Sinister key

Sinister Key is a members-only item on the OSRS Grand Exchange in the other category.

In-game examine text: "You get a sense of dread from this key."

It has a Grand Exchange buy limit of 11,000 every four hours, a high alchemy value of 48 gp, and item ID 993.

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Sinister Key currently has a flip margin of −110 gp, which isn't profitable to flip right now despite 9,100 trades over the last 24 hours.

Items with negative or zero margins like this are better watched than actively flipped until the spread widens.