Came across this when looking at Mastercard issuing firms.
They seem to be As A Service Provider like Algbra or Kestrl.
They offer a free USD account with a 3.2% savings rate paid daily. GBP account is $1.99 per month.
Card is a Red Mastercard and is $1.99 to get.
All in all they market as a “A Global USD Account”. So I guess if you want to save some USD might be a good account for that.