How to flip Raw manta ray in OSRS

Flipping Raw manta ray on the Old School RuneScape Grand Exchange currently makes about -4 gp profit per item after the 2% GE tax: buy near 855 gp (the instant-sell price) and re-list near 868 gp (the instant-buy price).

• Buy at (instant-sell): 855 gp
• Sell at (instant-buy): 868 gp
• Margin after 2% tax: -4 gp (-0.47% ROI)
• Buy limit per 4 hours: 15,000
• 24h volume: 373,653 (extremely liquid)
• Max profit per limit cycle: -60,000 gp on 12,825,000 gp of capital

The flip, step by step

1. Place a buy offer at or just above 855 gp (the current instant-sell price).
2. Wait for the fill. Raw manta ray is extremely liquid right now, so offers at fair prices typically fill within minutes.
3. Re-list at or just below 868 gp (the current instant-buy price).
4. The GE takes 17 gp tax (2%) per item when it sells, leaving -4 gp profit each.
5. Repeat up to the buy limit (15,000 per 4 hours), a full cycle is -60,000 gp on 12,825,000 gp of capital.

Margins move constantly. Re-check the live Raw manta ray numbers and price chart on GrandExchange.com right before committing.