There's 2 grups of pools synced running 2 different/separate chains at different yet similar difficulties

These pools are running together ahead as far as blocks are concerned
http://usde.poolerino.com
http://usde.ixhash.com




These pools are running together behind as far as blocks are concerned
http://usde.coinium.org
https://usde.hash.so
http://usde.hashrate.eu