Astral rune

Astral Rune is a members-only item on the OSRS Grand Exchange in the runes category.

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

It has a Grand Exchange buy limit of 25,000 every four hours, a high alchemy value of 30 gp, and item ID 9075.

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Astral Rune currently has a flip margin of −1 gp, which isn't profitable to flip right now despite 9,415,896 trades over the last 24 hours.

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