How it works
Every product has limited places and one fixed participation fee. Reserve yours, estimate its market value and aim to be closest to the reference value.
Before each round opens, an independent reference value is established through a verified market study. It is encrypted, securely recorded for future audit and cannot be changed afterwards.
Choose a product
Explore the open rounds and choose a product whose market value you understand.
Review the fee and available places
Each round has a limited number of places and one fixed participation fee. Everyone pays exactly the same amount.
Assess the product
Review its specifications, condition and photographs, then decide what it is worth in today’s market.
Submit your estimate
Enter your informed market-value estimate in €0.50 increments. It remains confidential while the round is open.
Reserve your place
Pay the participation fee to confirm your place and register your estimate. You can then share the round to help fill the remaining places.
The round closes
A round closes when every place is filled or when its stated deadline passes.
Who comes first?
At closing, every eligible estimate is compared with the reference value established in advance. The estimate with the smallest distance comes first, whether above or below.
If every place is filled
If the round fills and your estimate is closest, there is nothing more to pay: the product is yours for the participation fee already paid.
If places remain unfilled
The closest estimator receives the first option to complete the purchase by paying only for the unfilled places. They have 24 hours to decide; this is an option, not an obligation.
If estimates are tied
If two or more estimates are exactly the same distance from the reference value, only those participants enter a 24-hour open tie-break. The outcome is never selected at random.
What to know before taking part
The participation fee is charged when you reserve a place and register your estimate. A round ending with unfilled places is not automatically cancelled: the closest estimator receives the first option to complete the purchase.
How is the reference value established?
Before a round opens, artificial intelligence analyses genuine market comparables. It considers the model, relevant attributes, condition and other material factors, excludes anomalous evidence and records both its sources and calculation. Once established, the value is protected and cannot be changed during the round.
What if my estimate is above the reference value?
That does not disadvantage you. Only the absolute distance between your estimate and the reference value matters. For example, if the reference value is €678.50, an estimate of €681.50 is €3 away and ranks ahead of €675, which is €3.50 away.
What happens if the round closes with places unfilled?
The closest estimator receives the first option to complete the purchase by paying only for the places left unfilled. At €5 per place, a round closing at 95 of 100 places would cost €25 to complete. The participant has 24 hours to decide. If they decline or do not respond, the option passes to the next-closest eligible estimate.
What happens if there is a tie?
If two or more estimates are exactly the same distance from the reference value, only those participants enter a 24-hour open tie-break. It starts at the amount required to complete the purchase. Only the successful participant pays the final amount; if payment is not completed in time, the option passes to the next valid offer.
Is my estimate confidential?
Yes. While the round is open, no other participant or seller can see it, and no provisional ranking is shown. After closing, the reference value and closest estimate are published so the result can be verified.
How do delivery, payment and refunds work?
Once the purchase is completed, the buyer confirms the delivery address and the seller dispatches the product with tracking, or both parties use the protected hand-delivery process. A short inspection period follows delivery before the seller’s proceeds are released. Refunds apply for platform or seller cancellation, charging errors, justified disputes, fraud or legal obligations. An incomplete round does not by itself make participation fees refundable. The service is currently available only in Spain.