How to flip Stony basalt in OSRS

Flipping Stony basalt on the Old School RuneScape Grand Exchange currently makes about 108 gp profit per item after the 2% GE tax: buy near 987 gp (the instant-sell price) and re-list near 1,117 gp (the instant-buy price).

• Buy at (instant-sell): 987 gp
• Sell at (instant-buy): 1,117 gp
• Margin after 2% tax: 108 gp (10.94% ROI)
• Buy limit per 4 hours: 10,000
• 24h volume: 17,555 (very liquid)
• Max profit per limit cycle: 1,080,000 gp on 9,870,000 gp of capital

The flip, step by step

1. Place a buy offer at or just above 987 gp (the current instant-sell price).
2. Wait for the fill. Stony basalt is very liquid right now, so offers usually fill within minutes to a quarter hour.
3. Re-list at or just below 1,117 gp (the current instant-buy price).
4. The GE takes 22 gp tax (2%) per item when it sells, leaving 108 gp profit each.
5. Repeat up to the buy limit (10,000 per 4 hours), a full cycle is 1,080,000 gp on 9,870,000 gp of capital.

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