MCP SERVERSearch Facebook Marketplace, eBay, Depop and Poshmark for used items in one call, then pull a full listing with photos, description and seller.
LABSCO SUMMARY
The value is the spread: an agent asks the same question of Facebook, eBay, Depop and Poshmark and then opens whichever listing looks right. Each source degrades on its own — missing eBay keys or missing Chrome disables just that marketplace — so a partial setup still returns results. Depop is slower than Facebook and eBay, around 5s per search, because it drives a browser, and Poshmark has no official API behind it.
An MCP server that puts four resale marketplaces behind a single search — Facebook Marketplace, eBay, Depop and Poshmark — with each site's own filters preserved, and a second call that opens any result in full.
Launched over stdio as npx -y secondhand-mcp. Facebook needs nothing at all. eBay needs a free developer account for EBAY_CLIENT_ID and EBAY_CLIENT_SECRET, with EBAY_MARKETPLACE_ID choosing the regional site — EBAY_US by default. Depop and Poshmark drive a headless Chrome; if Chrome or Chromium is not installed they are skipped and the other sources keep working. MARKETPLACES limits which sources are active.
One command — npx -y secondhand-mcp
USE CASES
Search Facebook Marketplace by city with a price ceiling; no account and no browser are involved.
Run the same query across every enabled marketplace, then open the listings worth comparing.
Depop and Poshmark accept sizes and colors, and Poshmark adds brand and department, so the results come back already narrowed.
get_listing_details returns the full description, all the photos, the seller and — on Facebook — the delivery options.
list_marketplaces shows which marketplaces the current configuration enabled, so a missing eBay key or missing Chrome is visible before you search.
Counted once with only startup setup. Other versions, modes or optional credentials may expose a different list.
get_listing_detailsGet full details for a specific listing using an ID from search results. Facebook returns: description, all photos, location, seller name, delivery types, shipping availability. eBay returns: description, all photos, location (city/state/country), seller username, shipping service options. Depop returns: description, all photos, seller username, shipping availability. Poshmark returns: description, all photos, seller username, shipping availability.
list_marketplacesList all available marketplaces and their status
search_marketplaceSearch for items on secondary marketplaces. Supports: facebook, ebay. Returns listing ID, title, price, location, and photo count. Facebook: location-based search, no auth. eBay: keyword search with condition filter, requires API keys. Depop: keyword search with filters for sort, condition, category, brands, sizes, colors (requires Chrome). Poshmark: keyword search with filters for sort, condition, sizes, colors (requires Chrome). Use get_listing_details with a listing ID for full description, all photos, seller info, and shipping options.
BEFORE YOU INSTALL
3 tools when we connected; the project documents 5. The documented search and fetch deep-research pair is absent from the published 0.5.0 package. Without eBay keys and Chrome, search_marketplace reaches only Facebook; list_marketplaces shows which marketplaces are live.
npx on PATH
Both documented clients run the server on your machine.
INSTALLATION
npx -y secondhand-mcp{
"mcpServers": {
"secondhand": {
"command": "npx",
"args": [
"-y",
"secondhand-mcp"
],
"env": {
"EBAY_CLIENT_ID": "<YOUR_EBAY_CLIENT_ID>",
"EBAY_CLIENT_SECRET": "<YOUR_EBAY_CLIENT_SECRET>",
"EBAY_MARKETPLACE_ID": "EBAY_US"
}
}
}
}MCP servers
retailerapi
kapoost
freento
brinzl