Cake

Cake is a free-to-play item on the OSRS Grand Exchange in the food category.

In-game examine text: "A plain sponge cake."

It has a Grand Exchange buy limit of 6,000 every four hours, a high alchemy value of 30 gp, and item ID 1891.

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Cake currently has a flip margin of −1 gp, which isn't profitable to flip right now despite 85,555 trades over the last 24 hours.

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