0n3
MCP servers · eBay · connector · GPT action

Connect ChatGPT to eBay

One line gives ChatGPT your eBay account as tools: 25 endpoints, inventory, orders, account, 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 eBay first

Three steps

  1. Create a free 0n3 account and connect eBay. 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: "Inventory items in eBay".
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 eBay

Inventory · Inventory items keyed by SKU (the listing's product side)11
Inventory itemsGET /sell/inventory/v1/inventory_item
Inventory itemGET /sell/inventory/v1/inventory_item/{sku}
Put inventory itemPUT /sell/inventory/v1/inventory_item/{sku}
Delete an inventory itemDELETE /sell/inventory/v1/inventory_item/{sku}
OffersGET /sell/inventory/v1/offer
OfferGET /sell/inventory/v1/offer/{offerId}
Create an offerPOST /sell/inventory/v1/offer
Update an offerPUT /sell/inventory/v1/offer/{offerId}
Publish an offerPOST /sell/inventory/v1/offer/{offerId}/publish
Withdraw offerPOST /sell/inventory/v1/offer/{offerId}/withdraw
Merchant locationsGET /sell/inventory/v1/location
Orders · Orders and shipping fulfillment3
OrdersGET /sell/fulfillment/v1/order
OrderGET /sell/fulfillment/v1/order/{orderId}
Ship orderPOST /sell/fulfillment/v1/order/{orderId}/shipping_fulfillment
Account · Business policies and the ship-from location an offer needs3
Fulfillment policiesGET /sell/account/v1/fulfillment_policy
Payment policiesGET /sell/account/v1/payment_policy
Return policiesGET /sell/account/v1/return_policy
Browse · Live listings for comps — keyword or a photo3
Browse searchGET /buy/browse/v1/item_summary/search
Browse search imagePOST /buy/browse/v1/item_summary/search_by_image
Browse itemGET /buy/browse/v1/item/{itemId}
Marketing · Promoted Listings campaigns2
CampaignsGET /sell/marketing/v1/ad_campaign
Create a campaignPOST /sell/marketing/v1/ad_campaign
Finances · What eBay paid out and took2
TransactionsGET /sell/finances/v1/transaction
PayoutsGET /sell/finances/v1/payout

All 25 eBay endpoints →

eBay in other AI clients

Claude Code + eBayMCP server + skillClaude (desktop & claude.ai) + eBayconnectorCodex CLI + eBayMCP serverGemini CLI + eBayMCP serverCursor + eBayMCP serverVS Code (Copilot) + eBayMCP serverWindsurf + eBayMCP server

ChatGPT with other apps

Hostinger363 endpointsTelegram132 endpointsPipedrive95 endpointsResend67 endpointsSquare57 endpointsLinkedIn50 endpointsSlack45 endpointsFigma32 endpointsCloudConvert32 endpointsQuickBooks21 endpointsCloudflare21 endpointsReddit21 endpoints