Catawiki Auction Deal Finder: Bid vs Expert Estimate

One call = one hunt across live Catawiki auctions. Catawiki's own experts publish a value estimate for every lot: this actor puts that estimate to work: it scans live auctions for whatever you're hunting, fetches each lot's current bid, and ranks everything by discount vs the expert's minimum estimate, with hours-to-close and reserve status attached. Built for AI agents, resellers and collectors.

{
    "query": "game boy",
    "deals": [
        {
            "title": "Nintendo - Gameboy Classic - Tennis - Game Boy (CIB)",
            "condition": "Estado: Buen estado",
            "currentBid": 15,
            "currency": "EUR",
            "estimateMin": 330,
            "estimateMax": 380,
            "discountVsEstimatePct": 95.5,
            "endsAt": "2026-07-08T17:11:30.000Z",
            "hoursLeft": 87.8,
            "reserveMet": false,
            "freeShipping": false,
            "url": "https://www.catawiki.com/es/l/..."
        }
    ],
    "meta": { "lotsFound": 158, "lotsAnalyzed": 12, "lotErrors": 0 }
}

Why the expert estimate matters

Every Catawiki lot is reviewed by one of their in-house experts, who publishes a min–max value estimate based on quality, rarity and provenance. That's a professional appraisal, per lot, for free: the missing reference price that raw auction scrapers don't give you. A lot bidding at €55 with a €550 minimum estimate three days before close is a signal worth watching; this actor surfaces exactly that, ranked.

Two honest caveats, structurally exposed in the output:

• reserveMet: false means the seller's hidden reserve isn't reached yet: the lot may not sell at the current bid. Filter with reserveMetOnly: true if you only want lots that will definitely sell.
• Early-auction bids are naturally far below estimates. Use endingWithinHours to hunt lots where the discount is real because the clock is almost out.

Input

Field	Default	Notes
query	:	What to hunt: "game boy", "omega seamaster", "lego star wars"
items	:	Batch of up to 10 queries, each may override any option
maxLots	20	Lots fetched in detail per query (max 40)
minDiscountPct	0	Keep lots at least this % below the min estimate
endingWithinHours	:	Only lots closing within N hours
reserveMetOnly	false	Only lots guaranteed to sell
strictClean	true	Drop lots whose title doesn't match your query (search is fuzzy)

Use with AI agents (MCP)

https://mcp.apify.com?tools=jdepablos/catawiki-deal-finder

Your agent gets a live "find undervalued auction lots" tool with structured, self-describing output: deals ranked, no pagination, no HTML. Pair it with a sold-price appraiser (e.g. eBay Sold Price Appraiser) and the agent can compare an auction's entry price against real market resale value before recommending a bid.

Pricing

Pay per event: one auction-scan per query analyzed (up to 40 lots fetched, ranked and returned). Scans that analyze no lots are never charged.

FAQ

Which Catawiki categories does it cover? All of them: the hunt is a free-text search across live auctions (watches, coins, comics, LEGO, retro games, art, wine…).

Are these sold prices? No: these are live auctions: current bid vs expert estimate. That's the point: you're early, not late.

How fresh is the data? Real-time at fetch. For monitoring, schedule the actor (e.g. every 6h) with endingWithinHours: 12 and act on what comes back.

Is this affiliated with Catawiki? No. Data comes from publicly visible auction pages.