Cosmic rune

Cosmic Rune is a free-to-play item on the OSRS Grand Exchange in the runes category.

In-game examine text: "Used for enchant spells."

It has a Grand Exchange buy limit of 18,000 every four hours, a high alchemy value of 30 gp, and item ID 564.

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Cosmic Rune currently has a flip margin of −1 gp, which isn't profitable to flip right now despite 10,684,675 trades over the last 24 hours.

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