How to flip Dragon warhammer in OSRS

Flipping Dragon warhammer on the Old School RuneScape Grand Exchange currently makes about -99,316 gp profit per item after the 2% GE tax: buy near 13,800,000 gp (the instant-sell price) and re-list near 13,980,289 gp (the instant-buy price).

• Buy at (instant-sell): 13,800,000 gp
• Sell at (instant-buy): 13,980,289 gp
• Margin after 2% tax: -99,316 gp (-0.72% ROI)
• Buy limit per 4 hours: 8
• 24h volume: 1,964 (liquid)
• Max profit per limit cycle: -794,528 gp on 110,400,000 gp of capital

The flip, step by step

1. Place a buy offer at or just above 13,800,000 gp (the current instant-sell price).
2. Wait for the fill. Dragon warhammer is liquid right now, so expect fills within the hour at reasonable prices.
3. Re-list at or just below 13,980,289 gp (the current instant-buy price).
4. The GE takes 279,605 gp tax (2%) per item when it sells, leaving -99,316 gp profit each.
5. Repeat up to the buy limit (8 per 4 hours), a full cycle is -794,528 gp on 110,400,000 gp of capital.

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