Volume tells you buyers exist. Sell-through tells you whether they will get to your listing. These are different questions, and the second one is the one that determines how long your money sits still.
Weekly sales volume is a count of what we watched leave the shelf. It is the number every brand page and category ranking leads with, and it is genuinely useful — a category with almost no departures is a category you should not be sourcing in, full stop.
But volume says nothing about supply. A thousand departures a week against two thousand active listings is a healthy market. A thousand departures a week against forty thousand active listings is a graveyard where your item is buried on page nineteen. Sell-through — departures measured against the standing inventory — is what separates those two cases, and they look identical if you only read volume.
When a brand becomes widely known as a good flip, supply arrives before demand does. Every reseller reads the same guides, sources the same brands, and lists them in the same week. The visible symptom is not falling sales — sales can hold steady — it is that individual listings take longer and longer to move, and that price cuts become the only reliable way to close.
This is why the top of a volume ranking is often the worst place to start. The leading brand in any category is the default choice for everyone, which means the price is efficient and the margin has already been competed away. The interesting rows are usually two to five places down, where demand is still solid and fewer people are looking.
Volume and sell-through are both snapshots. Momentum is the derivative — whether this week is running ahead of or behind the recent baseline. A category with flat volume and rising momentum is warming up; the same volume with falling momentum means you are buying into a market that is cooling, and by the time you list, the numbers you sourced against will be stale.
Momentum needs history to mean anything. A market you have only observed for a week has no baseline to compare against, and any momentum figure computed from it is noise dressed up as a signal — a board where every model is labelled the same way is telling you it cannot yet rank them, not that everything is hot at once. Treat any momentum reading from a short observation window with suspicion, ours included, and lean on volume and sell-through until the history is deep enough to rank against.
It is good for speed and it is a warning about pricing. Extremely fast sell-through often means the market is telling you the item was underpriced. If everything you list sells within 48 hours, raise your prices until it does not.
Search a specific model, note roughly how many active listings there are, then filter to sold and count how many moved in the last week or month. The ratio is crude but directionally useful. Doing it across five markets and a hundred models by hand is where it stops being practical.
Resale IQ turns a Vinted listing into one answer: BUY, WATCH, or SKIP — with buy-below price and best sizes.
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