When you try to register an expired .eth domain, the Price Cooldown is a cost you cannot ignore. This premium starts at $100 million and decays exponentially to 0 over 21 days. It is not a small amount, and it does not go down in a straight line. What you really need to figure out is not just "how much is this domain worth," but at which point on the decay curve you are willing to act, and whether the total cost at that point is still lower than your own valuation of the domain.
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What Exactly Is the Price Cooldown
After a .eth domain expires, it first enters a grace period. During this time, the original owner can still renew it at the normal price, and no one else can register it. Once the grace period ends, the domain enters the Price Cooldown. Anyone can register it, but in addition to the normal annual fee, you must also pay a one-time premium.
The purpose of this premium is not to make money for the platform. It is designed to prevent bots from grabbing domains. Without it, valuable domains would be swept up by scripts the moment the grace period ends, leaving ordinary users no chance. The high starting price forces everyone to wait. As the price keeps dropping, people with different valuations will enter at different times.
The Decay Curve: 21 Days of Exponential Decline
The premium starts at $100 million and decays exponentially to 0 over 21 days. Exponential decay means the price drops very fast in the beginning and very slowly near the end. It may fall by a huge amount on day one, but in the final days the drop is tiny. Near zero, it barely moves.
This means two things. First, people who enter early pay a much higher premium than those who enter late, but they get certainty in return: the domain is still there and has not been taken by someone else. Second, waiting has a cost. While you watch the price fall, others are watching too. By the time the price reaches a level you feel comfortable with, someone else may have already registered it.
The ENS App registration page shows the current total price in real time, including the base fee plus the current premium, as well as a countdown to when the premium reaches zero. That is the most direct reference for your calculation. You do not need to manually work out the decay curve.
A Simple Framework You Can Reuse
Suppose you are looking at a .eth domain with more than 5 characters. The base annual fee is $8. You plan to register it for 1 year, so the base registration fee is $8.
Now you need to decide how much extra premium you are willing to pay just to secure it. That number depends on your valuation of the domain and your judgment about whether others are watching it too.
If you value the domain at $500, your total budget cap is $500. Subtract the $8 base fee, and the maximum premium you are willing to pay is $492. You need to watch the current premium on the ENS App and wait until it drops below $492, then act. But remember, the decline is exponential. Most of the drop from $100 million to $492 happens early, so you may not need to wait many days. The exact current value is shown on the page in real time.
If you value the domain at $50, your premium cap is $42. That usually means you need to wait quite a long time, close to the end of the 21-day cycle. The risk is that during this time, someone else who values the domain more than you may register it before you at a premium of $100 or $200.
There is no single "best strategy." The longer you wait, the lower the premium, but the higher the chance someone else takes it. What you need to judge is how important this domain is to you and how much extra you are willing to pay for the certainty of getting it.
An Easily Overlooked Point: The Premium Does Not Get Multi-Year Discounts
ENS multi-year registration discounts only apply to the base registration fee. They do not apply to the Price Cooldown premium. If you register for 3 years, the base fee can get about a 31% discount, but the premium is not reduced by even one cent. So if you plan to hold long term, multi-year registration can lower the per-year base cost, but it does not help with the premium at all.
How to Know You Have Done the Math
The standard for knowing whether you have calculated the cost correctly is not "I remember the numbers $100 million and 21 days." You need to be able to find the target domain on the ENS App, see its current total price and countdown, and then make a clear decision: act at the current price, or keep waiting. If you keep waiting, you should know the highest premium you accept, and if the price goes above that number, you give up. If you impulsively place an order while the premium is still millions of dollars, or if you do not know the premium will eventually reach zero and think that is the final price, then you have not done the math yet.
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References
- ENS DAO Basics·ENS Protocol Revenue, 2026-10-25
- ens.dev·Price Cooldown, 2026-10-25
- ENS Documentation·ETH Registrar, 2026-10-25
- ens.dev·Pricing & Fees, 2026-10-25
