Free APIs
Free Currency exchange APIs
| API | Free tier | Auth | Docs |
|---|---|---|---|
| Frankfurter Exchange rates published by the European Central Bank Catch: ECB reference rates only, published on working days | Free, no key | No key | docs |
| ExchangeRate-API Currency conversion rates for 160+ currencies Catch: Daily updates on free plan; paid plans update hourly | Free plan; rates update once every 24 hours | API key | docs |
| Open Exchange Rates Hourly forex rates, historical and conversion Catch: Free plan: USD base only, hourly updates | Free plan: 1,000 requests/month | API key | docs |
| Fixer Foreign exchange rates and currency conversion Catch: Non-commercial use | Free plan: 100 API calls/month, hourly updates | API key | docs |
| CurrencyAPI Live and historical currency exchange rates Catch: Free plan: 10 requests/minute | Free plan: 300 requests/month | API key | docs |
| Currency API (fawazahmed0) Static JSON exchange rates for 200+ currencies and crypto Catch: Community project served via CDN; no SLA | Free, no key, no rate limits | No key | docs |
FAQ
What is the best free currency exchange API?+
Frankfurter, ExchangeRate-API, Open Exchange Rates are good places to start. Compare the free tiers and catches in the table; they differ mostly in limits and whether commercial use is allowed.
Is there a currency exchange API without an API key?+
Yes: Frankfurter, Currency API (fawazahmed0) work without a key.
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