Yes and no. It's not feasible for me, and I don't know you but I'm gonna go ahead and day it's not feasible for you either. The barriers to entry are extremely high, regulators need to be convinced you know what you're doing, as do banks, and you need to be accepted by enough places for it to be worthwhile people paying for things through you and merchants paying your fee to accept you. You can choose to do only parts of the payments processing picture and that's easier, but it's not easy. Bottom end startup costs would likely be in the hundreds of thousands, ignoring actually developing your payments platform (so just to get everyone onside and regulatory approvals etc), more realistically a budget of say low tens of millions might get one off the ground.