RCB stands for referral commission back. If you sign up as a referral of a monitor the monitor will give a percentage of your deposit back to you.
Monitors offer RCBs as a form of marketing to gain more users. Sometimes monitors give more to the user than they actually receive from the HYIP. They probably do this to attract more users even if this means that they lose some money with the RCB offer.
We compare the RCB rates of different monitors and allow you to search for the best rcb offer.
Before becoming a referral of a monitor read their RCB rules and make sure that you follow them precisely.