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MCP servers · Facebook Marketplace (partner) · connector · GPT action

Connect ChatGPT to Facebook Marketplace (partner)

One line gives ChatGPT your Facebook Marketplace (partner) account as tools: 7 endpoints, sellers, items, read catalog, called with your own connection. No key in the prompt, a receipt for every call, revoke ChatGPT's access alone any time.

Get the line for ChatGPTConnect Facebook Marketplace (partner) first

Three steps

  1. Create a free 0n3 account and connect Facebook Marketplace (partner). Paste a key or sign in; it lands in your vault, encrypted.
  2. Install 0n3 into ChatGPT. A custom connector in Developer mode, or an Action on a custom GPT from the OpenAPI spec.
  3. Ask ChatGPT: whoami. Then: "Sellers batch in Facebook Marketplace (partner)".
Custom connector (needs Developer mode)
  1. Settings → Connectors (or Apps) → Advanced → Developer mode on
  2. Create → name 0n3 · MCP server URL https://0n3.app/mcp · Authentication: OAuth
  3. Finish the sign-in with your 0n account
  4. Enable the connector in a chat and ask: "whoami"

ChatGPT connectors cannot send a static header, so 0n3 signs you in through its OAuth door (dynamic client registration is on).

The line above carries a placeholder; 0n3.app/install mints a real key named for ChatGPT and fills it in.

What ChatGPT can then do in Facebook Marketplace (partner)

Sellers · Partner sellers (seller_id, seller_name, ratings) — upload before their items2
Sellers batchPOST /{catalogId}/marketplace_partner_sellers_details
Sellers statusGET /{catalogId}/check_marketplace_partner_sellers_status
Items · Marketplace items via items_batch (PRODUCT_ITEM)2
Items batchPOST /{catalogId}/items_batch
Items statusGET /{catalogId}/check_batch_request_status
Read catalog · The catalog and its products2
Get a catalogGET /{catalogId}
List business catalogsGET /{businessId}/owned_product_catalogs
More · Everything else this app exposes.1
List productsGET /{catalogId}/products

Facebook Marketplace (partner) in other AI clients

Claude Code + Facebook Marketplace (partner)MCP server + skillClaude (desktop & claude.ai) + Facebook Marketplace (partner)connectorCodex CLI + Facebook Marketplace (partner)MCP serverGemini CLI + Facebook Marketplace (partner)MCP serverCursor + Facebook Marketplace (partner)MCP serverVS Code (Copilot) + Facebook Marketplace (partner)MCP serverWindsurf + Facebook Marketplace (partner)MCP server

ChatGPT with other apps

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