How to flip Watermelon seed in OSRS

Flipping Watermelon seed on the Old School RuneScape Grand Exchange currently makes about 11 gp profit per item after the 2% GE tax: buy near 57 gp (the instant-sell price) and re-list near 69 gp (the instant-buy price).

• Buy at (instant-sell): 57 gp
• Sell at (instant-buy): 69 gp
• Margin after 2% tax: 11 gp (19.30% ROI)
• Buy limit per 4 hours: 200
• 24h volume: 131,491 (extremely liquid)
• Max profit per limit cycle: 2,200 gp on 11,400 gp of capital

The flip, step by step

1. Place a buy offer at or just above 57 gp (the current instant-sell price).
2. Wait for the fill. Watermelon seed is extremely liquid right now, so offers at fair prices typically fill within minutes.
3. Re-list at or just below 69 gp (the current instant-buy price).
4. The GE takes 1 gp tax (2%) per item when it sells, leaving 11 gp profit each.
5. Repeat up to the buy limit (200 per 4 hours), a full cycle is 2,200 gp on 11,400 gp of capital.

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