I sometimes feel like I'm the last to hear about things because I'm not that socially-oriented, but I've been making my living through crowdfunded fiction for three years now and I just found out about PayPal's micropayment rate.
In case anybody else is as bereft of clue as I was: you go to
this page (note: the page may not work in some browsers) and sign up. It takes about two business days for PayPal to switch you over. Once activated, the new rate applies to all transactions where money is sent to you. What it does is make the transaction fee equal to $0.05 + 5% (international rates vary).
For transactions up to about $12, this makes a huge difference. If someone sends you a buck under the regular rats, you'll lose about a third of it. With the micropayment rate, you keep 90% of it.
You pay a bit more for larger transactions, but not so much that it'll make a difference when most of your money comes in in dribs and drabs. I doubt many crowdfunded authors see as many large donations as I do, and it's still more cost effective for me to be on micropayments. On a $300 payment, for instance, there's about a $6 difference. It doesn't take many smaller payments to make up and exceed that.
If you're not on micropayments, give a quick thought to how most of your money comes in. If it's in the $1-10 range, you'll definitely benefit. If you're mostly selling things in blocks of money in the $15-20 range and up, you probably won't. While it's more involved than a check box in your PayPal dashboard, you can have it changed in the future if you go to micropayments and your situation later changes.
I also think we should update any tip/instructional posts that refer people to PayPal in order to reflect this information, as it will be invaluable to most crowdfunders from the beginning.