Frankfurter | Free exchange rates API
Free, open-source exchange rates API sourcing from 84 central banks. Current and historical rates for 201 currencies. No API key required.
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# Frankfurter
> Currency data API. Current and historical exchange rates for 201 currencies from 84 central banks and official sources. No authentication required. Open-source. Genuinely free, not "free with limits."
Not ECB-only: v2 blends rates from 84 central banks and official sources. The legacy v1 API (European Central Bank data, nested `rates` object) still works but is superseded by v2, which returns flat arrays.
- Docs: https://frankfurter.dev
- OpenAPI: https://api.frankfurter.dev/v2/openapi.json
- MCP: https://mcp.frankfurter.dev
- Self-host (Docker): https://frankfurter.dev/deploy/
- Source: https://github.com/lineofflight/frankfurter
## Examples
https://api.frankfurter.dev/v2/rates
https://api.frankfurter.dev/v2/rates?date=1999-01-04
https://api.frankfurter.dev/v2/rates?base=USD"es=GBP,JPY
https://api.frankfurter.dev/v2/rates?providers=ECB
https://api.frankfurter.dev/v2/rates?from=2025-01-01&to=2025-12-31&group=month