We've been using Shareit for selling software for many, many years and it's basically 4.9% as fees. The first interesting part for me is the currency conversion rate. We operate in GBP and all of our sales last month were in USD. Working out the average rate we got 1.54 USD to 1 GBP. Looking at the exchange rates for July [0] that seems reasonably close to the mid market rate.
I'd be interested to know how Stripe determine their conversion rates. If it's mid-market then we're looking at 4.4% against 4.9%.
The next issue when exporting is whether you have to register formally in the country you're selling to in order to avoid withholding taxes [1]
The countries we've come up against this to date are the USA, Portugal and India. The volume we do with the US justifies registering with the IRS and making a W8-BEN form available to all companies we sell to.
The process for the US is doable and the volume we sell there easily justifies it. The process for Portugal is awful and the process for India comprises about 6-8 weeks of utter bureaucratic bullshit [2]. The sales volume from these countries were not worth going through the process.
If we didn't go through this process and sell directly in these countries the buyer would have to withhold a proportion of the purchase, usually around 20%.
Shareit is an actual reseller, legally. Stripe isn't, AFAIK. So, Shareit can deal with the admin in these countries and pass over the same amount they do as for any country. A few years ago, we hadn't heard of withholding taxes, it's becoming more and more common as countries try to clamp down on tax evasion.
It's more strictly enforced the larger the payment amount gets, but my point is to be aware of the legal differences in payment processing services regarding foreign withholding tax rules.
Edit : There's actually a third issue as well and that's whether your insurance covers you to take card information on your site (up to details regarding the type of SSL certificate you have installed) and, if it does, whether you comply with all the security constraints the policy imposes. You may find that the additional premium is more than the cost savings.
[0] http://www.xe.com/currencycharts/?from=GBP&to=USD&view=1Y
[1] http://en.wikipedia.org/wiki/Withholding_tax
[2] http://homepage.ntlworld.com/dallaway/pan-card-uk-company.ht...