How to flip King worm in OSRS

Flipping King worm on the Old School RuneScape Grand Exchange currently makes about -85 gp profit per item after the 2% GE tax: buy near 4,284 gp (the instant-sell price) and re-list near 4,284 gp (the instant-buy price).

• Buy at (instant-sell): 4,284 gp
• Sell at (instant-buy): 4,284 gp
• Margin after 2% tax: -85 gp (-1.98% ROI)
• Buy limit per 4 hours: 13,000
• 24h volume: 39,931 (very liquid)
• Max profit per limit cycle: -1,105,000 gp on 55,692,000 gp of capital

The flip, step by step

1. Place a buy offer at or just above 4,284 gp (the current instant-sell price).
2. Wait for the fill. King worm is very liquid right now, so offers usually fill within minutes to a quarter hour.
3. Re-list at or just below 4,284 gp (the current instant-buy price).
4. The GE takes 85 gp tax (2%) per item when it sells, leaving -85 gp profit each.
5. Repeat up to the buy limit (13,000 per 4 hours), a full cycle is -1,105,000 gp on 55,692,000 gp of capital.

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