Fyndpuls
Fyndpuls answers the one question that matters before you buy: is this actually a good deal? It estimates an honest market value from 140,000 real sold prices across marketplaces and auctions, scores every listing, and surfaces the true finds before anyone else spots them.
- Year
- 2026
- Status
- Live
- Stack
React
Supabase
Vercel
Claude
ChatGPT
Lovable
- What I built
- I owned the product end to end, the concept, the value-check logic, the feed structure, and the AI prompts that classify and price each listing.

How it works
- 01
The value is anchored in real final prices from Tradera and Auctionet. A listing is judged against what things actually sold for, not against other asking prices.
- 02
A valuation needs at least three real sold comparables behind it. Below that the product says the basis is missing instead of showing a number.
- 03
Finds are graded rather than flagged once: ten percent under the comparable sold price counts as a find, twenty-five as a big one, forty as the top grade, and the email watch only fires at forty so an inbox stays worth opening.
- 04
When the comparables cover several variants, the result is shown as a range rather than an average that cannot be substantiated.
- 05
Every valuation with a credible basis is followed to the actual hammer price when the Tradera auction ends, so the engine is scored against outcomes rather than its own confidence. The backtest on the method page ran on 1,393 finished auctions, using only comparables sold before each hammer.
- 06
The rule the whole thing is built on: it does not guess. If the evidence is thin it says so, and shows the user the underlying listings to judge for themselves.
- Decision 1
Rank by deal strength, not just keywords, quality over volume.
- Decision 2
Two ways in to a valuation, a photograph or a pasted link, so the estimate is always one step away.
- Decision 3
Keep the human in the loop: the engine recommends, the user decides.

Happy to walk through the thinking, the trade-offs and where it's headed next.
Get in touch