Check out https://golem.network or http://sia.tech You rent out your unused CPU (Golem) or unused disk space (Sia) and get automatically rewarded

Still it's early days, but watch these talks on IPFS[1] and Golem[2] to get a basic idea.

[1] https://www.youtube.com/watch?v=HUVmypx9HGI

[2] https://www.youtube.com/watch?v=DGinj5K3tcI

You can do immediate payment - and with this, hard spending limits.