A recruiter earns 12.5% of the trade fee paid by wallets they brought in. The trade fee is 2%, so that is 0.25% of each trade. A recruiter also earns 15% of the graduation fee of coins those wallets create, which is 0.30% of the raise.
Earnings are paid in the chain's own coin and claimed in the Command Center under Rewards and claims. They depend on the real trading of your linked wallets, so they can be zero.