Cosmic rune
Used for enchant spells.
Cosmic rune is a free-to-play item on the OSRS Grand Exchange. Recent trades put the high price at 134 GP (1m ago) and the low price at 130 GP (2m ago). Buying at the low price and selling at the high price would leave 2 GP per item after the 2% tax (1.54% of the buy price). You can buy up to 18,000 every four hours. High Alchemy would lose 266 GP per cast if you bought it at the low price and paid for the nature rune. 15,513,795 were traded in the last 24 hours.
| High | 134 GP () |
|---|---|
| Low | 130 GP () |
| Tax | 2 GP |
| Margin | 2 GP |
| ROI | 1.54% |
| Buy limit | 18,000 every 4 hours |
| High alchemy | 30 GP |
Buy price (insta-sell / low): 130 GP
Sell price (insta-buy / high): 134 GP
Margin after tax: 2 GP per unit. Grand Exchange tax on a sale is 2 GP.
Buy limit: 18,000 every 4 hours.
The full buy limit of 18,000 Cosmic rune costs 2,340,000 GP at the current buy price. Across that quantity, the after-tax margin is 36,000 GP.
- Grand Exchange buy limit: 18,000 every 4 hours
- Free-to-play item
- High alchemy value: 30 GP
- Low alchemy value: 20 GP
- Base value: 50 GP
Cosmic rune price history
- Over the past 7 days, the average high ranged from 107 GP to 139 GP across 168 hourly samples. From 2026-11-01 UTC to 2026-11-08 UTC, it moved from 115 GP to 134 GP (+19 GP, +16.52%).
- Over the past 30 days, the average high ranged from 100 GP to 145 GP across 719 hourly samples. From 2026-10-09 UTC to 2026-11-08 UTC, it moved from 132 GP to 134 GP (+2 GP, +1.52%).
- Over the past 90 days, the average high ranged from 100 GP to 149 GP across 2,137 hourly samples. From 2026-08-10 UTC to 2026-11-08 UTC, it moved from 127 GP to 134 GP (+7 GP, +5.51%).
- Over the past 90 days, the highest average high was 149 GP on 2026-08-25 UTC, and the lowest was 100 GP on 2026-10-22 UTC.
As of 2026-11-08 UTC. See this week's market summary.
To cite this page: QuantScapers, "Cosmic rune price history", based on OSRS Wiki real-time price data through 2026-11-08 UTC. Calculations by QuantScapers.
What is the Grand Exchange buy limit for Cosmic rune?
You can buy up to 18,000 Cosmic rune every 4 hours on the Grand Exchange.
Is Cosmic rune a members-only item?
Cosmic rune is available to free-to-play players. No membership is required to trade it.
What is Cosmic rune's current buy and sell price?
At the latest update, Cosmic rune's insta-sell (low) price is 130 GP and its insta-buy (high) price is 134 GP on the Grand Exchange.
How much Grand Exchange tax applies to Cosmic rune?
A sale of Cosmic rune pays the standard 2% Grand Exchange tax, which is 2 GP per unit at the current price.
What does a full buy limit of Cosmic rune cost?
Buying the full limit of 18,000 Cosmic rune costs 2,340,000 GP at the current insta-sell price of 130 GP each.