https://qz.com/1095292/dust-lets-you-buy-bitcoin-with-spare-change-with-monzo/

Buying bitcoin is still a cumbersome process, as Quartz’s guide to investing in cryptocurrencies will attest. A new app called Dust aims to change that by automatically investing your spare change in bitcoin, litecoin, or ethereum.

Here’s how Dust works: It connects to your bank account to see your transactions. Then it rounds up each transaction to the nearest dollar—basically, collecting spare change. Once about $10 of change has been accumulated, the amount is used to buy bitcoin, litecoin, or ethereum, in proportions set by the user. The app only reads your bank’s transaction data; it doesn’t have access to the fiat or crypto funds. The cryptocurrencies are acquired through Coinbase, one of the biggest firms in the business.