Grubby key

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

In-game examine text: "It looks like the key to a chest (Used to open the grubby chest in Forthos Dungeon)."

It has a Grand Exchange buy limit of 11,000 every four hours, a high alchemy value of 19 gp, and item ID 23499.

View on OSRS Wiki

Grubby Key shows an active flip setup with a margin of +1.5k gp and 4,341 trades over the last 24 hours.

At the buy limit of 11,000 every four hours, max profit per cycle is about 16.32m gp — high margin with healthy liquidity.