There is a wide variety of platform via which you can monetize your blogs. The most known should be Ad Sense but to me it’s kinda complicated to pass through its requirements and then there are many other ad networks like AdCash, Taboola, Mondiad, Adsterra, etc(just google them).
I’m currently monetizing with Mondiad, it’s a really nice platform, easy to use and with fast approvals.
Btw, never heard of Kallisto… I shall check it out too.