How do I revoke an access key?

Go to Account → Settings → AI assistants and click Revoke next to the key. It stops working immediately, and any assistant using it loses access on its next request.

Revoking doesn't cancel bids the key already placed. To withdraw those, open Account → Bids, pick the bid and choose Cancel bid.

Revoke a key if you pasted it somewhere public, if you've stopped using that assistant, or if you just want to reduce what a bidding key can do — make a new key with a lower cap and revoke the old one. You can hold up to 10 keys at a time, and each one expires on its own schedule.