Now they are strating new invstment plan.
How to invest in coinbase .Its very simple just follow the steps
1 - Log in to your Coinbase account, if you already have funds in your Coinbase wallet, go to step 3.
2 - If your btc balance is empty in Coinbase, add funds to your Coinbase account.
3 - We accept a minimum investment of 0.20 Bitcoin and a maximum of 20.00 Bitcoin per Coinbase account, you can invest any amount between 0.20 to 20.00 Bitcoin.
4 - From your account, send the desired BTC value to invest for the Coinbase bitcoin account
5 - Done! If everything is correct, in 24 hours you will receive payment of the benefit of your investment. The benefit will be paid directly into your Coinbase / Bitcoin account, and you can withdraw your bank or use the bitcoin for any other purpose. The minimum benefit will be 110% and the maximum benefit will be 500%. For example by investing 5.00 bitcoins today (11 July), you will earn after 24 hours from 5.50 to 25.00 bitcoins.
6 - If in 24 hours you do not receive your payment of benefits after sending the bitcoin, you can send a support ticket.
Note::
This offer end on 15 of July, 2017.