How to flip Grubby key in OSRS

Flipping Grubby key on the Old School RuneScape Grand Exchange currently makes about 108 gp profit per item after the 2% GE tax: buy near 33,800 gp (the instant-sell price) and re-list near 34,600 gp (the instant-buy price).

• Buy at (instant-sell): 33,800 gp
• Sell at (instant-buy): 34,600 gp
• Margin after 2% tax: 108 gp (0.32% ROI)
• Buy limit per 4 hours: 11,000
• 24h volume: 6,541 (liquid)
• Max profit per limit cycle: 1,188,000 gp on 371,800,000 gp of capital

The flip, step by step

1. Place a buy offer at or just above 33,800 gp (the current instant-sell price).
2. Wait for the fill. Grubby key is liquid right now, so expect fills within the hour at reasonable prices.
3. Re-list at or just below 34,600 gp (the current instant-buy price).
4. The GE takes 692 gp tax (2%) per item when it sells, leaving 108 gp profit each.
5. Repeat up to the buy limit (11,000 per 4 hours), a full cycle is 1,188,000 gp on 371,800,000 gp of capital.

Margins move constantly. Re-check the live Grubby key numbers and price chart on GrandExchange.com right before committing.