You need to state your pricing structure clearly. Saying that you charge 2% over what Stripe charges makes it seem like you are hiding the total cost of transactions. Using Helium would cost people 4.5% plus 25 cents, am I right?
I also see that you are testing the response from HN. Well done. But the landing page for HN and regular visitors are the same. Why not run some quick tests with all the traffic?
You might have branding issues with the project Blimp (getblimp.com). The founders are really cool guys, but do chat with them about it.
The design is top-notch, though a button or link that scrolls down to the area with more information should be tested. Right now, the first impression you get is that this is an empty landing page.
A demo would also be nice.