Exchangeratesapi.io

Overview

Exchangeratesapi.io offers a specialized REST API designed for developers requiring access to current and historical foreign exchange rate data. The API supports over 170 world currencies, providing data primarily in JSON format. It is structured to serve a range of use cases, from simple currency conversion tools to more complex financial dashboards and e-commerce pricing systems. The service retrieves exchange rate information from various financial data providers, which is then aggregated and made available through a standardized API endpoint.

The API's core functionality includes retrieving the latest exchange rates, accessing historical data for specific dates, performing direct currency conversions, and analyzing time-series and fluctuation data. This allows applications to display up-to-date currency values, calculate past transaction costs, or visualize market trends. For instance, a travel application might use the API to show local currency equivalents for hotel prices, while an e-commerce platform could dynamically adjust product pricing based on the user's geographical location and preferred currency. Developers integrate the API by making HTTP GET requests to specific endpoints, typically requiring an API key for authentication.

Exchangeratesapi.io is best suited for applications that require reliable, programmatic access to currency data without managing diverse financial data feeds directly. Its focus on standardized JSON responses and clear documentation, including cURL examples, aims to facilitate rapid integration. The service provides a free tier for initial development and testing, with paid plans scaling based on request volume and access to advanced features like time-series data. The platform is owned by APILayer, a company that provides various API solutions, and maintains compliance with GDPR standards, addressing data privacy considerations for users within the European Union.

When comparing currency data providers, developers often consider factors such as data source reliability, update frequency, and the breadth of supported currencies. Services like Open Exchange Rates' API documentation highlight similar capabilities, often drawing from institutional sources. Exchangeratesapi.io aims to provide a balance of these factors, ensuring data accuracy through aggregation from multiple sources and offering frequent updates to reflect market changes. The API's design emphasizes ease of use, making it accessible for developers who may not specialize in financial data infrastructure. The historical data endpoints, for example, allow developers to specify any past date to retrieve rates, which is crucial for auditing or reporting purposes in financial applications.

Key features

• Latest Exchange Rates: Provides real-time exchange rates for over 170 world currencies, updated frequently to reflect market changes.
• Historical Exchange Rates: Access exchange rates for any specific past date, useful for historical analysis, auditing, and reporting. Data is available back to January 1, 1999.
• Currency Conversion: Offers direct API endpoints to convert an amount from one currency to another, simplifying calculations within applications.
• Time-Series Data: Retrieve exchange rate data over a specified period, enabling the development of charts and trend analysis tools. This feature supports custom date ranges for detailed historical insights.
• Fluctuations Data: Provides information on currency value changes between two specific dates, indicating percentage and absolute shifts, which is useful for risk analysis or performance monitoring.
• Base Currency Control: Allows users to specify a preferred base currency for all rate requests, defaulting to EUR if not specified. This flexibility supports applications serving different geographical regions.
• JSON Response Format: All API responses are provided in a standardized and easy-to-parse JSON format, compatible with most programming languages and web frameworks.
• API Key Authentication: Secures access to the API using a unique API key, ensuring that only authorized applications can fetch data.

Pricing

Exchangeratesapi.io offers a tiered pricing model, including a free tier for limited usage and several paid plans for increased request volumes and advanced features. All plans include an API key, SSL encryption, and access to historical data. As of May 2026, the pricing structure is as follows:

For detailed and up-to-date pricing information, including annual billing discounts and specific feature breakdowns, consult the Exchangeratesapi.io pricing page.

Common integrations

• E-commerce Platforms: Integrate dynamic currency conversion for international customers displaying product prices in their local currency.
• Financial Dashboards: Display real-time and historical exchange rate charts, portfolio value conversions, and market fluctuation indicators.
• Travel Applications: Show estimated costs in local currencies for flights, hotels, and activities, or provide currency conversion tools for travelers.
• Accounting and ERP Systems: Automate multi-currency transaction processing, reconcile foreign currency accounts, and generate financial reports with accurate historical rates.
• Investment and Trading Tools: Provide data for analyzing currency pair movements, backtesting trading strategies, and monitoring global market trends.

Alternatives

• Open Exchange Rates: Offers a similar JSON API for currency exchange rates, with a focus on enterprise-grade data.
• fixer.io: Another popular API for real-time and historical foreign exchange rates, known for its simple REST interface.
• Currencyapi.com: Provides current and historical currency exchange rates with a focus on ease of integration and high availability.

Getting started

To begin using Exchangeratesapi.io, obtain an API key from their website. Once you have your key, you can make HTTP GET requests to the API endpoints. The primary language for examples is cURL, demonstrating how to retrieve the latest exchange rates:

curl -X GET "https://api.exchangeratesapi.io/v1/latest?access_key=YOUR_API_KEY"

Replace YOUR_API_KEY with your actual API key. This request will return the latest exchange rates against the default base currency (EUR) in JSON format. To specify a different base currency, such as USD, append the base parameter:

curl -X GET "https://api.exchangeratesapi.io/v1/latest?access_key=YOUR_API_KEY&base=USD"

To retrieve historical rates for a specific date, for example, January 1, 2020, modify the endpoint to include the date:

curl -X GET "https://api.exchangeratesapi.io/v1/2020-01-01?access_key=YOUR_API_KEY"

For more advanced features like currency conversion, time-series data, or fluctuation data, refer to the Exchangeratesapi.io documentation. The documentation provides detailed explanations of all available endpoints, parameters, and response structures, along with additional code examples for various programming languages.