Mercado Libre Buy Box Monitor — Who Wins, at What Price

US$0.008 per product checked + US$0.04 per run. Residential proxies in each product's country are included; blocked pages and unreadable products are never charged.

See who is winning the Buy Box of up to 500 Mercado Livre / Mercado Libre catalog products in one run: the winning seller, price, old price, Full and free-shipping flags, reputation level and official-store badge, plus how many offers the product has and the lowest price (Mexico, Argentina, Colombia and Chile). Add your own listings or seller ID and every row tells you whether you are the one winning.

• Up to 500 catalog products per run, any mix of Brazil, Mexico, Argentina, Colombia and Chile.
• isMineWinning on every row once you add your listing IDs or seller IDs, with the name and price of whoever is winning instead.
• Offers count and lowest price in 4 of the 5 countries (MX, AR, CO, CL), with winnerAboveMinBy showing how far the winner is above the cheapest offer.

Built for sellers, agencies and brands that need to know, every morning, which products they are winning, which they lost and to whom.

Em português: acompanhe quem ganha o Buy Box de até 500 produtos de catálogo do Mercado Livre (e do Mercado Libre no México, Argentina, Colômbia e Chile): vendedor vencedor, preço, Full, reputação, quantidade de ofertas e menor preço. Informe seus anúncios ou seu ID de vendedor e veja se é você quem está ganhando.

En español: consulta quién gana el Buy Box de hasta 500 productos de catálogo de Mercado Libre: vendedor ganador, precio, Full, reputación, cantidad de ofertas y precio mínimo. Agrega tus publicaciones o tu ID de vendedor y mira si eres tú quien gana.

Who it is for

• Sellers: add your seller ID and get every morning the list of catalog products where isMineWinning is false, with the seller who beat you and its price.
• Agencies: one run covers the catalog products of several clients; each client's seller IDs go in My seller IDs.
• Brands watching resale: see which reseller holds the Buy Box of your products, at what price, and whether it is your official store.
• Pricing analysts: winnerAboveMinBy shows when the Buy Box is not won by the cheapest offer (MX, AR, CO, CL).

What you get

One row per catalog product. Example from a run on the Apify platform (Mercado Libre Mexico, an Oster air fryer with 31 offers), with a seller ID that is not the winner:

{
  "ok": true,
  "productId": "MLM41514595",
  "country": "MX",
  "title": "Oster Freidora de Aire Digital con Recubrimiento Oster DiamondForce, Ventana y Luz Interna, 4L de Capacidad, con 10 Programas Automáticos, CKSTAF40WDDF",
  "url": "https://www.mercadolibre.com.mx/oster-freidora-de-aire-digital-con-recubrimiento-oster-diamondforce-ventana-y-luz-interna-4l-de-capacidad-con-10-programas-automaticos-ckstaf40wddf/p/MLM41514595",
  "currency": "MXN",
  "winnerItemId": "MLM3421917534",
  "winnerSellerId": 1440328802,
  "winnerSellerName": "Oster México",
  "winnerReputation": "5_green",
  "winnerPowerSellerStatus": "platinum",
  "winnerIsOfficialStore": true,
  "winnerPrice": 999,
  "winnerOriginalPrice": 1436,
  "winnerFreeShipping": true,
  "winnerIsFull": true,
  "offersCount": 31,
  "minPrice": 999,
  "winnerAboveMinBy": 0,
  "isMineWinning": false,
  "checkedAt": "2026-10-28T12:00:00.000Z",
  "inputValue": "https://www.mercadolibre.com.mx/p/MLM41514595"
}

Field	Meaning
productId / country / title / url	The catalog product and its page
winnerItemId / winnerSellerId / winnerSellerName	The listing and seller currently holding the Buy Box
winnerReputation / winnerPowerSellerStatus / winnerIsOfficialStore	Reputation color level (5_green), seller level (platinum, gold...) and official-store flag
winnerPrice / winnerOriginalPrice / currency	The winner's price and crossed-out price (standard price, before payment-method discounts such as Pix)
winnerFreeShipping / winnerIsFull	Free shipping and Fulfillment (Full) flags of the winning listing
offersCount	How many new offers the catalog product has, winner included. Mexico, Argentina, Colombia and Chile only; null in Brazil, where the site does not show it
minPrice / winnerAboveMinBy	Lowest price among the offers and how far above it the winner is (0 = the winner is the cheapest). null when the site does not show the lowest price
isMineWinning	true if the winner is one of your listings or sold by one of your seller IDs, false if not, null when you did not provide any
error rows	{ "ok": false, "error": "...", "inputValue": "..." } for products that could not be read (blocked, no-winner, no-price, not-found...). They are never charged

What you can paste

• Catalog URL: https://www.mercadolivre.com.br/.../p/MLB62391404 (any text after the product, such as ?quantity=1, is ignored).
• Catalog ID: MLB62391404, MLM41514595, MLA74595470, MCO..., MLC.... It is the code after /p/ in the product URL.
• A catalog URL that also points to a listing (?pdp_filters=item_id:...) works: the product is read and the listing is ignored.
• A single-listing link (produto.mercadolivre.com.br/MLB-..., articulo.mercadolibre.com.mx/MLM-...) is not a catalog product: it comes back as not-a-catalog-product. Use the Price Monitor actor for those.

How to use it

1. Paste your products into Catalog products (up to 500, any mix of countries).
2. Optional: add My listing IDs and/or My seller IDs so isMineWinning is filled in.
3. Run it, or schedule it every few hours, and export to JSON, CSV or Excel. Compare isMineWinning between runs to see when you lose or recover a Buy Box.

Input	Type	Default	Notes
products	array of strings	— (required)	Up to 500 catalog URLs or IDs; duplicates removed
myItemIds	array of strings	empty	Your listing IDs or URLs; fills isMineWinning
mySellerIds	array of strings	empty	Your numeric seller IDs; any winning listing of these sellers counts as yours

Pricing

Pay per event: US$0.04 per run (actor-start), then US$0.008 per product checked successfully (product-checked, US$8 per 1,000 products). Products that are blocked, have no winner right now, have a winner without a readable price, or cannot be read are not charged. Residential proxies in each product's country are included, and the run respects the spend limit you set on Apify.

Scenario	Approximate cost
100 products	US$0.84
500 products (the maximum)	US$4.04
500 products every day for a month	~US$121

Run it from code

Replace <YOUR_APIFY_TOKEN> with your token from Apify Console → Settings → API & Integrations.

cURL (waits for the run and returns the items):

curl -X POST "https://api.apify.com/v2/acts/gangary~mercado-libre-buy-box-monitor/run-sync-get-dataset-items" \
  -H "Authorization: Bearer <YOUR_APIFY_TOKEN>" \
  -H "Content-Type: application/json" \
  -d '{"products": ["MLB62391404", "https://www.mercadolibre.com.mx/p/MLM41514595"], "mySellerIds": ["480263032"]}'

Python (pip install apify-client):

from apify_client import ApifyClient

client = ApifyClient("<YOUR_APIFY_TOKEN>")
run = client.actor("gangary~mercado-libre-buy-box-monitor").call(
    run_input={"products": ["MLB62391404", "MLM41514595"], "mySellerIds": ["480263032"]}
)
for item in client.dataset(run["defaultDatasetId"]).iterate_items():
    if item.get("isMineWinning") is False:
        print(item["productId"], "won by", item["winnerSellerName"], item["winnerPrice"])

Node.js (npm install apify-client):

import { ApifyClient } from 'apify-client';

const client = new ApifyClient({ token: '<YOUR_APIFY_TOKEN>' });
const run = await client.actor('gangary~mercado-libre-buy-box-monitor').call({
    products: ['MLB62391404', 'MLM41514595'],
    mySellerIds: ['480263032'],
});
const { items } = await client.dataset(run.defaultDatasetId).listItems();
console.log(items.filter((row) => row.isMineWinning === false));

The synchronous endpoint waits up to 300 seconds; for long lists start the run asynchronously and read the dataset when it finishes.

Integrations

A Buy Box check is worth most when it runs on its own every morning, and Apify does that natively:

• Schedules: run the same product list daily or every few hours.
• Webhooks: call your own endpoint when a run finishes.
• Make, n8n and Zapier: send the rows where isMineWinning is false to Google Sheets, Slack or e-mail.
• Google Drive: drop each run's export into a shared folder.
• Exports: JSON, CSV, Excel, XML or HTML from the dataset, or straight from the API.

Use with AI agents (MCP)

Apify runs a hosted MCP server, so Claude, Cursor, VS Code and other MCP clients can call this actor as a tool. Add this server URL to your client (it signs in with OAuth on first use, or send Authorization: Bearer <YOUR_APIFY_TOKEN>):

https://mcp.apify.com?tools=gangary/mercado-libre-buy-box-monitor

Then ask in plain words, e.g. "For these 30 Mercado Libre catalog products, which ones is seller 480263032 not winning, and who is?" Setup details for each client: Apify MCP server docs.

FAQ

Do I need a Mercado Livre account? No. The actor reads the public product page, the same one a visitor sees. No login, no API key.

How do I find my seller ID? It is the number in your seller profile link, and it also comes back in winnerSellerId the first time you win a product.

What if a product has no winner? Sometimes a catalog product has offers but none is winning at that moment (for example all out of stock). The row comes back as error: "no-winner" and is not charged.

Why are offersCount and minPrice empty in Brazil? Mercado Livre Brazil does not show them to anonymous visitors. The winner and its details are delivered in all five countries.

Why do some products come back blocked? Mercado Libre runs strong anti-bot protection. When a session gets blocked, the actor opens a fresh residential IP in the same country and retries, up to 3 times. If it still fails, you get an error row and no charge. After 5 products in a row are blocked, the actor stops and returns the rest of the list as blocked error rows, also free.

Can I paste a normal listing link? No. Only catalog products (/p/ pages) have a Buy Box. A single-listing link comes back as not-a-catalog-product; use the Price Monitor for those.

Does the actor remember the previous run? No, each run is a fresh snapshot. Schedule it and compare isMineWinning and winnerSellerId between runs, or use the Price Monitor, which keeps history per listing and reports what changed.

Can I cap what a run costs? Yes. The actor respects the Max total charge you set on the run and stops checking products when the limit is reached.

Honest limitations

• The full list of offers of a catalog product (every seller and price) requires a Mercado Livre login. We do not deliver it. You get the winner, the number of offers and the lowest price where the site shows them.
• offersCount and minPrice are null in Brazil, and in the other countries when the page does not show the "other options" block.
• The winner is what an anonymous visitor sees. Logged-in buyers can see a different winner for some products (location, loyalty program).
• Only catalog products have a Buy Box. Listings outside the catalog are not supported here.
• Up to 500 products per run.

Changelog

• 0.1.3 (2026-10-28): first public release, checked on the Apify platform in all five countries.

From the same maker

• Mercado Libre Seller Scraper — every listing of a seller or official store, past the 2,000-result limit.

• Mercado Livre & Mercado Libre Price Monitor — price, stock and changes per listing, with the Buy Box flag.

• Mercado Libre Scraper — Search & Prices (MX, AR, CO, CL) — search results by keyword for the Spanish-speaking sites.

• Mercado Livre Scraper (Brazil) — search results by keyword for Brazil.

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