How to flip Astral rune in OSRS

Flipping Astral rune on the Old School RuneScape Grand Exchange currently makes about -1 gp profit per item after the 2% GE tax: buy near 95 gp (the instant-sell price) and re-list near 95 gp (the instant-buy price).

• Buy at (instant-sell): 95 gp
• Sell at (instant-buy): 95 gp
• Margin after 2% tax: -1 gp (-1.05% ROI)
• Buy limit per 4 hours: 25,000
• 24h volume: 20,757,072 (extremely liquid)
• Max profit per limit cycle: -25,000 gp on 2,375,000 gp of capital

The flip, step by step

1. Place a buy offer at or just above 95 gp (the current instant-sell price).
2. Wait for the fill. Astral rune is extremely liquid right now, so offers at fair prices typically fill within minutes.
3. Re-list at or just below 95 gp (the current instant-buy price).
4. The GE takes 1 gp tax (2%) per item when it sells, leaving -1 gp profit each.
5. Repeat up to the buy limit (25,000 per 4 hours), a full cycle is -25,000 gp on 2,375,000 gp of capital.

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