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only the sites having 4% cutoff has .electroneum.com

Yup... All are official mining pools created by the company.

https://eupool.electroneum.com - total fee 4%
https://uspool.electroneum.com - total fee 4%
https://asiapool.electroneum.com - total fee 4%

they are not paying right now, I still have pending balance on asiapool.electroneum and eupool.electroneum.

Those pools have pretty high minimum payment threshold and long block discovery time... I haven't got any payments since the pools started but pending balance keeps increasing...