How to flip Cadantine potion (unf) in OSRS

Flipping Cadantine potion (unf) on the Old School RuneScape Grand Exchange currently makes about 51 gp profit per item after the 2% GE tax: buy near 2,145 gp (the instant-sell price) and re-list near 2,240 gp (the instant-buy price).

• Buy at (instant-sell): 2,145 gp
• Sell at (instant-buy): 2,240 gp
• Margin after 2% tax: 51 gp (2.38% ROI)
• Buy limit per 4 hours: 10,000
• 24h volume: 629,908 (extremely liquid)
• Max profit per limit cycle: 510,000 gp on 21,450,000 gp of capital

The flip, step by step

1. Place a buy offer at or just above 2,145 gp (the current instant-sell price).
2. Wait for the fill. Cadantine potion (unf) is extremely liquid right now, so offers at fair prices typically fill within minutes.
3. Re-list at or just below 2,240 gp (the current instant-buy price).
4. The GE takes 44 gp tax (2%) per item when it sells, leaving 51 gp profit each.
5. Repeat up to the buy limit (10,000 per 4 hours), a full cycle is 510,000 gp on 21,450,000 gp of capital.

Margins move constantly. Re-check the live Cadantine potion (unf) numbers and price chart on GrandExchange.com right before committing.