Here is an in-depth mpesa agent commission table for deposit transactions.
DEPOSIT TRANSACTIONS COMMISSION

On average, the deposit commissions range between 12-17% across the various transaction bands. And as you have noted, Safaricom has introduced a new Kshs.0- 49 transaction band to cater for small transfers.
The restructuring of the deposit transaction bands is also intended to discourage deposit split which has been rampant among dishonest Mpesa agents.
WITHDRAW TRANSACTIONS COMMISSION

As usual, the more the transactions, the more will be your monthly earnings.