I need invite,can someone give it to me?
Invite for what? I heard that Idena has some testnet node reward program? Is invite needed for this program? And how many coins is possible to earn here per month?
~4.5 per day on average from validation and ~5.8 per day on average from mining = 27$ per month per node. Validation is free (you can do it using shared node and web client), mining requires at least 5$/month VPS.