YahooFx

Yahoo makes currency rates publicly available. This Elixir library provides a Float with the current exchange rate when you provide the currency pair.

How to use in an app

1) Add YahooFx and hackney as dependencies in mix.exs

defp deps do
  [
    {:yahoo_fx, "~> 0.2.0"},
    {:hackney, "~> 1.4"},
  ]
end

Run mix deps.get to install the dependencies.

2) Add httpoison to applications in mix.exs

def application do
  [applications: [httpoison]]
end

3) Start using YahooFx to get rates

You can now make calls like this in your app:

YahooFx.rate(:eur, :usd)

Examples:

Get the current exchange rate between Euro and US Dollar

iex> YahooFx.rate("EUR","USD")
%{datetime: {{2014, 8, 1}, {17, 33, 0}}, rate: 1.3429, text: "EUR to USD"}

iex> YahooFx.rate(:usd, :dkk)[:rate]
5.5526

Date/time issue

It has been observed that Yahoo provides a time and date combination that seems to be incorrect at times. A suspicion is that the time zone for the date is UTC and New York for the time. So for instance at 20:00 during summer in New York the date will change to the next day because at UTC the date has changed, while the time provided will change from 7pm to 8pm.