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.github		.github
bin		bin
config		config
db/migrate		db/migrate
lib		lib
spec		spec
.dockerignore		.dockerignore
.env.example		.env.example
.gitignore		.gitignore
.rubocop.yml		.rubocop.yml
.rubocop_todo.yml		.rubocop_todo.yml
.ruby-version		.ruby-version
CHANGELOG.md		CHANGELOG.md
Dockerfile		Dockerfile
Gemfile		Gemfile
Gemfile.lock		Gemfile.lock
LICENSE		LICENSE
Procfile		Procfile
README.md		README.md
Rakefile		Rakefile
app.json		app.json
config.ru		config.ru
docker-compose.override.yml		docker-compose.override.yml
docker-compose.prod.yml		docker-compose.prod.yml
docker-compose.yml		docker-compose.yml
limit_req.conf		limit_req.conf

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Frankfurter

Frankfurter is a free and open-source currency data API that tracks reference exchange rates published by the European Central Bank.

I host a public instance of the API at api.frankfurter.app.

Get the latest exchange rates.

GET /latest HTTP/1.1

Get rates for a past date.

GET /2000-01-03 HTTP/1.1

Get rates for a period.

GET /2010-01-01..2010-01-31 HTTP/1.1

For more examples, read the docs.

You can self-host Frankfurter with Heroku or Docker.

docker run -d -p 8080:8080 \
  -e "DATABASE_URL=<postgres_url>" \
  --name frankfurter hakanensari/frankfurter

Check out the website for a more detailed walkthrough.

Frankfurter was known as Fixer between 2012 and 2018. After selling the original domain, I relaunched under this name.