If you are looking high payer network then try sisterads, poptm or popads. I recommend http://sisterads.com its cpm rate is higher than poptm and popads. Also you can talk on skype if facing any issues quick live support. If you have good traffic then you can become premium publisher and will be paid daily cpc rate more than $5 for US/CA/AU/UK. GO to sisterads and ignore others