Commission rate
When you sell on Cambridge TCG, the platform takes a commission from your payout of 0%. There is no commission — on a P2P trade or an auction win, the seller keeps 100% of the sale. There are no tiers and no membership; the rate is the same for everyone.
Where this lives in code. The single per-item commission function —computeCommissionAmountinpackages/pricing/src/index.ts— returns0unconditionally, so no call site can charge a fee. Past trades keep the commission they were recorded with; only new sales are free.
The fuller story — why the platform is free, what it means for buyers, and an honest comparison against eBay, TCGplayer, Cardmarket and Whatnot — lives at /methodology/fees.