XUSDTon Block Explorers
Tezos block explorers to view USDtz activity
Tezos Explorers
tzStats
tzStats.com is one of the best and one of the first Tezos block explorers
TzKT
TzKT is a powerful block explorer from the world famous Baking Bad team
Arronax
Cryptonomic's excellent flagship Tezos block explorer, in addition to its lighter, Mininax explorer
Better Call Dev
From the Baking Bad team, BCD is a smart-contract explorer for Tezos dApps