Frankfurter

API

Free, open-source exchange rate API with no key and no quotas

Price: Free, open source
Access: None

Docs
Repo
OpenAPI
llms.txt

About

Open-source currency API with daily and historical exchange rates for 206 currencies from 98 central banks and official sources. No key and no monthly caps, only abuse rate limits; you convert amounts yourself. MIT licensed and self-hostable with Docker.

What you can do with it

Get today's exchange rate between two currencies
Look up historical rates for a date or a date range
Convert prices in your app into a user's local currency

Get started

Call the v2 endpoints; no key or sign-up is needed
Multiply amounts by the returned rate to convert

Example

curl "https://api.frankfurter.dev/v2/rate/eur/usd"
curl "https://api.frankfurter.dev/v2/rates?base=usd&quotes=eur,gbp,jpy"

Details

Hosting: Hosted service, Self-hosted
Available in: Worldwide
MCP server: Remote