The bank last week launched GSBank.com, a platform it inherited via the acquisition of a $16bn book of deposits from GE Capital.Through that deal it gained about 145,000 retail depositors and is now seeking more, offering annual interest rates of 1.05 per cent on a savings account — many times better than the rates of the biggest US brick-and-mortar lenders such as Citibank, JPMorgan Chase or Bank of America.