A couple years ago, I wrote a review about my great experience selling with swap.com. Later, I edited that review to drop a star because they seemed to be declining as far as customer service and turnaround time. Now, I'm sad to say that I can no longer recommend swap.com because they're dramatically increasing their fees and it's no longer worth it.
Now it costs a flat $11.90 just to send them a box, and the box size allowed has gotten much smaller. Wait 60+ days. Once they actually look at your box, they might reject most of your items. It depends heavily on which employee sorts them. I've sent in boxes of equal quality every time, and sometimes 95% is accepted, sometimes closer to 40%. Once you get everything posted up for sale, they take 30% PLUS $1.50. So if you want to sell a kid's t-shirt for $3.00, expect to make 60 cents. And you'll never actually see that 60 cents because it gets sucked up with the inbound service fee.
So, basically, if you decide to sell with swap.com, you'll be wasting your time to make pennies. It might be worth it if you're selling expensive items, but probably not because that stuff doesn't sell very well so it will just sit there. And swap.com is now saying they have the right to change the price of your items to whatever they want if they sit on the site too long. So, good luck with that.
It's really a shame, because this site was great for a couple years. Now I'll be participating in my local consignment sale instead, because I can make a lot more that way.
If you are a buyer and have store credit (which is the only thing you can get for returns,) I suggest using it soon, because once sellers catch on to the fact that they can't make any money, they'll stop selling. Then swap.com will have to close and you won't be able to use that credit anymore. I give it a year.
I attached a photo to show you what it looks like when they reject items. They encourage you to "donate" this stuff (to who knows where.) If you request to have it sent back to you, it comes in a big tangled ball.