Amazon eBay Best Buy Newegg Price Comparison by ASIN or UPC

What does Multi-Marketplace Price Checker do?

Multi-Marketplace Price Checker takes a list of ASINs, UPCs, model numbers or plain product names and returns what that exact product actually sells for right now on Amazon, eBay, Best Buy and Newegg. For every marketplace you get the highest, lowest and typical price, plus a clickable source URL behind each number, so any figure can be traced back to the offer it came from.

The hard part of cross-marketplace price comparison is not fetching pages, it is knowing that the thing you found is the same product. A search for one mouse returns its dock, its cable, a two-pack bundle, a refurbished unit and three different colourways. This Actor runs every candidate listing through an AI exact-match filter before any price is reported, so accessories, bundles, variants and open-box units never contaminate your market price.

Runs on Apify, so you get a REST API, scheduling, webhooks, monitoring, residential proxy rotation and exports to JSON, CSV, Excel or Google Sheets without writing any of it yourself.

Why use this Amazon, eBay, Best Buy and Newegg price comparison tool?

• Retail and online arbitrage sourcing. Check a sourcing list of hundreds of ASINs in one run and see instantly where each product resells highest.
• Reseller repricing. Know the going rate across four marketplaces before you set your own price, instead of guessing from one.
• Liquidation and wholesale buying. Price a manifest of UPCs before you bid on the pallet.
• Brand and distributor price monitoring. Watch what your product sells for across the channels you do not control.
• Competitive market research. Track price spread per channel to find where a category is over- or under-priced.
• Catalogue enrichment. Resolve a bare UPC or model number into a full product identity with brand, title, specs and Amazon URL.

How to use Multi-Marketplace Price Checker

1. Click Try for free.
2. Paste your identifiers into the Products field, one per line. Mix ASINs, UPCs, model numbers and product names freely.
3. Optionally uncheck marketplaces you do not care about, and set your US ZIP code so Amazon prices reflect the market you sell into.
4. Click Start. Watch the log as each product resolves.
5. Open the Output tab and export as JSON, CSV, Excel or HTML, or pull it from the API.

No proxy setup, no API keys and no configuration are required. Paid runs include a US residential network; the AI matching works out of the box with no key of your own.

Input

Set everything in the Input tab. Only Products is required.

Field	What it does
products	Identifiers to look up, one per line. ASIN, UPC/EAN, model number, or product name.
marketplaces	Which of Amazon, eBay, Best Buy and Newegg to price against. Fewer means faster and cheaper.
model	The AI model that verifies exact product matches. The cheap fast models are plenty.
zipCode	US delivery ZIP. Amazon prices and availability vary by location.
maxProducts	Stop after N products. 0 checks everything.
concurrency	How many products to check at once.
openrouterApiKey	Optional. Bring your own OpenRouter key to be billed by OpenRouter instead of through Apify.
proxyConfiguration	Optional override. Paid runs already include a US residential network.

{
    "products": ["B0DGHMNQ5Z", "097855174789", "Sony WH-1000XM5"],
    "marketplaces": ["Amazon", "eBay", "BestBuy", "Newegg"],
    "zipCode": "10001",
    "concurrency": 5
}

Output

One row per product. Download as JSON, HTML, CSV or Excel, or read it straight from the API.

{
    "input": "B09HM94VDS",
    "title": "Logitech MX Master 3S Wireless Performance Mouse",
    "brand": "Logitech",
    "upc": "097855172538",
    "model": "910-006556",
    "amazonUrl": "https://www.amazon.com/dp/B09HM94VDS",
    "amazonPrice": 99.99,
    "amazonStatus": "buy-box price found",
    "amazonHighest": 119.99,
    "amazonMostFrequent": 99.99,
    "amazonMostFrequentUrl": "https://www.amazon.com/dp/B09HM94VDS",
    "amazonOfferCount": 4,
    "ebayHighest": 109.95,
    "ebayLowest": 74.5,
    "ebayMostFrequent": 89.99,
    "ebayMostFrequentUrl": "https://www.ebay.com/itm/123456789012",
    "ebayOfferCount": 11,
    "bestBuyMostFrequent": 99.99,
    "bestBuyOfferCount": 1,
    "neweggMostFrequent": 104.99,
    "neweggOfferCount": 2,
    "marketplacesWithOffers": 4,
    "notes": null
}

Data fields

Field	Description
input	The identifier you supplied for this row.
title, brand, model, upc	Resolved product identity, from the Amazon detail page.
description	Key specifications, pipe separated.
amazonUrl	Canonical Amazon product page the reference data came from.
amazonPrice	The product's own featured-offer (buy box) price.
amazonStatus	Why the buy-box price is what it is: found, unavailable, no featured offer, 404, no match for the identifier, or blocked.
<market>Highest / HighestUrl	Highest verified price on that marketplace, and the offer it came from.
<market>Lowest / LowestUrl	Lowest verified price, and its offer.
<market>MostFrequent / MostFrequentUrl	The typical going rate: the modal whole-dollar price across verified offers. Use this one.
<market>OfferCount	How many offers were confirmed to be the same product.
marketplacesWithOffers	How many selected marketplaces returned at least one verified offer.
notes	Per-row warnings, such as a marketplace that could not be reached.

<market> is one of amazon, ebay, bestBuy, newegg.

A null price is not a zero price. Null means the product was never verified on that marketplace, either because nothing matched or because the site could not be reached. 0 is never used as a stand-in, and an unreachable site is always named in notes. That distinction is what keeps the data safe to make buying decisions on.

How much does it cost to compare prices across marketplaces?

You are charged per product found, plus a small amount per marketplace that returns a verified price, so a run costs in proportion to the answers you actually get.

Lookups that find nothing are free. If an identifier cannot be resolved to a product, because the ASIN is dead, the barcode matches nothing, or the page could not be loaded, you are not charged for it at all. The row still appears in your output so you can see which identifier failed and why, but it costs you nothing.

AI model usage is billed separately by Apify's OpenRouter integration, not by this Actor, so you are never charged twice for the same call. Supply your own openrouterApiKey and that usage moves to your own OpenRouter account instead.

Free plan runs are capped at 2 products per run and use Apify Proxy residential on your own account. Paid runs lift the cap and include a bundled US residential network at no extra cost. Upgrade your Apify plan to unlock the full list.

Tips for accurate results

• Prefer ASINs and UPCs over product names. They resolve to exactly one product; a name can resolve to the wrong variant.
• Set the ZIP code to your actual market. Amazon quotes different prices and availability by delivery location.
• Raise concurrency for long lists, lower it if sites start refusing. The Actor backs off and retries on its own, and logs every retry, but a gentler rate finishes more reliably.
• Trust MostFrequent over Highest for pricing decisions. The highest offer is often an outlier seller; the modal price is the real market.
• A 404 is confirmed, not assumed. Amazon serves 404s to exits it is throttling, so a product is only reported as not found once several separate exits agree. A single bad response never turns a live product into a missing one.
• Interrupted runs resume. Progress is checkpointed per product, so a migrated or restarted run continues instead of re-checking and re-charging for products already done.

FAQ

How do I compare Amazon prices to eBay in bulk?

Paste your ASINs into the Products field and select both Amazon and eBay. Each row returns both marketplaces' typical, highest and lowest verified price side by side.

Can I look up products by UPC instead of ASIN?

Yes. UPC, EAN, manufacturer model number and plain product names all work in the same field. Non-ASIN inputs are resolved through Amazon search first, then priced normally.

How does it avoid matching the wrong product?

Every candidate listing goes through an AI filter that keeps only exact brand and model matches, and explicitly rejects bundles, accessories, different variants, and refurbished or open-box units. If that filter cannot run for a marketplace, that marketplace reports nothing rather than an unverified price.

Which AI model should I pick?

The default, GPT-4o mini, was chosen by benchmarking candidates against real eBay result sets. It was the most precise at rejecting listings that are not your exact product, and it costs roughly $0.003 per product checked. Cheaper models let noticeably more junk through: on a Sony WH-1000XM5 test one accepted a $130 and a $486 listing, neither of which is a new unit of that product.

Why is a price null instead of a number?

Because nothing was verified there. Either no listing matched the product, or the marketplace could not be reached. Check the notes field, which names any marketplace that failed.

Why are all my prices empty with an "AI access unavailable" error?

Your Apify plan cannot start the public Actor that provides the built-in AI matching. Either upgrade your Apify plan, or fill the OpenRouter API key input to use your own OpenRouter account. Without one of the two, nothing can be verified and every price stays empty.

Do I need an OpenRouter or proxy API key?

Normally no: AI matching runs through Apify's built-in access and paid runs include a residential network. The one exception is an Apify plan that cannot start public Actors, which is what the built-in AI access is; on those plans you must supply your own OpenRouter key.

Can I run this on a schedule?

Yes. Use Apify's scheduler to re-run your product list daily or weekly, and connect a webhook or integration to push the results into Sheets, Slack, or your own database.

Can an AI agent call this Actor?

Yes. It is callable from any AI agent through the Apify MCP server, and its input and output schemas are published so an agent can discover the fields without documentation.

Is scraping marketplace prices legal?

This Actor collects only publicly available listing data, with no login and no personal information. Publicly accessible price data is generally considered legal to collect, but you are responsible for how you use it and should seek your own legal advice for your use case.

Support

Found a bug or a marketplace that stopped parsing? Open a ticket on the Issues tab and it gets looked at.

💼 Need a custom version, another marketplace, or a different output shape? Email youssefarhan24@gmail.com 🌐 Got a site you want scraped? Suggest it here ⚡ Upgrade your Apify plan to lift the free-tier cap.