Sort:  

Maybe a good start would be steembottracker where already a lot of bots are listed.
Also some information can be found be checking the comments of the @transparencybot
Maybe you can contact them, they maybe will have a good list of the upvote bots.
Looking forward to the results!
Cheers,
Peter

Coin Marketplace

STEEM 0.21
TRX 0.26
JST 0.039
BTC 96177.02
ETH 3370.51
USDT 1.00
SBD 3.07