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Built for sellers who care what they keep
What Profit is a UK-focused hub: marketplace fee calculator, guides, tools, Fee Watch, and a seller checklist.
Marketplace marketing talks about reach. Sellers need contribution. We model transparent UK fee estimates so you can rank channels before you list — then read guides that connect fees to returns, ads, postage, and ops.
Numbers here are decision aids, not invoices. Categories, promotions, and programme terms change. Confirm live rates, and read our fee assumptions.
Some tool links may be affiliate links — see the affiliate disclosure.