Secondhand MCP

AModel Context Protocol(MCP) server that lets AI assistants search secondhand marketplaces. Search Facebook Marketplace, eBay, Depop, and Poshmark for used and secondhand items — filter by price, category, condition, size, and color, then get full listing details with photos, descriptions, and seller info.

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{ "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" } } } }

{ "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" } } } }

eBay, Depop, and Poshmark are all optional — if eBay API keys are missing or Chrome isn't installed, those marketplaces are automatically disabled and the rest still work.

Depop & Poshmark / Chrome Requirement

Depop and Poshmark require a headless browser. IfGoogle Chrome or Chromiumis installed on your system, both are automatically enabled — no config needed. If Chrome isn't found, they are silently skipped.

On macOS, the first time you search Depop or Poshmark, you may see a system prompt asking to allow Node.js to control Chrome. This is expected — puppeteer needs to launch Chrome in headless mode. Allow it once and it won't ask again.

The browser runs invisibly in the background and only launches when you actually search Depop or Poshmark.

By default all marketplaces are enabled. To limit which are active, set theMARKETPLACESenv var (comma-separated):

{ "env": { "MARKETPLACES": "facebook,ebay" } }

Valid values:facebook,ebay,depop,poshmark

eBay uses the officialBrowse API. You need a free eBay developer account:
- Create an account atdeveloper.ebay.com
- Create an application to get a Client ID and Client Secret
- Add them to your MCP config asEBAY_CLIENT_IDandEBAY_CLIENT_SECRET

{ "env": { "EBAY_MARKETPLACE_ID": "EBAY_DE" } }

The full list is available in theeBay API docs.

Convenience pair following theChatGPT Deep Research tool contract— exact names, a single string argument each:

- search(query)— searches every enabled marketplace at once and returns{ results: [{ id, title, text, url }] }, whereidismarketplace:listingId
- fetch(id)— returns full listing details for asearchresult ID as{ id, title, text, url, metadata }

Useful for research-style clients that expect these standard tool names; for filtered searches usesearch_marketplace.

Facebook Marketplace— Searches listings by location, price, and query. Resolves city names to coordinates. No login or browser needed.

eBay— Uses the official eBay Browse API with OAuth 2.0 client credentials. Tokens are cached and auto-refreshed. The target regional marketplace is controlled byEBAY_MARKETPLACE_ID(default:EBAY_US).

Depop— Uses a headless browser to search listings with support for category, condition, size, and color filters. The browser instance is shared across requests.

Poshmark— Uses a headless browser to search listings with support for condition, size, color, sort, and price filters. Poshmark is not location-based — all items ship nationally.

git clone https://github.com/jlsookiki/secondhand-mcp.git cd secondhand-mcp npm install npm run build

- Create a new file insrc/marketplaces/
- ExtendBaseMarketplaceand implementsearch()and optionallygetListingDetails()
- Add the constructor toallMarketplacesinsrc/marketplaces/index.ts

- Facebook: May break if Facebook changes their frontend
- eBay: Requires developer API keys (free tier available)
- Depop: Requires Chrome/Chromium installed; slower than Facebook/eBay (~5s per search)
- Poshmark: Requires Chrome/Chromium installed; no official API so relies on page scraping
- Rate limiting: Don't make too many requests too quickly

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