https://keepingstock.net/automatically-invest-spare-change-into-crypto-currency-d94ef6ec9ad5
Dustapp.io allows you to invest your spare change into a cryptocurrency of your choice. I used acorns for a while, it allowed you to round up purchases and invest the change in the stock market. This is the same concept but your change is invested in cryptocurrency. You can decide on a portfolio consisting of BTC, ETH and LTC. You can choose just one currency or choose your own split.
They are currently collecting emails for the alpha release of their app.