Croissant is free to use. There's no cost to shop, to get buybacks, pay with Croissant at participating retailers or to use the extension, and no membership required. The only charge is the shipping fee when you send items to us to sell — here's how that works.
Shipping items in to sell
When you send items to Croissant to sell, a flat $15 shipping fee covers the prepaid label for your shipment — charged when you confirm your carrier at the end of a sale. Croissant Premium members ship free, every time (no cap). This isn't a cost to use Croissant — it covers the shipping label — and it only applies when you choose to send something in. See How to sell items with Croissant and What is Croissant Premium?.
Is there a paid plan?
Croissant itself is free. There's also an optional membership — Croissant Premium — that gives you more credit back when you shop, monthly credit, and free shipping when you sell. It's entirely optional; you never need it to use Croissant. See What is Croissant Premium?.