u can use free bots but while using it dont say to attack mobs and dont start it for more than an hour for any time
if u use that for too much time u will definately get a ban

i use Dbot for 1 to 1 and half hour in day

it collects 2500 to 3000 Uri in hour
some times it give a message
bot was stopped forcely by remote host #10054 error
any one know what it means