This is a module that allows to update currency rates from addition external sources.

1. Finance Google
2. European Central Bank
3. Fixer

1. Fixer

   [The old, deprecated Fixer API will be discontinued on June 1st, 2018]
   We are happy to announce the complete relaunch of fixer.io into a more 
   stable, more secure, and much more advanced currency & exchange rate 
   conversion API platform. While the core structure of our API remains 
   unchanged, all users of the legacy Fixer API will be required to sign 
   up for a free API access key and perform a few simple changes to their 
   integration. To learn more about the changes that are required.
   

   Be aware that free access to Fixer API has limited functionality.

   You can setup Access Token for Fixer API in your administration panel for Magento.

2. Finance Google

   New changes were introduces by Google and now it's possible only parse HTML to get required information.

   Be aware about that Google may change it HTML structure at any time

3. European Central Bank

   The reference rates are usually updated around 16:00 CET on every working 
   day, except on TARGET closing days. They are based on a regular daily 
   concertation procedure between central banks across Europe, which normally 
   takes place at 14:15 CET.
   

   Be aware about low refresh rate

$ composer require oxcom/magento2-currency-services
$ bin/magento module:enable OxCom_MagentoCurrencyServices
$ bin/magento setup:upgrade
$ bin/magento setup:di:compile

Test will be performed on real sources, so internet connection is required.

$ composer install
$ vendor/bin/phpunit -c Test/phpunit.xml

Some info how to run tests in Travis + Magento Module