Very BAD SUPPORT, VERY BAD WEBSITE. I waited 7 hours for change my daily sending limit. I sent a lot of mail. After 6 hours they said our engineer is not here :-). I think they don't know BTC is a currency :-). When they increase my sending limit, i sent all btc. But they set Fee per byte was 2.453 sat/B and Fee per weight unit was 1.003 sat/WU. I bought the accelerator and did the process. They wanted to stuck my btc. Everybody know this fees imposible for btc transfer :-)