The E-2 requires that the money be from a company or individual of the same nationality as the E-2 applicant; it also can come from the E-2 applicant himself or herself. Revenue generated by the U.S. company doesn't count unless the revenue then were given in the form of profits or dividends to the E-2 applicant and reinvested into the U.S. company. The other option is the E-1 treaty trader visa, which doesn't require any minimum investment but instead requires the existence of substantial trade between the U.S. and the E-2 applicant's country of nationality so this is usually an option for more mature companies. So, the O-1 is probably the better option because it's possible to get an O-1 as a founder (of your own company) and there's no minimum investment or business activity requirement.