There is already a dicebot that has been developed by Seuntjie and is very popular. They have the option of playing in many dice sites and they include bitsler. Not sure if you have already seen their thread here - https://bitcointalk.org/index.php?topic=307425.0

Maybe this is what you need and it is free so why are you going to waste money in buying a service? Also many bots are actually loaded with scripts to withdraw your balance if you use them and give in your login id and many of them are also malware. But Seuntjie's dicebot is the only trusted one which is clean.

You also should be careful not to rely completely on the bot because using a bot does no change the odds. You will lose money in the long run for any EV- game.