"A" rated books
nitrogensports.eu A+ (2012)
betcoin.ag A- (2013)
bitcoinrush.io A- (2013)

"B"rated books
cloudbet.com B- (2013)

"C" rated books
jetwin.ps C+ (2013)
sportsbet.io C (2016)
anonibet.com  C- (2011)

"D" rated books
coinbet24.com D+ (2015)
1xbit.com D (2016)
lunarbets.eu D (2016)