In case of "lowest" house edge then I can say that 999dice has the lowest one because their HE is 0.1% but I would not recommend you to put your money on that site because there are many scam accusations against 999dice.
There were also some moneypot apps that has variable house edge starting from 0.1% as well but I'm not really sure if the apps are still alive or not.
999dice is not even worth mentioning as a legit dice site- it is an obvious scam,multiple accusations and the shady verifier
and 0.1% HE is too low to be true anyways
among the trusted casinos, crypto-games offer low 0.8% HE but on dice only,the usual HE is 1%
bitsler,bitvest,primedice,yolodice,kingdice,duckdice etc. all operate with 1 % HE,it is the industrie's standard nowadays
some moneypot apps offer lower HE,but I,myself,prefer not to gamble there
you should always check if the casino you are planning to play at is legit and read about it first,low HE is good
but to be able to get your winnings after is much better