MercadoLibre & Mercado Livre Price Tracker (5 countries)

US$0.012 per listing checked + US$0.04 per run. Residential proxies in each listing's country are included; blocked pages, unreadable entries and removed listings are never charged.

Monitor up to 1,000 Mercado Livre / Mercado Libre listings in one run and get back, for each one: price, old price, discount, stock, units sold, seller, reputation, Full and free-shipping flags, whether it holds the Buy Box (and who does if it doesn't) and what changed since your last run. Works across Brazil, Mexico, Argentina, Colombia and Chile, mixed in the same list.

• Up to 1,000 listings per run, any mix of the 5 countries, by ID or URL.
• 8 fields compared with your last run (price, old price, stock, status, seller, Buy Box, free shipping, Full), plus previousPrice and priceChange on every row.
• Only-changes mode: schedule it daily and get rows just for the listings that moved.

Built for price-monitoring integrators, repricing tools, brands watching their resellers, and sellers tracking competitors. Paste IDs or URLs, schedule it daily, and ask for only the listings that changed.

Em português: monitore até 1.000 anúncios do Mercado Livre (e do Mercado Libre no México, Argentina, Colômbia e Chile): preço, preço antigo, estoque, vendidos, vendedor, Full, frete grátis, quem ganha o Buy Box e o que mudou desde a última execução.

En español: monitorea hasta 1.000 publicaciones de Mercado Libre: precio, precio anterior, stock, vendidos, vendedor, Full, envío gratis, quién gana el Buy Box y qué cambió desde la última ejecución.

What changed since the last run

This is what the actor is for. Take the listing in the example below (R$ 828 on its first run). If its price drops to R$ 788 and another seller takes the Buy Box before your next run, that run returns the same row with price: 788, previousPrice: 828, priceChange: -40, isBuyBoxWinner: false, the new winner in buyBoxWinnerSellerName and buyBoxWinnerPrice, changed: true and changedFields: ["price", "isBuyBoxWinner"]. With Only return changes on, a listing where none of the 8 tracked fields moved returns no row at all.

What you get

One row per listing. Example from a run on the Apify platform (Mercado Livre Brazil, a listing inside a catalog product, first run). The row is shortened here: it also carries title, url, condition, listingType, sellerId, freeShipping and the other fields in the table below.

{
  "ok": true,
  "itemId": "MLB6791634640",
  "productId": "MLB69797414",
  "country": "BR",
  "price": 828,
  "originalPrice": 1099.9,
  "currency": "BRL",
  "availableQuantity": 2,
  "soldQuantity": 3,
  "status": "active",
  "sellerName": "Minutobaby",
  "sellerReputation": "5_green",
  "isFull": false,
  "isBuyBoxWinner": true,
  "previousPrice": null,
  "priceChange": null,
  "changed": true,
  "changedFields": ["first-seen"],
  "inputValue": "MLB6791634640"
}

On the next run the same listing also comes back with previousPrice and priceChange (for example -40 when the price dropped by 40) and the list of fields that changed.

Field	Meaning
itemId / productId	The listing and, when it belongs to the catalog, the catalog product
price / originalPrice / discountPct	Current list price, crossed-out price and discount % (price is the standard price, before payment-method discounts such as Pix)
availableQuantity	Units in stock. 51 means "+50 available": the site caps the number it shows
soldQuantity	Units sold as the site rounds it (5, 50, 500, 1000, 10000...)
status	active, out_of_stock, paused or not_found (the listing no longer exists)
sellerId / sellerName / sellerReputation / powerSellerStatus	The seller of this listing; reputation looks like 5_green; level is platinum, gold, silver...
isOfficialStore / freeShipping / isFull	Official store, free shipping and Fulfillment (Full) flags
isBuyBoxWinner	true if this listing holds the Buy Box of its catalog product, false if someone else does, null for listings outside the catalog or when Check the Buy Box winner is off
buyBoxWinnerPrice / buyBoxWinnerSellerName	Who is winning that product and at what price
catalogOffersCount / catalogMinPrice	How many new offers the catalog product has and the lowest price (Mexico, Argentina, Colombia and Chile). null in Brazil: the site does not show it to anonymous visitors
previousPrice / priceChange / previousAvailableQuantity	Values from your previous run of the same listing
changed / changedFields	true and the list of fields that changed (price, originalPrice, availableQuantity, status, sellerId, isBuyBoxWinner, freeShipping, isFull). The first time a listing is seen it is changed: true with ["first-seen"]
error rows	{ "ok": false, "error": "...", "inputValue": "..." } for entries that could not be read (blocked, invalid-input, no-price...). They are never charged

What you can paste

One entry per line, any mix of countries:

You paste	What happens
MLB5879370132 or MLB-5879370132	The listing is resolved once (a page load) and remembered in your account, so the next runs read it with a light request. If the ID is actually a catalog product ID (such as MLB62391404), the actor monitors whoever is winning that product
https://produto.mercadolivre.com.br/MLB-5879370132-... / https://articulo.mercadolibre.com.mx/MLM-...	Same as the ID
https://www.mercadolivre.com.br/p/MLB54495903?pdp_filters=item_id:MLB5879370132	A listing inside a catalog product: the cheapest path
https://www.mercadolivre.com.br/p/MLB62391404	A catalog product with no listing: the actor monitors whoever is winning it right now
https://www.mercadolivre.com.br/.../up/MLBU...	A product page that is not in the catalog

Prefixes: MLB Brazil, MLM Mexico, MLA Argentina, MCO Colombia, MLC Chile. Duplicates are removed.

Use cases

• Repricing: feed price, isBuyBoxWinner and buyBoxWinnerPrice into your repricing rules every morning.
• Reseller and MAP watch for brands: list your resellers' listings and get a row whenever one changes price or seller.
• Stock-out alerts: availableQuantity and status (out_of_stock, paused, not_found) tell you when a competitor or reseller runs out.
• Competitor tracking across countries: one list for Brazil, Mexico, Argentina, Colombia and Chile, same fields everywhere.

How to use it

1. Paste your listings into Listings to monitor.
2. Leave Check the Buy Box winner on to see who is winning each catalog product (one extra light request per catalog product, shared between your listings of the same product).
3. Run it. Export to JSON, CSV or Excel, or call it from your own system with the Apify API.
4. To track changes, run it again with the same account. The actor keeps the last values in a key-value store named mercado-libre-price-monitor-state. Turn on Only return changes to get rows just for what moved. If you run it from an Apify task, each task keeps its own history, so two tasks watching the same listing do not overwrite each other. Direct runs of the actor share one history.

Input	Type	Default	Notes
items	array of strings	— (required)	Up to 1,000 IDs or URLs; duplicates removed, entries above 1,000 ignored
checkBuyBox	boolean	true	One extra light request per catalog product, shared by your listings of that product
onlyChanges	boolean	false	Return rows only for listings that changed; every listing is still checked and charged

Pricing

Pay per event: US$0.04 per run (actor-start), then US$0.012 per listing checked successfully (item-checked, US$12 per 1,000 listings). Pages that are blocked, entries that cannot be read, invalid entries, listings that came back without a price and listings that no longer exist (not_found) are not charged. With Only return changes on, every listing is still checked and charged, even when no row comes back, because the page had to be read to know it did not change. Residential proxies in the country of each listing are included, and the run respects the spend limit you set on Apify.

Scenario	Approximate cost
100 listings	US$1.24
1,000 listings (the maximum)	US$12.04
1,000 listings every day for a month	~US$361

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-price-monitor/run-sync-get-dataset-items" \
  -H "Authorization: Bearer <YOUR_APIFY_TOKEN>" \
  -H "Content-Type: application/json" \
  -d '{"items": ["MLB5879370132", "https://www.mercadolivre.com.br/p/MLB62391404"], "checkBuyBox": true, "onlyChanges": false}'

Python (pip install apify-client):

from apify_client import ApifyClient

client = ApifyClient("<YOUR_APIFY_TOKEN>")
run = client.actor("gangary~mercado-libre-price-monitor").call(
    run_input={"items": ["MLB5879370132"], "checkBuyBox": True, "onlyChanges": True}
)
for item in client.dataset(run["defaultDatasetId"]).iterate_items():
    print(item.get("itemId"), item.get("price"), item.get("changedFields"))

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-price-monitor').call({
    items: ['MLB5879370132'],
    checkBuyBox: true,
    onlyChanges: true,
});
const { items } = await client.dataset(run.defaultDatasetId).listItems();
console.log(items.filter((row) => row.changed));

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

Integrations

Daily monitoring is the main use, and it is built into Apify:

• Schedules: run the same list every morning. Save the input as an Apify task and schedule the task, so its change history stays separate from your other lists.
• Webhooks: call your repricing system or alert endpoint when a run finishes.
• Make, n8n and Zapier: send the changed rows to Google Sheets, Slack, e-mail or a database.
• 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-price-monitor

Then ask in plain words, e.g. "Check these 20 Mercado Livre listings and tell me which ones lost the Buy Box and to whom." Setup details for each client: Apify MCP server docs.

FAQ

Do I need a Mercado Livre account or an API key? No. The actor reads the public listing pages, the same ones any visitor sees. No login, no token.

Which price do I get? The listing's standard price. Extra discounts that depend on how the buyer pays (Pix, a specific card) are not applied, so the number is stable from run to run.

Why is availableQuantity 51 and soldQuantity 1000? The site caps stock at "+50 available" and rounds sales to 5, 50, 500, 1000, 10000... The actor returns exactly what the site publishes. Small stocks (1 to 50) and small sales counts come back exact.

What is a Buy Box? For catalog products, Mercado Livre shows one winning offer on the product page. isBuyBoxWinner tells you whether your listing is that offer; buyBoxWinnerSellerName and buyBoxWinnerPrice tell you who is.

What happens when I paste the wrong catalog + listing pair? If the listing does not belong to that catalog product, the site returns a page without price or seller. The actor returns error: "item-not-in-catalog" for that entry and never invents data.

What is a not_found row? The listing was removed or Mercado Livre redirected the ID elsewhere. It is returned (so you notice) with status: "not_found" and is not charged.

Why do some entries 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 the same page, up to 3 times. If it still fails, you get an error row and no charge. After 5 listings in a row are blocked, the actor stops and returns the rest of the list as blocked error rows, also free.

With "Only return changes" on, why am I charged for listings that returned no row? Each listing has to be read to know that it did not change. You pay for the check, not for the row.

Where is the history kept? In a key-value store named mercado-libre-price-monitor-state in your own Apify account. Each Apify task has its own history; direct runs of the actor share one.

Can I cap what a run costs? Yes. The actor respects the Max total charge you set on the run and stops checking listings 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.
• In Brazil, the number of offers and the lowest price are not shown to anonymous visitors: catalogOffersCount and catalogMinPrice are null there. The Buy Box winner is delivered in all five countries.
• Stock is capped at 51 (+50) and sales are rounded by the site.
• The first time an ID is seen (not a URL) the actor has to resolve it with an extra page load, which is slower and uses more proxy traffic. The next runs reuse the remembered address.
• Listing status paused and out_of_stock are read from the page; a paused listing is often redirected by the site to another product, in which case it comes back as not_found.
• Up to 1,000 listings per run. For more, split the list across runs.

Changelog

• 0.1.3 (2026-10-28): first public release. Bare listing IDs resolve with a light request; a pasted catalog ID monitors whoever is winning that product.

From the same maker

• Mercado Libre Buy Box Monitor — who wins the Buy Box on each catalog product, and whether it is you.

• Mercado Libre Seller Scraper — every listing of a seller or official store, to build the list you monitor here.

• 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.

• Mercado Libre Product & Reviews Scraper — full product page data plus customer reviews.

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