Auto reply to a keyword on twitter

I searched this forum and google a lot but i don't find a bot which can do what i want .... i know that tweet attack was a bot which was used much for that ... but it does not exist anymore. Tweetadder is a other bot i tester but this bot is only to get a lot of friends ... i don't need this stuff ...

i only want a ( little bit random if it possible ) auto reply to Keywords which i choose .... when the bot makes that good i want to spend money for that ...

Is at the time a bot avaible which has this option ?

p.s i dont want to spam twitter with 1000000 tweets ... only to guys which could be interesserted in my product. I am no bad spammer

no one any idea ? Is therefore no bot out there ?

might want to see if some of the programers here can make something like that for you. I have not seen anything remotely close to what you are asking.
good luck
Regards