You’re comparing apples to oranges. 
Cartloom is a service that folks use IN ADDITION to a payment processor like PayPal.
There are many moving pieces to the online payment thing. And each different service collects their percentage. It’s annoying, but there it is.
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Credit cards
The credit card companies will charge a small percentage. It will vary depending on your monthly throughput.
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Exchange fees
If you’re collecting money internationally you’ll usually have to pay a surcharge for changing currencies.
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Other payment mechanisms
PayPal, Stripe, and Square are all payment processors – they take care of the above two things – and then add there own online payment mechanisms too (.e.g. PayPal). and charge another small fee.
When you see the 2.2% + 30¢ – it’s for that stuff above. And it’s also a minimum. It will be significantly more if you collect > $100 from a foreign country on an amex card (large numbers, foreign exchange, and some cards have higher surcharges)
But integrating PayPal/Stripe/Square (or all three) onto your site in a secure way is really really really hard to do. That’s where CartLoom (and other similar services like eJunkie come in). The handle the secure forms, collect and store the customer info, send receipts, calculate taxes, etc.
What we do at YourHead Software:
- We use Cartloom to collect customer info.
- We collect money through PayPal and Stripe.
This system has been humming along pretty nicely for since 2009 (i think – it’s been so long i’m actually not sure if it’s been 6 or 7 years – but a long time).