ExchangeRate-API
Free currency conversion via API key over HTTPS.
Read docs Updated 2026-06-16
What is ExchangeRate-API?
ExchangeRate-API is a finance service that supplies free currency conversion.
It supports integration by applications and services needing exchange rate data.
What you can build with ExchangeRate-API
Build a real-time currency converter widget
Embed live exchange rates into websites or mobile apps so users can instantly convert between currencies during checkout or travel planning.
Automate international invoice calculations
Pull current rates into accounting software or scripts to convert and display invoice totals in a client's local currency.
Power financial dashboards and alerts
Feed exchange data into internal tools that monitor rate fluctuations and trigger notifications for traders or finance teams.
Get started with ExchangeRate-API
- 1Sign up on the ExchangeRate-API site and obtain your free API key
- 2Read the documentation to find the latest rates endpoint and supported currencies
- 3Make an HTTPS GET request including your API key as a query parameter
- 4Parse the JSON response to extract conversion rates for your target currencies
- 5Implement basic error handling for invalid keys or network issues
ExchangeRate-API: pros & cons
Pros
- +Free tier available with no upfront cost
- +HTTPS encryption for all requests
- +Simple API key authentication
- +Straightforward JSON responses
Cons
- –Free plan likely includes rate limits
- –Requires API key for every call
- –No offline or bulk historical data mentioned
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A free service that provides currency conversion rates via a simple API.
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