Currency Converter APIs
Currency converter APIs pair exchange rates with a conversion endpoint, so you send an amount and get the converted figure back. Fixer, Currencylayer and Exchangeratesapi.io are freemium APILayer services with similar currency coverage, CurrencyFreaks extends conversion to crypto and precious metals, and xChangeApi adds OHLC data with a WebSocket option.
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
CurrencyBeaconReal-time and historical foreign exchange rates plus currency conversion, back to 1996. Finance & Commerce › Currency & Exchange Rates | Freemium | API key | JSON | 100–1k/day | Live |
CurrencyFreaksExchange rates for 166 fiat currencies, 861 cryptocurrencies and precious metals, with conversion and history. Finance & Commerce › Currency & Exchange Rates | Freemium | API key | JSON | <100/day | Live |
CurrencylayerReal-time and historical exchange rates for 174 currencies, with conversion and time-frame data. Finance & Commerce › Currency & Exchange Rates | Freemium | API key | JSON | <100/day | Live |
CurrencyScoopLive and historical foreign-exchange rates with conversion, timeseries and fluctuation endpoints. Finance & Commerce › Currency & Exchange Rates | Freemium | API key | JSON | 100–1k/day | Deprecated |
Exchangeratesapi.ioReal-time and historical exchange rates for 174 currencies, plus conversion and fluctuation data. Finance & Commerce › Currency & Exchange Rates | Freemium | API key | JSON | 100–1k/day | Live |
FixerLive and historical foreign exchange rates for 170 currencies, plus a conversion endpoint. Finance & Commerce › Currency & Exchange Rates | Freemium | API key | JSON | — | Live |
FxFeed.ioLatest, historical and time-series FX rates and conversion for 160+ currencies since 1999. Finance & Commerce › Currency & Exchange Rates | Freemium | API key | JSON | <100/day | Live |
FxRatesAPIReal-time and historical currency exchange rates and conversion, usable without an API key. Finance & Commerce › Currency & Exchange Rates | API key | JSON | — | Live | |
xChangeApiLive and historical foreign exchange rates with OHLC data and currency conversion, via REST and WebSocket. Finance & Commerce › Currency & Exchange Rates | API key | JSON | — | Live |
CurrencyBeaconFreemiumLive
Real-time and historical foreign exchange rates plus currency conversion, back to 1996.
API key · JSON
100–1k/day
no machine-readable spec
CurrencyFreaksFreemiumLive
Exchange rates for 166 fiat currencies, 861 cryptocurrencies and precious metals, with conversion and history.
API key · JSON
<100/day
no machine-readable spec
CurrencylayerFreemiumLive
Real-time and historical exchange rates for 174 currencies, with conversion and time-frame data.
API key · JSON
<100/day
OpenAPI spec
CurrencyScoopFreemiumDeprecated
Live and historical foreign-exchange rates with conversion, timeseries and fluctuation endpoints.
API key · JSON
100–1k/day
no machine-readable spec
Exchangeratesapi.ioFreemiumLive
Real-time and historical exchange rates for 174 currencies, plus conversion and fluctuation data.
API key · JSON
100–1k/day
OpenAPI spec
FixerFreemiumLive
Live and historical foreign exchange rates for 170 currencies, plus a conversion endpoint.
API key · JSON
—
llms.txt
FxFeed.ioFreemiumLive
Latest, historical and time-series FX rates and conversion for 160+ currencies since 1999.
API key · JSON
<100/day
OpenAPI spec · llms.txt
FxRatesAPILive
Real-time and historical currency exchange rates and conversion, usable without an API key.
API key · JSON
—
no machine-readable spec
xChangeApiLive
Live and historical foreign exchange rates with OHLC data and currency conversion, via REST and WebSocket.
API key · JSON
—
no machine-readable spec
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Choosing a Currency Converter API
Is there a free Currency Converter API?
Yes. Fixer, Currencylayer, CurrencyFreaks, CurrencyBeacon, Exchangeratesapi.io and 1 other have a free tier alongside paid plans.
Which Currency Converter APIs work without an API key?
All of them need a key or account. Fixer, Currencylayer, CurrencyFreaks, CurrencyBeacon, Exchangeratesapi.io and 1 other give one out free when you sign up.
Can I use Currency Converter APIs in a commercial project?
CurrencyBeacon and FxFeed.io permit commercial use. Fixer, Currencylayer and Exchangeratesapi.io restrict it, for example to non-commercial or attributed use, so read the terms first.
Which Currency Converter APIs work with AI agents?
Currencylayer, Exchangeratesapi.io and FxFeed.io publish an OpenAPI spec for generating clients and tools.
Broader: Currency & Exchange Rates APIs · Finance & Commerce APIs
More in Currency & Exchange Rates: Forex APIs · Historical Exchange Rates APIs