Programmatically access currency exchange rates [closed]

Answer 1

I feel compelled to add:

http://www.exchangerate-api.com/

Dead simple to use with a clean RESTful API and signup takes 5 seconds. Includes coding examples for most major languages, most are 2-3 lines long.

Rates are updated hourly, so it's fine for most uses, and you can get 30000 monthly queries for $7 a month. I've never needed more than that, but the rates are very reasonable for higher volumes.