2026-10-12

No Reserve vs Reserve: The Math of Atom Auctions

A reserve auction sells at your floor or not at all; a no-reserve auction always sells, at a price you do not pick. The arithmetic behind Atom's published auction rules — the 150% BIN cap, bid increments, proxy bidding, the 72-hour payment window and the 10% commission.

Two auctions can look identical on the listing page and pay you very differently. One closes with money owed to you. The other closes with your name still in your account, a week older, having earned nothing — and nothing on the card tells you which one is which until you read the rules behind a single hidden number.

That number is the reserve.

We use auctions as the fast channel for names in a 158-domain portfolio, and reserve-versus-no-reserve moves the realised price more than the copy, the cover image or the theme of the event. This is the arithmetic instead.

What the two formats actually are

Atom's auction terms define a forward auction as a timed event — 5 to 7 days — where bidding increases from a starting price, and the reserve price as "the minimum price at which a seller is willing to sell". The consequence is stated bluntly on the same page: the domain remains unsold if the reserve price is not met.

So the two paths are not "sell high" and "sell low". They are:

• Reserve auction: you sell at or above your floor, or you do not sell at all.
• No reserve: you sell, at whatever the top bid happens to be. Guaranteed outcome, unguaranteed price.

Atom runs both: Public Auction Events "may have a reserve price", and the seller FAQ is explicit that a seller can set a reasonable reserve. Wholesale Liquidation Auctions go the other way: they start at $50, have no reserve, the highest bid wins, and if no bids come in the price drops by $10 every day until it hits $10.

The rule that decides whether you can run the auction at all

While a domain is listed in an auction, its nameservers must remain pointed to Atom until the sale completes, and any change to the nameservers automatically removes the domain from the auction. Domains also cannot be listed in external auction marketplaces at the same time.

So an auction is not a side activity. For 5 to 7 days the name is committed to one venue and one bidder pool — and an auction that ends unsold has still consumed those days, with the name unavailable everywhere else.

The arithmetic of a hidden floor

A reserve is not shown to bidders. They watch a bid number climb and do not know whether it has passed your floor. That asymmetry makes a reserve auction an expected-value calculation rather than a pricing decision.

Take a name you would accept $2,500 for. Assume the same name in the same event would sell no-reserve at $1,500. (Those are arithmetic assumptions, not a claim about any real sale — swap in your own numbers.)

• No reserve: you sell with certainty. Expected value ≈ $1,500.
• Reserve at $2,500: you are paid only if bidding reaches $2,500, so expected value = $2,500 × p, where p is the probability that it sells at all.

At p = 0.6 the two paths are worth exactly the same: $2,500 × 0.6 = $1,500. That equality is the whole decision:

• If the auction sells more than 60% of the time at a $2,500 reserve, the reserve is the better bet.
• If it sells less than 60% of the time, the reserve is worse than taking the market's $1,500.

The trap is that p is unknowable in advance, and sellers systematically overestimate it. A hidden floor that bidders never clear does not produce a low price; it produces no sale, and no sale feels free when there is no listing fee. It is not free. You have spent the week, held the nameservers, and learned nothing about what the market would actually pay. The only honest way to calibrate p is to run the same category both ways across events and write down what happened — which is why we log auction outcomes rather than auction intentions.

The BIN ceiling is a formula, not a preference

Here is the rule that quietly settles the argument for most sellers.

Atom allows a Buy It Now price to be added during an auction, with three conditions:

1. The auction must have a Reserve Price.
2. The auction must have received at least one bid.
3. The BIN price cannot be greater than 150% of the highest bid received so far.

Do the arithmetic on the third condition. If the highest bid stands at $400, the most you can set as BIN is $600. At a $1,000 high bid, your ceiling is $1,500. The BIN you are allowed to ask for is bounded by proof of demand you have already collected.

The second condition does the rest of the work: a no-reserve auction that never receives a single bid cannot add a BIN at all. There is no escape hatch. Every bid you never got is a door that stays shut.

That inverts the intuition most sellers start with. The instinct is that a reserve is the cautious choice and no-reserve is the aggressive one. In Atom's rulebook it is closer to the opposite: the reserve is what switches on the mechanism that lets you close a buyer at a premium, and the no-reserve auction is the one with no second move.

Once a BIN is set there is one more clock: for the first 24 hours only auction participants can buy at that price, after which it opens to non-participants.

Increments, proxy bids, and why bidder count is the real price

Atom publishes how its bid ladder works, and it is worth reading twice.

Increments scale with the current high bid. Atom's example: a domain sitting at a high bid of $75 might carry an increment of $5, while one at $10,000 carries an increment of $100. You can bid any amount, and the winner only pays one increment above the second-highest bid.

That should reframe the reserve question. Your final price is not set by the highest bidder's maximum. It is set by the runner-up — the second-highest bid, plus one increment. One bidder in the room means you sell at the starting price. Two determined bidders means the proxy war between them decides your number, and your only job was making sure the reserve did not sit above where their fight stops.

Proxy bidding follows the reserve too, and this is the detail sellers miss. If a bidder's maximum meets or exceeds your reserve, their bid is automatically raised to the reserve. If their maximum is below it, their bid rises only to their maximum. A hidden floor is therefore not just a gate — it is a magnet that can lift a proxy bidder's visible offer straight up to your number and lock in the sale the moment they cross it.

The end game: 5–7 days, a 60-minute extension, a 72-hour payment window

Bids placed in the final 10 minutes extend the auction by 60 minutes, so the end is elastic precisely when competition is real. All bids are binding and cannot be withdrawn — which protects your sale, and also means a bidder who over-extends is a payment risk rather than a regret.

Atom's terms state payment must be completed within 72 hours of auction close, and that failing to pay violates the terms and may bring penalties or suspension. Atom's auction page describes the consequence two ways: non-payment past the 72-hour window means the next highest bidder becomes the winner, while a separate line says a winning bidder who does not pay within 48 hours leaves the auction void, with the domain remaining with its current owner. The two lines do not reconcile — practically, a stalled payment means a delayed or lost sale, and any reserve calibrated on the assumption that a high bid always converts has a deadline attached.

Commission, renewal fees, and the number you actually bank

Auction sales have no listing fees. Atom charges a 10% commission on the final sale price, with a minimum of $3.

A $3,000 close leaves $300 in commission — $2,700 to you before transfer and payment costs. A $120 close leaves $12; a $25 close still leaves the $3 minimum. The commission is not the interesting part. The renewal fee is, because it changes what a bidder is willing to bid.

Winning auction domains transfer to AtomRegistrar, and any applicable renewal fee is included in the total winning bid amount; domains already registered at AtomRegistrar carry no renewal fee. Atom notifies bidders of renewal fees before they bid, and the renewal covers a full year. A buyer's true cost is therefore the bid plus the renewal — a $1,000 bid against a name carrying a $120 renewal is a $1,120 decision to them. When you choose a reserve, the renewal is part of the ceiling you are estimating, not a detail you bolt on afterwards.

The rules we now run the decision on

1. Set the reserve before you set the starting price. The starting price invites bidders; the reserve decides whether you sell.
2. Never open a reserve auction without a plan to unlock BIN. The BIN is capped at 150% of the highest bid, so the bid level you attract in the first 48 hours is also the ceiling of the offer you are allowed to make.
3. Treat no-reserve as a cash decision, not a bravado decision. It is the right call for a name you would otherwise let expire — which is exactly why Atom's wholesale liquidation format starts at $50 with no reserve and falls to $10. If the alternative is a renewal bill, ten dollars is a win.
4. Count the lock-up, not just the fee. There is no listing fee, but the nameservers stay on Atom for the duration and the name cannot run elsewhere meanwhile.
5. Write down what each auction actually returned. Reserve or not, the only way p stops being a guess is a log with a number in it next to every name.

The reserve is not a safety feature and no-reserve is not a strategy. One trades price for certainty; the other trades certainty for price. Every other auction rule — the BIN cap, the increments, the proxy magnet, the renewal on the buyer's side — either widens that gap or closes it, and all of them are published. The sellers who read them are bidding against arithmetic instead of optimism.

If you are pricing a name rather than auctioning it, the same logic runs through our write-up on the Atom Premium commission ladder and the name-server rule and the buy-now pricing and follow-up method we use across the 158 names currently listed in the portfolio.