"Bamboo is a microinvestments platform that allows anyone to seamlessly purchase digital assets, like Gold and Bitcoin. It's an easy, secure, and effective way to participate in this growing asset class. All you need is a mobile phone and a bank account to get started.
Bamboo sync's your selected bank accounts for transactions. We then round to the nearest full value and easily invest the spare change from your daily expenses into a diverse portfolio of assets.
from their email:
We are Bamboo! The easiest way to invest into your favourite digital currencies. For a limited time: You can get $20 in BTC when you onboard onto the Bamboo app for the month of June. Use code: "BAMBOO20"
After signing up, go to 'setting' > enter BAMBOO20 in the 'promo' section