One-stop-shop accountants will charge you 50-100 euros/mo and take care of everything.
They don't tax revenue, just distributed profits. As long as you keep the money in the business (even investing) or take a salary, you won't pay taxes in Estonia (assuming you don't live there).
But not with Stripe, which always gives you a Delaware C corp as far as I understand. And if there's a Stripe equivalent from Estonia I have yet to find it, despite all the promotion their government does around "e-residency".
Edit: oh nevermind https://support.stripe.com/questions/supporting-companies-th...
(anyhow, Estonia borders Russia, invest at your own peril)
That would be Xolo.io - but you really don't need a Stripe equivalent in Estonia or most places to incorporate. Registering a company is not that hard most places. I wouldn't recommend Estonia because you still need to open a business bank account for your new entity, that's the hard part.
You don't need a C corp for a project like OP. He would want a bog standard LLC which is fiscally transparent for U.S. tax purposes. It gets more conveluted if he himself is not from the US as it would be treated differently by different countries.
But it isn't hard, it is just boring to get going.
I mean I am in Denmark and it isn't that difficult, and believe me Denmark is more difficult and entrepreneur unfriendly than most Western countries.