Hello
whattomine not listed BTCZ
so Many miners do not have BTCZ information
ccex api is blocking whattomine
and whattomine support this exchanges
Abucoins
Bitfinex
Bittrex
Bleutrade
Cryptopia
HitBTC
Poloniex
YoBit

to solve the problem
1-whattomine nblock ccex api.
2- BTCZ add to one of the this exchanges