Show HN: Facebook Marketplace MCP

An MCP server that provides access to Facebook Marketplace via direct GraphQL API calls. No browser automation at runtime — speaks Facebook's internal protocol directly. Facebook's web client makes all Marketplace requests as POST /api/graphql/ with a doc_id (query hash) and variables . This server replays those requests using your existing Facebook session cookies from Chrome. Think of it like pypush for iMessage — direct protocol, no browser. - macOS (cookie extraction uses Keychain) - Google Chrome with an active Facebook login - Node.js 20+ git clone cd facebook-marketplace-mcp npm install npm run build claude mcp add facebook-marketplace -- node /path/to/facebook-marketplace-mcp/dist/index.js Or add to your Claude Code config manually: { "mcpServers": { "facebook-marketplace": { "command": "node", "args": ["/path/to/facebook-marketplace-mcp/dist/index.js"], "env": { "CHROME_PROFILE": "Default" } } } } Search Marketplace by query, location, and filters. | Parameter | Type | Required | Description | |---|---|---|---| query | string | yes | Search term | latitude | number | yes | Latitude of search center | longitude | number | yes | Longitude of search center | radius_km | number | no | Search radius (default: 50) | min_price | number | no | Min price in dollars | max_price | number | no | Max price in dollars | category | string | no | Category ID | limit | number | no | Max results (default: 20) | Get full details for a specific listing. | Parameter | Type | Required | Description | |---|---|---|---| listing_id | string | yes | Marketplace listing ID | Save a search as a monitor to track new listings over time. | Parameter | Type | Required | Description | |---|---|---|---| name | string | yes | Monitor name | query | string | yes | Search term | latitude | number | yes | Search center lat | longitude | number | yes | Search center lng | radius_km | number | no | Radius (default: 50) | min_price | number | no | Min price | max_price | number | no | Max price | Check monitors for new listings since last check. | Parameter | Type | Required | Description | |---|---|---|---| monitor_name | string | no | Check specific monitor, or omit for all | List all saved monitors. Delete a saved monitor. | Env Variable | Default | Description | |---|---|---| CHROME_PROFILE | Default | Chrome profile directory name | Facebook rotates their doc_id values on deploys. If searches stop working: npm install -D playwright npx playwright install chromium npm run capture-queries This opens a browser, navigates Marketplace, and captures current query IDs. Update src/facebook/queries.ts with the new values. The server self-rate-limits to 3 requests/minute with random jitter to avoid detection. This means searches take a few seconds. - macOS only for automatic cookie extraction - Requires Chrome with active Facebook session - Facebook ToS — automating Facebook violates their Terms of Service - Fragile — doc_id values change on Facebook deploys - Rate limited — aggressive use may trigger CAPTCHAs or account flags - No write operations — search/read only, no messaging or listing creation