Swordfish

Swordfish is a free-to-play item on the OSRS Grand Exchange in the weapons category.

In-game examine text: "I'd better be careful eating this!"

It has a Grand Exchange buy limit of 6,000 every four hours, a high alchemy value of 48 gp, and item ID 373.

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Swordfish currently has a flip margin of −4 gp, which isn't profitable to flip right now despite 608,814 trades over the last 24 hours.

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