[solaris_7]

There are already a number of existing alternatives:

http://fixer.io

https://openexchangerates.org

https://www.exchangerate-api.com

http://www.xe.com/xecurrencydata

[dx034]

You find FX data everywhere because it's public. But Yahoo also had stock data. And that is hard to find for free online. I guess Yahoo had to shut it down because exchanges didn't like them giving data away for free via API.