no hidden fees at the professional level, ensuring transparent and upfront pricing.

Features

• Live data of 170 global currencies.

• The data that is available historically since January 1999, January 1.

• Live conversion, time series, and fluctuation endpoint.

• Bank level 256-bit secure linkage through the use of SSL.

• Detailed documentation and a clean code sample.

• Quick reaction time and performance up-scalability.

Pricing

• Free: 100 API calls, hourly update, and includes the use of the historical data (base currency EUR).

• Basic Plan ($13.99/month): 10,000 calls, all base currencies, regular support.

• Professional Plan ($52.99/month): 100,000 calls, 10-minute updates, time series information.

• Professional Plus ($84.99/month): 500,000 calls, 60-second updates, full feature access.

• Custom Plans: Higher volumes or special needs are available.

Suitable For

• Application developers

• Mobile apps that require real-time currency data integration.

• New businesses and companies that handle international transactions.

• E-commerce and financial dashboards.

ExchangeRate API -- A Top-Notch Free Currency Converter API

This API provides live, accurate currency exchange information and offers a reliable free service for developers. It is quick, direct, and easy to use. It can be set up in a few minutes using a few lines of code. It does not matter whether you create a dashboard, an application, or a shop. With this API, your data is always up to date and accurate.

Features

• Get exchange rates in 161 currencies in over 200 countries.

• Get clean and easy-to-read JSON responses.

• Get an hourly update on the paid and a daily update on the free tier.

• Use more than one data confirmed source.

• Be always online with AWS-guaranteed performance and uptime.

• Get any needed documentation and support on demand.

Pricing

• Free Plan ($0 per month): Get 1,500 requests. Data updates once a day. Good for learning and little tests.

• Pro Plan ($10 per month): Get 30,000 requests. Data updates every hour. Includes historical data and email support.

• Business Plan ($30 per month): Get 125,000 requests per month. Data updates every 5 minutes. High availability and priority support are included.

Select a plan that is right for you. You can upgrade anytime.

Suitable For

It is an API that anyone can use for fast, accurate currency information.

• SaaS architecture with dynamic rates of exchange.

• Powering local pricing of e-commerce stores.

• Develop dashboards to monitor transactions worldwide.

• FX data will be reliable to automate spreadsheets or research projects.

Open Exchange Rates -- Simple And Free Currency Converter API

The OER provides high-quality, up-to-date currency data. It has over 100,000 users and businesses. Live exchange rate and conversion information are provided in seconds. The API is made to be developer-friendly. Because of this, it is simple and clean with easy scalability to your app, and supports scalable volumes for growing applications.

Features

• Live and historical rates for 200+ currencies.

• Get information in simple, easy-to-read JSON form.

• Combine with 200+ Open-source packages and libraries.

• Get insights with time-series and conversion APIs.

• Grow big projects into high-traffic apps.

• Have good record-keeping and customer-related care.

Pricing

• Developer Plan ($12/month): You receive updates every hour, 10,000 API requests a month, and all base currencies are available to you. Perfect use of new companies and small projects.

• Enterprise Plan ($47/month): This includes 30-minute updates, 100,000 API requests per month, and time-series. Perfect for small or medium teams.

• Unlimited Plan ($97/month): You receive 5-minute updates, unlimited API calls, and full currency conversion. Best suited to high-demand companies.

Suitable For

It works best with developers, startups, and business projects that rely on accurate, scaled currency information.

CurrencyLayer -- A Strong, Free Currency Converter API

CurrencyLayer provides instant, competitive exchange rates by aggregating data from multiple commercial sources, including banks and financial institutions. It deals with 168 global currencies and precious metals. It is compatible with any application or program language within minutes. It has over 250,000 companies that rely on it for accurate data. This API is suitable if you need quick, reliable foreign exchange rates.

For enterprise users, the Platinum Support Click feature offers dedicated, priority support and quick issue access, ensuring fast and reliable resolution of any problems.

Features

• Correct Data: Receive live updates at least 60 minutes, 10 minutes, or even 60 seconds.

• Wide Coverage: Access rates for 168 currencies and metals at all times.

• Historical Data: CEO and rate history up to 19 years.

• Simple JSON endpoints: Simple to integrate with simple JSON endpoints.

• Conversion Tools: Change base sources and currencies, and watch rate changes in real time.

• Safe Web: Enjoy HTTPS with 256-bit encryption for secure data access.

• Usage Insights: Visually monitor your API usage and receive notifications when you hit limits.

• Developer Support: An interactive documentation and quick-to-respond technical support.

Pricing

• Free Plan ($0/month): 100 API calls, daily updates, HTTPS, and historical rates.

• Starter Plan ($8.99/month): Includes 2,500 requests, hourly updates, source switching, and basic support.

• Basic plan ($13.99/month): 10,000 requests/hour, updates every hour, commercial usage, and basic support.

• Enterprise Plan ($52.99/month): 100,000 requests, updates in 10 minutes, time-frame queries, and other advanced tools.

• Enterprise + Plan ($84.99/month): 500,000 requests, 60-second updates, full access, and platinum support.

Need more? Ask for a personal enterprise plan that lets you make unlimited calls and receive very special treatment.

Suitable For

CurrencyLayer is great for companies, small teams, and developers. Use it on currency converters, finance apps, or dashboards.

XE -- A Trusted Authority In Currency APIs

Meet the XE Currency Data API. It offers live, accurate exchange rates for over 220 currencies worldwide. With more than 30 years of foreign exchange experience, XE gets information directly from leading financial data providers, financial institutions, and central banks. It is dependable and of professional quality.

Features

• Live updated rates on a 60-second basis.

• 100+ trusted sources worldwide for access.

• Look into historical rates, monthly means, and volatility trends.

• Trade in more than 170 currencies, metals, and some cryptocurrencies.

• Easy setups with SDKs of Java, NodeJS, PHP, and Python.

• Quickly set it up with SAP, Oracle, or Microsoft Dynamics.

• Below are user examples and documentation that are easy to follow.

Pricing

• Lite: 10,000 requests per month (daily rates) 799/year.

• Intermediate: 1799/year, 50,000 requests/month (hourly and daily).

• Prime: 4499/year, 150,000 requests/month (15-min, hourly, and daily).

• Enterprise: Individual pricing and full access to live rates and limits.

• An add-on to live rates/source alternatives.

• Try it first with a free trial.

Suitable For

• Companies that need live FX information.

• Managers creating applications or ERP systems.

• Fintechs and financial institutions need accurate rates.

• IT and software vendors are developing data-driven products.

• Any person wanting fast, scalable, and reliable data on currency.

Currency API -- A Great Option For Fiat And Crypto

Currencyapi provides current and past exchange rates of more than 170 currencies and cryptocurrencies. It is an automatic update. This means that the information will never be old. The API is quick, safe, and easy to set up. For business users, Currencyapi offers transparent pricing plans with no hidden fees business, ensuring affordability and clarity for all subscription levels.

Features

• More than 170 world currencies/cryptocurrencies.

• Live and historical rates.

• REST API with JSON output.

• Sandbox testing and HTTPS encryption.

• SDKs and Postman collection.

• 60-second updates and good uptimes.

• Multi-language support.

Pricing

• Free ($0/month): 300 requests, 1 key, personal use, updated on a daily basis.

• Small ($9.99/month): 15,000 requests, 1 key, commercial use, hourly updates.

• Medium ($39.99/month): 600,000 requests, 2 keys, sandbox access, 60 sec updates.

• Large ($79.99/month): 1.7M requests, 5 keys, access to sandbox, updates in 30 seconds.

• Custom: Custom keys, flexible requests, as well as full commercial usage.

Suitable For

Great for developers, projects, and companies that need trustworthy foreign exchange or crypto data. Best in e-commerce, analytics, and finance dashboards.

IBAN: Forex Reference Suite -- Combining Rates With Validation

The IBAN Suite API provides a live currency exchange rate API and a basic forex API. It is great for projects that involve both IBAN checks and currency conversion data, ensuring reliable, correct information.

Features

• IBAN Check: Check IBAN validity.

• Currency Exchange Rates: Live 154 currency exchange rates with 10 minutes of updates.

• Currency Conversion: Convert currency amounts using the most recent rates.

• International currency code standards: ISO 4217 Compliant.

• Security: HTTPS connections are secure.

• Simple Integration: Easy REST API and JSON and XML responses.

Pricing

• Professional: EUR530/year, 2,000 lookups.

• Business: EUR1,450/year, 20,000 lookups.

• Corporate: EUR2,350/year, 50,000 lookups.

• Business: EUR4,150/year, unlimited searches.

Suitable For

Businesses and developers need a live currency exchange and IBAN validation. Perfect for finance services, foreign transfers, and multi-currencies.

Alpha Vantage -- Reliable Market Data For Traders

Alpha Vantage is a robust, easy-to-use API that provides live and historical market data to its users, along with advanced features for financial analysis. It covers a variety of asset classes, including stocks, forex, cryptocurrencies, ETFs, and commodities. You receive enterprise-level financial data that is easy for traders, developers, and analysts.

Features

• Live access to stock, forex, crypto, and commodity data.

• Get more than 60 technical and economic indicators.

• Built-in AI agent and spreadsheets support.

• The financial news and market sentiment analysis in a single place.

• Easily set up with Google Sheets, Excel, and cloud applications.

Pricing

Alpha Vantage offers a free API key that has high usage limits for developers. Paid plans also allow increased request rates, quality endpoints, and priority services. It is very clear and openly priced for individual and enterprise users.

Suitable For

Best suited to developers, quant researchers, fintech startups, and traders who need to be able to rely on market data. It can also be helpful to students and teachers who study finance, AI, or data science.

ExchangeRate Host -- Fast And Generous Free Tier

ExchangeRate Host offers both historical and current forex and crypto data. It is quick, easy to get around, and useful. With more than 160 supported currencies and metals, you can use an easy JSON interface. ExchangeRate Host provides a free plan with no hidden fees, ensuring transparent pricing and no surprise charges. This can be set up with your application in no time.

Features

• Live rate and past historical data.

• 19 years of records.

• 168+ currencies and metals.

• Endpoints Conversion and time series Endpoints.

• 99.99% uptime.

• Trusted source of financial information.

• Easy JSON integration.

• Developer support and useful documentation.

Pricing

• Free: $0. No hidden costs.

• Starter: $86.99/year or $7.99/month. For small projects.

• Basic: $161.99/year or $14.99/month. Increased limits and features.

• Professional Plus: 629.99/year or 59.99/month. Up to 100,000 monthly requests.

• Business: $1,019.99/year or $99.99/month. Up to 500,000 monthly requests.

• Optional Platinum Support for faster help.

Suitable For

Best when developers, startups, and businesses need correct and fast rate data. Perfect with financial dashboards, analytics applications, and currency-related apps.

Conclusion

You have explored the technical world of Currency Conversion APIs. Services such as Currency Freaks present a great mix of safety, currency coverage, and a very generous free starting point.

Competitors such as Fixer and OANDA provide industry accuracy. You can make certain choices and add live currency conversion to your next application.

FAQs

How Do I Get Started With Free Currency Conversion APIs?

The first step is to register for the provider's free plan. In this step, you are guaranteed your own API key. Then carefully review the provider's documentation. At this point, you can use a basic HTTP client or cURL in your language of choice to send your first request to the Latest Rates endpoint.

What Programming Languages Can I Use With A Currency API?

Almost any programming language can be used. They are REST APIs. This means all you need to do is make an HTTP request and handle the JSON data you receive. Examples include Python (requiring requests), JavaScript (requiring fetch), PHP, Java, and Ruby.

Can I Get Both Real-Time And Historical Exchange Rates Using These APIs?

Yes, the premium APIs provide special endpoints for both needs. The most recent rates endpoint gives the most current data. The historical rates endpoint returns historical rates by accepting a required date parameter, usually in the format YYYY-MM-DD.

Do Free Currency APIs Also Support Cryptocurrency Exchange Rates?

Cryptocurrency support is based solely on the provider's information sources. The best APIs, such as CurrencyFreaks, also support a wide range of cryptocurrencies and metals, even at the free level. The list of supported symbols is always available in the API documentation.

What Is The Average Update Frequency Of Currency APIs?

The update rate varies widely depending on the level of service. Free versions will typically refresh every 24 hours or every hour. Paid subscriptions have a much faster frequency. Many are updated every minute or stream live in real time on extremely busy financial applications.

Register now with CurrencyFreaks, receive your free API key, and start creating truly global software. Get your 1000 free monthly API calls!