Free APIFinanceNo keyOfficial
Frankfurter (FX Rates)
Open-source, keyless foreign-exchange rates sourced from central banks, with full history
Frankfurter is a free, open-source currency exchange-rate API serving latest and historical reference rates aggregated from central banks including the ECB. It needs no API key and is free for commercial use, with data going back decades. You can also self-host it via Docker.
Free tier
Free, no key, commercial use allowed. No monthly quota.Rate limits
No fixed quota; requests are throttled to prevent abuse. Cache or self-host for high volume.Auth
No keyBase URL
https://api.frankfurter.dev/v1What you'd build with it
- Convert currencies inside an invoicing or pricing automation with no key
- Chart historical FX trends for a finance research skill
- Normalize multi-currency amounts to USD before analysis
- Self-host an internal FX rate service via the published Docker image
Key endpoints
- GET
/latest?base=USD&symbols=EUR,GBPLatest exchange rates for a base currency - GET
/{date}?base=USDHistorical rates for a specific date (YYYY-MM-DD) - GET
/{start}..{end}?base=USD&symbols=EURTime series of rates over a date range - GET
/currenciesList of supported currency codes and names
Members
Members get the runnable recipe
Sign in free to copy the example request, see a sample response, and read the gotchas.
Tags
forexcurrencyopen-sourcekeylessecb